Global Carrier 56 Modem User’s Guide 0049-2200-001 Rev.
The products and programs described in this User’s Guide are licensed products of Telenetics Corporation. This User’s Guide contains proprietary information protected by copyright, and this User’s Guide and all accompanying hardware and documentation are copyrighted.
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Contents Introduction .................................................................................................................................... 8 Installation ...................................................................................................................................... 9 Unpacking Your Hardware ..................................................................................................... 9 Additional Items You Need ...................................................
ATX Extended Response Codes ........................................................................................ 106 ATZn Restore Configuration Profile .................................................................................... 108 AT&B Character Length ...................................................................................................... 109 AT&C Controlling Data Carrier Detect .................................................................................
AT%T DCD Override ........................................................................................................... 164 AT%U V.42 Response Codes ............................................................................................. 165 AT%W Welcome Message ................................................................................................. 166 AT\A MNP Block Size ...........................................................................................................
ATS30 Inactivity Timer ........................................................................................................ 224 ATS33 EQM Threshold Value .............................................................................................. 226 ATS38 Disconnect Delay .................................................................................................... 227 ATS42 Modem Disconnect Reason ....................................................................................
Introduction Welcome to the Global Carrier 56 User Guide, a comprehensive guide to the efficient use of your modem. Together with the Read Me First Guide supplied with your modem, this reference manual provides all the information needed to make maximum use of your equipment and software. The Global Carrier 56 User Guide is divided into the following sections: Getting Started ❏ A complete description about how to get started using your equipment, including basic details and more advanced topics.
Installation Installation Unpacking Your Hardware Your package should include: • The Global Carrier 56 modem • An RJ-11 telephone-line cable • A power supply module • A DTE DB25 data cable • This User’s Guide If your package contents are damaged or missing, please contact your place of purchase immediately.
Hardware Overview Back View The following figure shows the back view of the Global Carrier 56 modem. Starting from the left side, this view shows: • A line jack for connecting the modem to the communications line. • An audio jack for leased-line operation. • A female, 25-pin RS-232 connector for connecting a standard DTE (RTU). • A power connector. • An ON/OFF switch.
Installation Installation Summary The modem installation involves the following steps: 1. Finding a suitable location for the modem. See the section below. 2. Making the necessary modem connections. See page 12. 3. Installing the modem driver. See page 13. Finding a Suitable Location The location you select for your modem should provide easy access to the back panel communications interfaces and provide a clear view of the front panel LED indicators.
Connecting the Cables 1. Turn off your computer. 2. Plug the data cable's male end (pins showing) into the connector marked RS232 at the back of your Modem and then plug the female end (no pins showing) of the same cable into the COM port at the back of your computer. 3. Your computer's COM port could be 9 pins or 25 pins. Use the appropriate connector on the cable suppled to conntect your Modem to your Serial port. 4.
Installation Driver Installation Windows 2000 1. Windows will detect the modem automatically. Please insert the Telenetics CD supplied and click "Next". 2. Select "Search for a suitable driver for my device [recommended]", and then click "Next". 3. Select "Specify a location" and click "Next". 4. Enter the driver location "D:\" where D:\ is the letter of your CD ROM drive and click on "OK". 5. Windows will find the correct driver for your modem. Click "Next" to continue. 6.
Modem LED Display ☞ When your modem is using V.90, the Front Panel Mode LEDs will display the speed closest to the K56flex speed. Transmit Data (TXD) LED will flash when the modem is sending data. Receive Data (RXD) LED will flash when the modem is transferring data from the remote to the local computer. Off-Hook LED will glow when the modem is on-line; ie. dialling or answering Carrier Detect LED will glow when the modem detects a valid carrier signal from a remote modem.
Installation Front Panel Mode LEDs Line Modulation One Two Three Four K56flex 56000 bps K56flex 54000 bps K56flex 52000 bps K56flex 50000 bps K56flex 48000 bps K56flex 46000 bps K56flex 44000 bps K56flex 42000 bps K56flex 40000 bps K56flex 38000 bps K56flex 36000 bps K56flex 34000 bps K56flex 32000 bps K56flex 30000 bps 33600 bps 31200 bps 28800 bps 26400 bps 24000 bps 21600 bps 19200 bps 16800 bps 14400 bps 12000 bps 9600 bps 7200 bps 4800 bps 2400 bps 1200 bps 1200/75 bps 300 bps Fax 14400 bps Fax 9
The AT Commands The AT commands are a group of special commands recognised by your modem. These commands derive their name from the letters AT, which are used to prefix commands. Before continuing: • Run your communications software and enter local mode (or terminal mode) at 38,400 bps Refer to your communication software manual for details. The Attention Code An AT (sometimes known as the ATtention code) usually precedes all commands being sent to the modem.
AT Commands • Type: AT&T1 The modem will enter on-line state (this command actually causes the modem to enter test mode, but is equivalent to entering on-line state). Now try to view the modem’s firmware identity code: • Type: ATI9 Your command will be ignored. This is because the modem assumes you are typing characters to be sent to a remote system. Now enter an escape sequence. Do not type any characters for one second, type +++ rapidly and wait another full second.
Response Codes Your modem is capable of telling you, with on screen messages, what it is doing. These messages are known response codes or result codes, and you will see them from time to time. For example: After a command is successfully executed, the response is: OK After a connection is established, the response is: CONNECT A complete list of Response Codes can be found in Appendix A. Dialling The AT commands may be used to initiate dialling with the modem.
AT Commands Dial Modifiers Dial modifiers are characters than can be included in a phone number to make the modem perform special tasks while dialling. For example, not all modem users will be using a dedicated telephone line. Some users will have their modems connected to PABXs. To allow users of PABXs to operate their modems successfully, dial modifiers are supported on the modem.
Hanging Up The H command is used to hang up the modem. After you have finished communicating with another computer you must hang up your modem. Similarly, you must hang up the phone after calling another person. If you don’t, no one will be able to call you and you may even be charged for the length of time the phone was off the hook. To hang up your modem: • Type: ATH The modem will return an OK response message.
AT Commands Your modem is pre-configured to automatically answer any incoming call, provided it is switched on, is in local command state, DTR is high and is not performing a test. If you receive a call on the phone line the modem is connected to, it will answer the call and attempt to connect to the calling modem. S Register 0 contains the number of rings the modem will wait before answering a call.
Selecting Speeds The following section describes how to select line and terminal speeds for your modem. Terminal Speeds Your modem has the ability to communicate with your computer at various speeds. The modem offers two speed modes: variable speed mode and constant speed mode.
AT Commands Setting Terminal Speeds Your modem can sense the terminal speed of the computer and automatically change its terminal speed to match. This is known as ‘auto bauding’, and is done each time an AT command is issued to the modem. Your modem can auto baud at 300 bps through 9600 bps, 14,400 bps, 19,200 bps, 38,400 bps, 57,600 bps and 115,200 bps. The R command may also be used to disable autobauding and lock the terminal speed. Refer to the R command for available speeds.
Example 2 - Dialling other modems at 19,200 bps (V.34 or V.FC) B Command Setting: B18 Terminal Speed: 57,600 bps Flow Control: On (&K3 for RTS/CTS flow control) You may use this arrangement when dialling online information services or bulletin boards. With these settings, you modem will attempt to connect at 19,200 bps, but may change the line speed if the quality of the telephone line does not support this speed. Example 3 - Dialling information services at 1200 bps (or V.
AT Commands Example 3 - Answering incoming calls B Command Setting: B9 Terminal Speed: 38,400 bps Flow Control: On (&K3 for RTS/CTS flow control) If you wish your modem to answer incoming calls, use these settings. This will allow your modem to connect at any speed between 14,400 bps and 300 bps.
Flow Control Your modem supports RTS/CTS, XON/XOFF and Transparent XON/OFF flow control. Flow control ensures that data is not lost between your computer and your modem. Flow control will be ignored when your modem is configured for variable speed mode (AT\N1) or is in local command state. RTS/CTS Flow Control RTS/CTS flow control takes place when the modem and computer manipulate the CTS (Clear To Send) and RTS (Request To Send) signals to stop and start data flow.
AT Commands Transparent XON/XOFF flow control is selected by issuing the &K5 command. Failsafe Flow Control Failsafe flow control is designed specifically for UNIX computers running the UUCP file transfer protocol. This form of flow control only affects data being transmitted from the computer to the modem. When the modem’s data buffer approaches maximum capacity, the modem will lower the CTS signal.
Configuring the Modem Your modem allows you to tailor its operating parameters to suit your own particular requirements. The modem uses S Registers to alter the configuration profile. Each S Register contains a decimal value to represent a time delay, an ASCII character or the number of times the phone should ring before the modem answers it (the interpretation of each value differs with each S Register).
AT Commands Error Correction Error Correction Protocols This section examines the error correction and data compression features of your modem. The modem offers both V.42 (LAP-M) and MNP® (Microcom Networking Protocol™) error correction protocols. These protocols allow data errors to be detected by the receiving modem, provide flow control between remote systems and improve the overall throughput of data transfers. Your modem also supports V.42bis and MNP5 data compression. V.
Data Compression Two forms of data compression are supported by your modem; V.42bis and MNP 5. V.42bis is based on the Lempel-Ziv compression technique (similar to the techniques used by PC compression programs) and can work with both V.42 and MNP. V.42bis is very good at compressing data that has repetitions of sequences of characters. For example, in an English sentence there are usually repetitions of ‘ions’ or ‘ings’ or ‘ere’; V.
AT Commands variable speed mode. \N3 selects V.42/MNP auto-reliable mode and \N5 selects V.42-only autoreliable mode. Your modem supports special CONNECT messages for connections made with either reliable or auto-reliable modes. When the AT\V1 command is issued and your modem connects in either reliable or auto-reliable mode, a response message will be sent to your computer.
when operating with poor line quality. If the telephone line drops out, MNP 10 will attempt to reconnect up to the maximum time permitted by your country’s telecommunications rules. Thus, if there is a short line drop-out, MNP 10 will provide minimal interruption whereas other modems will disconnect entirely. MNP is the only type of error correction allowed with MNP 10 and is only available when connected to another modem that supports MNP 10. The #K command is used to select MNP 10.
AT Commands Increasing Data Throughput with Error Correction & Data Compression Data throughput refers to the amount of data being transferred. Error correction and data compression allow you to increase data throughput in comparison to if error correction and data compression were not selected.
Security & Encryption Your modem has many sophisticated security features. Your modem limits caller access by means of user names and passwords. User names and passwords are stored in the modem’s nonvolatile memory. With each user name and password a modem command of up to 30 characters may be specified. This allows the implementation of callback to users. Callback is where the modem rings a specified phone number.
AT Commands Adding and Changing Users Your modem allows you to add new users and change existing users. Selecting option 2 on the Security Menu will result in a prompt: Enter Name: To add a new user: • Type in the name of the new user User names must not be longer than 30 characters. They are NOT case sensitive.
If you do not enter a command you will be given the option of entering a SuperSecure DES Key for the user. To use this feature refer to the ‘SuperSecure Advanced Security Mode’ or else press ENTER to go on to the next user. Removing Users Your modem allows you to remove individual users or all the users currently stored in your modem. To remove an individual user: • Select option 2 from the Security Menu You will be prompted to enter a new user name.
AT Commands attempt was made to connect with that user name. You should regularly check the number of successful and unsuccessful attempts to connect to your modem. • Select option 4 to view the access record An unusually high number of unsuccessful attempts to connect with a particular user name may indicate someone is trying to violate your modem’s security.
Callback Security As mentioned earlier, your modem allows you to specify a modem command with every user name and password. This feature allows you to implement modem callback. Callback means that after a caller has successfully connected, your modem will hang up and then dial the caller. Even if an unauthorised caller successfully connects to your modem, that caller will have to be using the phone line which your modem is going to call back. Three commands are required to implement callback.
AT Commands Your modem will issue an OK message. You will be returned to local command state. Downloading the Security File Selecting option ‘D’ from the security menu will enable a dump of the security database to your computer for storage or editing. You will be asked to type ‘Y’ to start the download. The file format is: “”, “”, “”, nnn, mmm CR LF where nnn and mmm are the 3 digit Granted and Denied Access Counts and CR and LF are Carriage Return and Line Feed.
and always keep a copy of the unmodified download file. Integrating Caller ID into the Security Database • Enter the Security Menu by typing AT#S. You will then be presented with a request for a Password. If you have not specified a password then key ENTER, else type in the password. The Caller ID status is displayed at the bottom of the Security Menu. If Caller ID is enabled you have the choice of Excluding Callers who are unknown and Accepting Callers who are unknown by using the ‘T’ command.
AT Commands Encryption Your modem supports Data Encryption Standard (DES) encryption. DES encryption allows you to encrypt data being passed to a remote modem. The remote modem must support Cipher Feedback (or CFB) DES encryption in order to decrypt the data sent from your modem. The #E1 command is used to enable DES encryption. The modem requires you to enter an encryption Key and an Initial Value. These are two 16-character hexadecimal numbers.
☞ For countries other than Australia, DES encryption is only available to end users who meet the security requirements of the Australian Department of Defence. Contact your modem supplier for details of making application for a DES equipped modem to be supplied to you. DES Multikey DES Multikey allows the answering modem to establish which primary keys the originating modem is using and then automatically switch to that key. • The originating modem uses AT*K to select the current Key and Initial Value.
AT Commands Entering a Key for Each User • Enter AT#E2 to enable SuperSecure mode • Select the security menu using AT#S • Enter the security password to gain access to the security menu • Set up the modem’s primary DES KEY and Initial Value (IV) as per standard DES setup • Select Option 2 to add new users • Enter the username • Enter the password to be used by your modem (not necessarily the same as the password on the modem you are going to dial) ☞ Do not use a / character in any password, be
Accessing a System Using SuperSecure If both your modem and the remote modem have been correctly setup you can: q Dial the remote system. ❑ The modems will connect and enter security dialog mode using the modem’s primary key. ❑ This key must be the same for both modems.
AT Commands • ‘Fudge’ is Mark Stein’s password on the remote system • ‘Vanilla’ is the password on the local modem • ‘Access granted’ confirms that the passwords are correct • Secondary keys mismatch if the secondary KEY, IV or KE are different Enabling Rotating Secondary Keys ❑ If you enter a KE of 00 for the user, then the secondary key will remain the same for each connection.
Entering a Password in the Remote Modem’s Database When connected in SuperSecure, you may change your password.
AT Commands ❑ The record format is: aaa, “”, “”, “”, “bbb,ccc,ddd,eee,fff,ggg”, “”, “ IV”, “”CR,LF • aaa is 3 digit control number • bbb is 3 digit access granted count • ccc is 3 digit access denied count • ddd is 3 digit days since password change • eee is 3 digit reserved • fff is 3 digit reserved • ggg is 3 digit reserved ☞ The control number should not be touched on existing users.
Dial Stored Phone Numbers Only Option Option ‘M’ is similar to Option ‘K’ but restricts the modem to dialling only those numbers listed in the stored phone number fields as set with the &Z command. The stored numbers must then be dialed using the ATDS=X command where X is the position of the stored number as set with the AT&Z command. New stored numbers cannot be added by the user once the dial restriction has been enabled.
AT Commands Synchronous Modes This section explains the use of your modem in synchronous modes. A dumb mode or manual mode allows some of the functions of your modem to be accessed via the front panel switches. Some of the information in this section assumes you have read the Getting Started Section. Your modem offers two synchronous modes, conforming to the Hayes modem synchronous modes 1 and 2.
Synchronous Mode 1 Your modem is capable of dialling remote systems in asynchronous mode and then automatically switching to synchronous mode once connection has been made. If the connection is lost, your modem will hang up and return to asynchronous local command state.
AT Commands ☞ Data should only be transmitted once DCD, DTR and CTS have been asserted. Your computer should not assume that if CTS is asserted then it is safe to begin transmitting data — your modem will keep CTS asserted whenever it is in local command state. Hanging Up Your modem will hang up and return to asynchronous mode if carrier is lost for longer than the period defined by S Register 10 or if DTR is lowered after the &D2 command has been issued.
Dialling Dialling will commence as soon as the DTR signal is asserted (an OFF-ON transition occurs). Your modem will not generate response codes when synchronous mode 2 is selected. All call progress is indicated by your modem’s speaker (the M command controls the operation of your modem’s speaker). As soon as your modem connects to a remote modem it will assert the DSR and DCD signals.
AT Commands Leased Line Operations A leased line, or private line, is a telephone line that permanently connects two or more locations. The leased line does not have any switching equipment associated with it. Leased-line operation with the modem is selected with the &L command. The &L command informs your modem that communications will occur over leased lines, with no answer tones being generated by the modem.
☞ Your modem will hang up and return to local command state if your computer transmits characters while the modem is attempting to establish or re-establish a connection (unless &N0 has been issued). Auto Leased Line Operation (&L2 or &L3) You can select Auto leased line operation with the &L2 or &L3 command. In Auto leased line operation you do not need to issue the ATA command to answer a call, or the ATD command to initiate a call.
AT Commands 4 Wire Leased Line setup via audio port Your Global Carrier 56 has been supplied with an audio port which enables you to setup 4 Wire Leased Line: 1. Connect Leased Line cable (Pins 1 and 4 for TX / 2 and 3 for RX) to the Audio ports on your Global Carrier. 2. Issue the following commands through HyperTerminal to activate the Audio port: AT&F AT-LINE=1 (Reset) (Set audio port active) 3. Issue the following commands to activate Leased Line mode: a.
Dumb Mode Operation Your modem has two methods of operating with your computer. The commonly used method is “smart mode”, where the computer issues “AT” commands to the modem to make it dial and hang up For computers which do not offer an asynchronous port or cannot communicate synchronously using V.25bis commands, dumb mode permits manual control of your modem.
AT Commands Refer to the mode table at the beginning of the User Guide - it shows the meaning of each combination of the Mode LEDs.
• Place front panel Option switch 4 in the Down position (select Dumb mode) • Place front panel Option switch 6 in the Down position (select Originate mode) • Place front panel Option switch 3 in the Down position (disable autoanswering) ☞ Your modem cannot dial if auto-answer is enabled. • If necessary, use the Mode button to select the required communication speed The connection speed of the modem is indicated by the Mode LEDs..
AT Commands • Type: AT&W The modem set up is saved. • Place front panel Option switch 4 in the Down position (select Dumb mode) • Place front panel Option switch 6 in the Down position (select Originate mode) • Place front panel Option switch 3 in the Down position (disable autoanswering) ☞ Your modem cannot dial if auto-answer is enabled. • If necessary, use the Mode button to select the required communication speed The connection speed of the modem is indicated by the Mode LEDs.
The connection speed of the modem is indicated by the Mode LEDs. Refer to the Modem LED Display table; it shows the meaning of each combination of Mode LEDs. • Press the Talk/Data button to Data (this button is located next to the front panel Option switches) • Raise the DTR signal on your computer DTR must change from “low” to “high” to commence dialling. Your modem dials the stored telephone number zero. The OH and CD LEDs glow when the modem connects.
AT Commands Manual Answering For reasons of data security, it may be desirable to verbally identify a caller before allowing connection to your computer. A telephone handset must be connected to the same telephone line as your modem to permit manual answering.
The Option Switches The Option switches allow you to control the operation of your modem in Dumb mode, as well as providing additional features in Smart mode. For users of modems with front panel Option switches only • Front panel Option switches 1 and 2 always take precedence over software setting of behaviour of DTR and DSR. When AT%F is set to 1 (when AT%F is set to 0, behaviour of DTR and DSR is controlled by AT commands if applicable). Switches 1 and 2 are used to select AT command mode or V.
AT Commands V.25bis Operations V.25bis is a modem command set like the AT command set, which allows you to control your modem. However, V.25bis commands may be issued to the modem in asynchronous or synchronous mode (AT commands may only be issued when the modem is operating in asynchronous mode). This means V.25bis is suitable for mainframe and minicomputers which only support synchronous communications ports. The implementation of V.25bis supported by your modem is based upon the 1988 revision of the V.
Overridden Settings Almost all AT commands and S Registers stored before entering V.25bis mode will have effect except for the following commands. AT Command V.25bis Operation &D Will act as if &D2 is selected S0 Will act as if S0=1 These override settings are not stored in your modem’s non-volatile memory; they are active only while V.25bis command mode is active. If you issue the &V command to view the modem’s configuration the original settings will be displayed. V.25bis Commands Six V.
AT Commands V.25bis Indications V.25bis indications are similar to the response codes, sent when your modem is operating in AT command mode. Six V.25bis indications are supported by your modem: Verbal Meaning VAL Command accepted and executed CNX Connection established INC Incoming call detected CFI AB Call failure, abort CFI ET Call failure, engaged INV Invalid command These are the only indications supported by your modem. When operating in asynchronous V.
Most PABXs require you to dial 0 or 9 (in order to obtain an outside line) and wait for a dial tone before dialling the actual phone number. Using dial modifiers, you can successfully dial the phone number 12345 through a PABX using the command: • Type: CRN 0<12345 The < dial modifier causes the modem to pause for a short time after dialling 0. This allows most PABXs sufficient time to obtain a line before dialling. The factory default delay for the < modifier is two seconds.
AT Commands Direct Dialling Direct dialling refers to your modem’s ability to dial a stored phone number when the DTR signal of your computer is raised. This form of dialling is particularly suited to synchronous computers and is referred in other parts of this guide as ‘DTR Dialling’. ☞ The &M command (used to select various methods of DTR dialling in AT command mode) has no effect when the mode is operating in V.25bis command mode.
☞ If you issue the DIC command but then want to answer the call, issue the CIC command. The CIC command will cause your modem to answer a call after theDIC command has been issued. The modem will then go on line, transmit an answer tone, and attempt to connect to the calling modem using the communications standard selected by the B command. As soon as a connection is established, the modem will send a CNX message to your computer and enter on-line state in answer mode.
AT Commands Modem Cable In order to operate correctly, your modem cable must support the following signals: DB25 Pin Signal 2 Transmit Data (TxD) 3 Receive Data (RxD) 4 Request to Send (RTS) 5 Clear to Send (CTS) 6 Data Set Ready (DSR) 7 Signal Ground 8 Data Carrier Detect (DCD) 15 Transmit Clock (TxC)† 17 Receive Clock (RxC)† 20 Data Terminal Ready (DTR) 22 Ring Indicator (RI) 24 External Clock (XCLK)† † - Not required for asynchronous operation Synchronous Character Encoding Yo
HDLC Notes Commands must be correctly framed to be accepted by the modem. The address field must be FF, the control field must be 03 (hex) or 13 (hex) or a bad FCS field or an abort is received. If a succession of V.25bis indications are to be sent to your computer, the poll bit (or final bit) will be set to zero for all but the last V.25bis indication, to signify that more V.25bis indications follow. Control characters that do not form part of the frame are treated as a normal characters.
AT Commands Distinctive Ring The modem is able to discriminate between three different types of rings. This is useful if you purchase the Telstra Duet service. With Telstra Duet, two phone numbers are shared for one telephone line. One is for voice and the second is for your modem. To enable the modem to answer only when your modem number is dialed, issue the command: AT-SDR=4 S0=2 (This can be saved with AT&W). For most users, AT-SDR=4 will be suitable.
Caller ID The Global Carrier 56 has enhanced Caller ID functions integrated with its security system. The user can set up the modem to display the number of all inbound calls and selectively answer or not answer the call depending on whether the caller is known. The modem can also be programmed to play a unique ‘tune’ if the caller is known. Enabling the Caller ID Function The user enables Caller ID by entering AT#CID1 (or AT#CID=1). It is off by default (AT#CID0).
AT Commands REASON NO NAME = where message is ‘Out Of Area’ or ‘Private’ is displayed if the network does not provide a name QUAL = Long Distance is displayed if the call is long distance REDIRECT = where message can be ‘Call Forward’ or ‘Call Forward: First Number Busy’ or ‘Call Forward: First Number Didn’t Answer’ if the call has been re-directed from another number. LOOKUP NAME = ttt..ttt where ttt...ttt is the name looked up by the modem in its security database.
You will then be prompted for another name. When you are finished entering names. Key ENTER to return to the Security Menu. You may display the users in the database by selecting the ‘1’ command. Caller ID entries are distinguished from DIAL BACK security entries by the lack of valid AT commands in the Command field. Distinctive Ringing ‘Tune’ Option You may enable a feature to identify a caller by playing a unique tune for each caller on each ring. Enter #MUS1 to turn on this feature.
AT Commands Call Logging The Global Carrier 56 now includes a Call Logging Function. This function will automatically record the Date, Time, Phone Number and Name of any inbound call that has Caller ID information. In addition the modem will also log all outbound calls that are originated by the modem and record the phone number, connect speed, disconnect reason and call duration. The modem will also log information about anonymous inbound calls if the call makes a data or fax connection.
Commands +++ Escape Sequence When the modem is in on-line-state, issuing an escape sequence will force it to return it to online command state, without disconnecting. Unlike other commands, you should not type AT before the escape sequence, nor type a carriage return after it. Instead, wait a full second before you type the escape sequence and then a full second after typing it.
AT Commands **** Remote Access Sequence When the modem is connected to a remote modem and is in on-line state, the remote modem may type this command to force the modem to enter Remote Access mode. Remote Access mode simply means the remote modem will be able to issue AT commands to your modem, just as if you were typing them at your computer keyboard. Remote Access mode may be switched on or off with the #A command. Remote Access mode is password protected by default.
Options **** Request remote access See Also #A command Universal Remote Access S Register 66 Remote Access Guard Time S Register 67 Remote Access Character Page 78
AT Commands AT? Interactive Command Help Your modem will display information about the AT commands it supports if you type a question mark (?) in your AT command. You can view the modem help as ‘pages’ of information. This allows you to read the information at your own pace. Press the Spacebar to view the next help page, Backspace or Delete to view the previous page, or ENTER to quit from the help pages. You may also search for certain commands or words.
A/ Repeat Last Command This command orders the modem to re-execute the last command you entered. Unlike other commands, the Repeat Last Command should not be preceded by an AT, nor followed by a carriage return. This command must be typed on one line by itself.
AT Commands ATA Answer This command enables you to answer an incoming call manually. On receiving an incoming call, the modem will send a RING message code to your computer. When you see the ring message: • Type: ATA Your modem will send an answer tone to the calling (originating) modem and wait to receive a carrier signal in return. The B command selects which communication standards your modem will attempt to connect to.
ATBn Select Communications Standard Your modem is capable of connecting to remote systems using a variety of communications standards. This command enables you to select the communications standards you want to use. The performance of V.90 and K56flex are very similar. The main difference is the connect speeds available for K56flex and V.90. The following speeds are available when your modem is using V.90: Command Speed B0 ■ Auto-Connect B1 Auto-Connect B2 Auto-Connect B3 V.
AT Commands B30 V.34 at 9600bps B31 V.34 at 12,000bps B40 V.90 at 28,000bps B41 V.90 at 29,333bps B42 V.90 at 30,667bps B43 V.90 at 32,000bps B44 V.90 at 33,333bps B45 V.90 at 34,667bps B46 V.90 at 36,000bps B47 V.90 at 37,333bps B48 V.90 at 38,667bps B49 V.90 at 40,000bps B50 V.90 at 41,333bps B51 V.90 at 42,667bps B52 V.90 at 44,000bps B53 V.90 at 43,333bps B54 V.90 at 46,667bps B55 V.90 at 48,000bps B56 V.90 at 49,333bps B57 V.90 at 50,667bps B58 V.
B11 V.32 at 7200bps B12 V.32 (Non-TCM) at 9600bps B13 V.32 at 9600bps B14 V.32bis at 12000bps B15 V.32bis at 14400bps B16 V.34 at 14,400bps B17 V.34 at 16,800 bps B18 V.34 at 19,200 bps B19 V.34 at 21,600 bps B20 V.34 at 24,000 bps B21 V.34 at 26,400 bps B22 V.34 at 28,800 bps B23 31,200 bps B24 33,600 bps B25 (Reserved) B26 (Reserved) B27 V.34 at 2400bps B28 V.34 at 4800bps B29 V.34 at 7200bps B30 V.34 at 9600bps B31 V.
AT Commands See Also A Command Answer B Command Select Communication Standard D Command Dial +MS Command Page 85
ATD Dial This command allows you to dial a telephone number. The basic dialling command is: ATD followed by the telephone number. For example: To dial the number (09) 111-1234 • Type: ATD091111234 You can use hyphens, spaces or parentheses. They will be ignored by the modem, but they will make it easier to read the command line. For example: ATD (09) 111-1234 ☞ The D command must be the final command on a command line, unless you use the ; dial modifier.
AT Commands Dial Modifiers Dial modifiers enable you to change the characteristics of dialling. (Definitions for all modifiers appear on the following pages.
; return to local command state This modifier orders the modem to return to local command state — without disconnecting — after it has dialed the number. You may use this modifier to communicate with a mainframe computer using security callback. Your modem dials the number of the mainframe computer and then immediately returns to local command state. Another ATD command can then be used to generate the tones required for the callback identity number.
AT Commands For example: To tone dial a remote database on 999-1234, wait for a five-second silence and then tone dial an ID code of 1234: • Type: ATDT9991234@1234 J initiate MNP 10 at 1200 bps This modifier allows you to select MNP 10 and make the initial connection at 1200 bps (V.22). MNP 10 is able to automatically adjust the line speed to suit the quality of the phone line. Refer to the chapter titled ‘Error Correction’ for details of MNP 10.
! hook flash The ! dial modifier issues a hook flash signal — the modem hangs up for a short period. Hook flashes are commonly used with PABXs to transfer calls. For example: To dial 0, hook flash and then dial 12345: • Type: ATD0!12345 ☞ UK Modems. Use of the hook flash is not allowed in the United Kingdom. SRegister 29 sets the duration of the hook flash. S=n dial stored phone number n The modem allows you to store phone numbers in non-volatile memory.
AT Commands If the modem received any characters from the computer while it is waiting for a dial tone, it will hang up, return to local command state and send a NO CARRIER message.
ATE Echo The E commands enables you to select whether the characters you type at your keyboard (while in the local command state) will be echoed back to the screen by the modem.
AT Commands ATH Hang Up The H command forces the modem to hang up. The H0 command (Hang up) is used to terminate a call. The H1 command (Go off- hook) can be used to make your modem appear as busy to a remote modem trying to dial in. When you issue the H1 command, the modem goes off-hook but will not generate carrier or answer tones. The H2 command causes the modem to go off-hook after the current connection terminates.
ATI Identity Your modem contains a product identity code, also known as the firmware identity code.You can use the I command to display these codes.
AT Commands ATL Speaker Volume Control Your modem has a volume control which allows you to adjust the volume of its internal speaker. Your modem is preset for comfortable listening levels in a normal office environment, so most users will not need to change the preset volume of their modem.
ATM Monitor Your modem has a built-in speaker enabling you to monitor the progress of calls. You can listen for dial tones, busy signals, a successful connection to another modem, or someone answering your call. The M command controls the operation of the speaker. ☞ Some modems also provide volume control via the L command. Options ATM0 Speaker is always off ATM1 ■ Speaker is on whenever the modem is dialling or answering a call.
AT Commands ATO Return to On-line State The O command enables you to return to on-line state from command state. When you are online (connected to a remote computer), anything you type is treated as data by your modem. If you want to send commands to your modem, you must return to local command state by typing the escape sequence (+++). When you are ready to return to on-line state, use the O command.
ATO27 Change line speed to 14,400 bps (V.32bis/V.34) ATO28 Change line speed to 16,800 bps (V.32bis/V.34) ATO29 Change line speed to 19,200 bps (V.32bis/V.34) ATO30 Change line speed to 21,600 bps (V.32bis/V.34) ATO31 Change line speed to 24,000 bps (V.32bis/V.34) ATO32 Change line speed to 26,400 bps (V.32bis/V.34) ATO33 Change line speed to 28,800 bps (V.32bis/V.34) ATO34 Change line speed to 32,000 bps (V.32bis/V.34) ATO35 Change line speed to 33,600 bps (V.32bis/V.
AT Commands ATQ Quiet (Suppress Response Codes) Your modem has a variety of messages or response codes which it sends in response to various commands. Examples of these codes are the OK and CONNECT messages. The Q command allows you to switch these messages on and off. If you switch the messages off, no response codes will be displayed on your screen — with the exception of responses from the ATSn? command and AT&V command.
ATR Set Terminal Speed The R command allows you to switch off “autobauding” and specify the terminal speed at which your modem operates. Normally your modem uses autobauding, meaning that when you issue commands to your modem, it automatically detects the speed at which you issue the commands and changes its terminal speed to match your computers terminal speed.
AT Commands ATR26 26,400 bps (locked terminal speed - no autobaud) ATR28 28,800 bps (locked terminal speed - no autobaud) ATR38 38,400 bps (locked terminal speed - no autobaud) ATR57 57,600 bps (locked terminal speed - no autobaud) ATR76 76,800 bps (locked terminal speed - no autobaud) ATR96 96,000 bps (locked terminal speed - no autobaud) ATR115 115,200 bps (locked terminal speed - no autobaud) ATR230 230,400 bps (locked terminal speed - no autobaud) ATR460 460,800 bps (locked terminal spe
ATSn? Display S Register Value The Sn? command allows you to read the value in a particular Special Register (S Register). The command is in the form: ATSn? where n is the number of the S Register you want to read. For example: The number of times the modem will allow the phone to ring before answering an incoming call is determined by the value in S Register 0.
AT Commands ATSn= Set S Register Value The Sn= commands enables you to change the value in a Special Register (S Register). The format for the command is: ATSn=x where n is the number of the S Register whose value you wish to change and x is the value you wish to place in the register. For example: The character interrpreted as being a carriage return, is determined by the value in S Register 3. The default value of this register is 13.
ATV Verbal Response Codes Your modem can display either verbal or numeric response codes in response to various commands. The V command enables you to select which type of response code you want to display.
AT Commands ATW Connection Speed Information The W command allows you to decide whether your modem will report its line speed or terminal speed when it connects to another modem.
ATX Extended Response Codes The X command enables you to choose which response codes will be displayed.
AT Commands 0-6 See Also Q command Quiet (Suppress Response Codes) V command Verbal Response Codes W command Connection Speed Information \V command Error Correction Response Codes %U command V.
ATZn Restore Configuration Profile Your modem is supplied with a default operating set up. You can change this temporarily by issuing commands while you are working, or permanently by using the &Wn command to store profiles you’ve made in non-volatile memory (where n=profile 0,1,2 or 3). The Zn command returns the modem to saved configuration profile n.
AT Commands AT&B Character Length The &B command allows the modem to use character lengths of 8, 9, 10 or 11 bits. ☞ The modem will only match the speed of your computer when 10-bit or 11-bit characters are selected.
AT&C Controlling Data Carrier Detect The &C command enables you to control how DCD will operate. DCD is a RS-232 interface signal from the modem to a remote device, such as a terminal or a computer, indicating that the modem is receiving a carrier signal from a remote modem. This signal is switched on (asserted) when your modem is receiving a valid carrier signal from a remote modem.
AT Commands AT&D Controlling Data Terminal Ready The DTR signal is used to indicate to the modem whether your computer is ready to communicate. ☞ The &D command will only take effect when the DTR option switch is in the UP position and %S0 is selected. (See the Dumb Mode Section for details.) Options AT&D0 The modem ignores the DTR signal and acts as if it is asserted (the modem assumes the computer is ready to communicate).
AT&F. Reinitialise Modem The &F. command will completely re-initialise your modem. This command will delete stored phone numbers, security, and encryption settings. We recommend you execute this command immediately after installing your modem. All of the stored profiles in non-volatile memory will be restored to factory defaults. • Type: AT&F. Do not press ENTER A message will be displayed: OK If you do not receive this message, re-check the connection of your modem to your computer. Repeat the command.
AT Commands AT&F Restore Factory Defaults Your modem comes with factory default settings for all communications settings and S Registers. The &F command enables you to restore the factory default values to the command settings and S Registers. This command does not reset stored phone numbers, security, or encryption settings. The &F1 command selects non-error correction factory defaults. The defaults selected are: X0 &K0 &D2 \N1 %C0 The &F2 command selects synchronous mode factory defaults.
AT&G Guard Tone The &G command controls the generation of guard tones. A guard tone is a predetermined frequency generated by the modem to supervise the communications path. The &G command only affects V.22 and V.22bis connections.
AT Commands AT&H Clock Control The &H command determines when clocks will be applied to the ‘RxC’ RS- 232 signal. With &H0 selected, the RxC signal will be active whenever a synchronous mode is selected. With &H1 selected, the clock will only be present after a connection has been established to another modem.
AT&K Flow Control The &K command enables you to select the type of flow control used between your modem and the local computer when asynchronous mode is selected.You may want to do this to prevent possible data loss resulting from buffer overflow. Using flow control guarantees that data buffers in your modem and computer won’t overflow.Your modem and your terminal or computer must be using the same type of flow control.
AT Commands the modem to the computer.
AT&L Leased Line The &L command allows you to specify whether your modem will be connecting over the public switched telephone network (PSTN) or leased lines (point-to-point connection). When the leased-line mode is selected, if the carrier from the remote modem is lost, the modem will continuously attempt to re-establish a connection. If you select leased line operation with the &L1 command, you must issue the ATA command to answer a call, and the ATD command to initiate a call.
AT Commands AT&M Synchronous/Asynchronous Mode The &M command enables you to select either asynchronous or synchronous operation. During asynchronous transmissions, the time between characters being sent may vary, and the characters are delimited by start and stop bits to co-ordinate data transfer. During synchronous transmissions, the interval between the transmission of each character is of equal length, controlled by clock signals.
Range 0-2, 4 See Also &D command Controlling DTR &X command Synchronous Clocks &Z command Stored Phone Number Page 120
AT Commands AT&N Abort Connection The &N command determines whether the modem will abort the attempt to make a connection if sent a character by the computer. You can abort connection by either lowering the DTR (Data Terminal Ready) signal, or by sending a character (except a null or line feed character) to the modem. ☞ If you have used the &N0 command and the DTR Option switch is in the down position, you will not be able to abort dialling after the D (Dial) command is issued.
AT&R RTS/CTS Control The &R command allows you to determine the relationship between the RTS (Request to Send) and CTS (Clear to Send) signals, when operating in synchronous mode. The &R command is ignored whenever asynchronous mode is selected. %R1 overrides the &R command. Options AT&R0 ■ CTS follows RTS when the modem is on line. AT&R1 CTS is always asserted.
AT Commands AT&S Controlling DSR The &S command allows the modem to control the state of the DSR (Data Set Ready) signal. This command will only take effect when the DSR option switch is in the UP position (see your Dumb Mode Section for details). %S overrides the &S command.
AT&Vn View Active Configuration Profile The &V command allows you to view the active configuration profile of your modem. This shows the settings of AT commands and S Registers. Not all AT commands and S Registers will be shown. For example, the commands which relate to V.25bis operation will only appear when V.25bis mode is selected.
AT Commands AT&Wn Write Configuration Parameters The &Wn command allows you to save the current configuration profile including communications settings and S Register values into 1 of 4 stored profiles in the modem’s nonvolatile memory. The values contained in the modem’s non-volatile memory specified by the &Y command will be loaded when the modem is next switched on. The &Zn command restores the specified profile to the active configuration.
AT&X Transmit Clock The &X command nominates the source of its transmit clock signal when operating in synchronous mode. The receive clock is always derived from the receive (remote) carrier signal. Options AT&X0 ■ Synchronous clocks generated by Modem. The modem generates the transmit clock and applies it to pin 15 of the RS232 socket AT&X1 Clocks generated by computer - external clocking.
AT Commands AT&Yn Select Stored Profile on Power Up The &Yn command determines which stored (User) profile is selected as the Active profile when the modem is switched on and also when &D3 is selected and DTR drops.
AT&Z Stored Phone Number The &Z command enables you to store phone numbers in your modem’s nonvolatile memory. The command takes the form &Zn=x, where x is the phone number you want to store and n indicates which of the stored phone numbers it will be saved as. Stored numbers may contain up to 20 characters, including dial modifiers.
AT Commands AT#A Universal Remote Access This command allows a controlling modem to take control of a remote modem. All commands of the remote modem(s) are available to the controlling modem, with the exception of the Test commands. (DES keys can be changed and will take effect from the next connection made to the modem.) To initiate remote access, the user of the controlling modem should: • Type: **** (the remote access sequence) (with 1.
Range 0-2 Page 130
AT Commands AT#B 1200bps Originate Mode The #B command determines whether the modem will use V.23 or V.22 for its 1200 bps originate speed when B0 or B2 is selected. By default, your modem will use V.23 as its 1200 bps connection standard with B0 selected and V.22 with B2. #B1 reverses these settings. Options AT#B0 ■ B0 = V.23 B2 = V.22 AT#B1 B0 = V.22 B2 = V.
AT#C V.25 Calling Tones The #C command determines whether the modem will generate V.25 calling tones when operating in originate mode. V.25 calling tones are generated as a measure of courtesy if the telephone number you dial is answered by a person rather than a modem or other electronic device. It also allows an electronic device to select the appropriate operating mode. V.25 tones indicate to the answerer of a call that a modem in data mode (not fax) is the originator of the call. Options AT#C0 V.
AT Commands AT#CID Caller ID The #CID command allows the user can set up the modem to display the number of all inbound calls and selectively answer or not answer the call depending on whether the caller is known. The modem can also be programmed to play a unique ‘tune’ if the caller is known. When enabled a message will be inserted between the 1st and 2nd RING responses from the modem.
Options AT#CID0 ■ Caller ID disabled AT#CID1 Caller ID enabled AT#CID2 Caller ID enabled with response to host in hex format AT#CID3 Caller ID enabled with extended response See Also Refer to the section on Caller ID #S Command Security Menu Range 0-3 Page 134
AT Commands AT#D V.25bis Direct Calling This command determines whether direct calling procedures (or ‘DTR dialling’) will be used when V.25bis mode is selected. Refer to the section titled ‘Direct Dialling’, which appears in the V.25bis chapter, for details of how direct dialling works.
AT#E Encryption The #E command allows you to select DES encryption operating mode. The #E1 command enables standard DES encryption. DES encryption allows you to encrypt data being passed to a remote modem. The remote modem must support Cipher Feedback (or CFB) DES encryption to decrypt the data sent from your modem. You may compress the data before encryption using %C option. The #E2 command enables the SuperSecure option.
AT Commands AT#H Display Help The #H or ? command may be followed by a command or keyword to display a description of a command.
AT#I V.22bis Leased Line The ITU specifies that in V.22 and V.22bis a different handshake should be used for leased line mode. This mode is specified by default. Some modems still use the standard PSTN handshake for leased line connections. Use #I1 to connect to these modems in V.22bis leased line mode. Options AT#I0 ■ V.22bis leased line normal AT#I1 Use non-standard PSTN V.
AT Commands AT#J V.42 Capability Checking The #J command allows you to select whether your modem will check if the modem it is connecting to supports V.42, MNP or no error correction. This command only affects your modem when it dials another modem. If #J0 is selected, your modem will assume the answering modem is a V.42 modem. You should only issue the AT#J0 command when you are certain the other modem is a V.42 modem. WARNING You will not be able to communicate with a non-V.
AT#K MNP 10 mode MNP 10 works in conjunction with error correction and data compression to improve the performance of your modem when operating with poor or varying quality telephone lines (as sometimes found with cellular or overseas telephone connections). MNP is the only type of error correction allowed with MNP 10 and is only available when connected to another modem that supports MNP 10. Refer to the chapter titled ‘Error Correction’ for details of MNP 10.
AT Commands AT#M Command Mode Selection The #M command selects AT command mode or V.25bis operating mode. See the section — V.25bis Operations — for an explanation of V.25bis. The #M command doesn’t take effect until the an AT&W and an ATZ command are issued. Options AT#M0 ■ AT command operation AT#M1 Asynchronous V.25bis AT#M2 Synchronous V.25bis (HDLC framing) AT#M3 Synchronous V.25bis (Char.
AT#N V.25bis Character Encoding Use the #N command to select either NRZ or NRZI character encoding for V.25bis synchronous operation. This command only takes effect when a synchronous V.25bis operating mode is selected. Before setting the #N command, check which character encoding method is expected by your computer.
AT Commands AT#O Buffer Overflow The #O command decides what happens when your modem buffers fill and can no longer accept data. This will occur if data is received faster than your computer or modem can accept it. ☞ The #O command is not supported when a variable speed mode connection is established. Options AT#O0 ■ Characters are ignored if the modem buffers overflow. AT#O1 Modem disconnects if the terminal buffer overflows (that is, data from the computer to the modem).
AT#Q V.25bis Terminal Speed This command allows you to specify the V.25bis terminal speed. When AT#Q0 is issued, your modem will use the speed at which you issued the last AT command for V.25bis mode. Alternatively, you may issue one of the other #Q commands to select a specific V.25bis terminal speed.
AT Commands AT#R Enable Remote Control The #R command allows a remote modem to control your modem. Once a connection has been established, issuing the #R command will enable remote control mode. After the command is issued, any commands the remote modem sends to your modem will be acted upon by your modem, as if commands were being issued from the computer attached to your modem. You can terminate remote control by issuing an ATO command.
AT#S Security Menu The #S command orders the modem to enter the Security Menu mode.
AT Commands AT#U V.25bis Character Set The #U command is used to select the character set to be used when V.25bis mode is selected. ASCII characters are used by most computers; EBCDIC characters are used primarily by IBM mainframe computers.
AT#V Verifier The #V command selects whether your modem will check the validity of the commands you issue to it. Your modem can check both AT commands and values you write to the S Registers. When you use the #V0 command, no checking is performed on commands you issue. If you issue an unsupported command, the modem responds with an OK message. With #V1 selected, if you attempt to issue an invalid command or read or write to a reserved S Register, the modem will return an ERROR message.
AT Commands AT%B AutoAnswer Setting The %B command sets the number of rings before your modem answers. The default setting %B0 turns off AutoAnswer.
AT%C Compression Control Data compression is a technique used to reduce the size of data being transmitted without losing any of the original information. Compressed data must be decoded at the receiving end of the communications path in order to extract the original information. Full details on the subject of data compression can be found in the Error Correction Section of this guide. ☞ When selecting a data compression mode, error correction must also be selected.
AT Commands AT%D Set Disconnect Delay The %D command enables you to set a delay between the time the modem is told to hang up and when it actually goes on hook. The modem will hang up whenever you issue an ATH command or the DTR (Data Terminal Ready) signal is lowered — after an &D2 or &D3 command is issued. A value of 0 or 255 disables the disconnect delay. If you have defined a disconnect delay, the modem will attempt to empty the contents of its data buffers before hanging up.
AT%E Auto EQM Retrain The %E command allows an originating modem to automatically retrain its comunications equalisers during V.22bis MNP connections, or change the speed at twhich it is connected to another modem. S Register 33 and S Register 45 contain EQM (Eye Quality Monitor) threshold values. When the quality of the connection deteriorates to this value, the modem will attempt to retrain the connection.
AT Commands AT%F DTR/DSR override Front panel Option switches 1 and 2 may be used to control the DTR and DSR signals, or select V.25bis operation. Refer to the Dumb Mode section for details Options AT%F0 A & B switches control V.
AT%H MNP 10 Negotiation Speed This command allows you to determine the speed at which your modem will begin MNP 10 connections. MNP 10 can change the speed of the connection depending upon the quality of the line. This command sets the initial connection speed only. By initiating MNP 10 at a lower speed you can ensure that an error correcting link is established when this may not be possible at the highest speeds. Refer to the chapter titled ‘Error Correction’ for details of MNP 10.
AT Commands AT%K CTS During Dial and Handshake This command may be used with computers that expect the CTS signal to be raised when your modem is connected to a remote modem and is ready to send data. This command will interfere with the Abort Connection command (&N) if your computer cannot send characters to the modem when CTS is low.
AT%L Display Line Signal Level The %L command allows you to display the received signal level. The value returned is a 3-digit number, for example: 009 = -9 dBm 043 = -43 dBm AT%L Display received signal level Examples • Type: AT%L The line signal level is displayed.
AT Commands AT%Ln Transmit Level (Data Mode) This command allows you to alter the transmit level of your modem. The command is in the form: AT%Ln where n is the level you wish to select. For example: To set the transmit level to -15dBm: • Type: AT%L15 WARNING Do not change the transmit level of your modem unless you have a specific reason for doing so. Changing the transmit level of your modem may adversely affect its performance.
AT%M Mode LED Indication If your modem has three ‘Mode’ LEDs, you can use the %M command to determine whether the LEDs will indicate the line speed or the quality of the line. The Mode LEDs provide an indication of the line speed or line quality when you are connected to another modem only. If you have issued the %M0 command, refer to the table on the underside of your modem to determine the line speed.
AT Commands AT%N Non-Standard Terminal Speeds Options AT%N0 ■ Standard Baud Rates AT%N1 Standard to 14400 then 20800, 31200, 41600 and 62400 AT%N2 Standard to 38400 then 51200 Page 159
AT%P CONNECT Message Timing This command allows you to determine whether the CONNECT message will be sent before or after the DCD signal is asserted by your modem. Some Unix computers require the CONNECT message to appear after DCD is asserted. In this case, the AT%P1 command should be used.
AT Commands AT%Q Line Signal Quality The %Q command allows you to display the line signal quality. This command is not applicable to V.21, V.23 or Bell 103 connections. A lower value indicates a good quality connection.Values above 40 indicate a bad quality line signal and that you should shift to a lower speed or use MNP10. Values below 30 indicate a good quality line signal. Options AT%Q Display line signal quality Examples • Type: AT%Q The line signal quality is displayed.
AT%R CTS Override The %R command allows you to determine the state of the CTS signal. This command is intended to replace the CTS switch if your modem does not have one (eg Pocket & Rack Modems) This command overrides any &R setting. ☞ The %R command does not revert to the default setting after an ATZ, AT&F or modem power off is performed. Options AT%R0 ■ &R command determines the state of CTS AT%R1 CTS always follows RTS (both in on-line state and local command state) AT%R2 V.
AT Commands AT%S DSR Override The %S command allows you to determine the state of the DSR signal. This command is intended to replace the DSR switch if your modem does not have one (eg. Pocket & Rack Modems). If your modem has a DSR option switch, the switch setting will take preference to %S. %S1 overrides any &S setting. ☞ The %S command does not revert to the default setting after an ATZ, AT&F or modem power off is performed.
AT%T DCD Override The %T command allows you to determine the state of the DCD signal. This command is intended to replace the DCD switch if your modem does not have one (eg. Pocket & Rack Modems). If your modem has a DCD option switch, the switch setting will take preference to %T. %T1 overrides any setting of &C ☞ The %T command does not revert to the default setting after an ATZ, AT&F or modem power off is performed.
AT Commands AT%U V.42 Response Codes The %U command allows you to change the response codes issued by your modem when a V.42 connection is established. Compression & encryption messages will be added if active. After the %U1 command is issued, if your modem establishes a connection with V.42 error correction, a CONNECT/LAP-M message will be sent to your computer. If an MNP connection is established, a CONNECT/REL message will be sent to your compuuter.
AT%W Welcome Message The %W command allows the answering modem to send a user specified message to the originating modem immediately after connection. This facility can be used to identify a company name, a particular service provided by this modem or simply to identify the modem itself. The message to be sent to the remote modem is specified by using the *W command. If used with dial back security the original answering modem will transmit the welcome message after it has dialed back.
AT Commands AT\A MNP Block Size The \A command allows you to select the maximum block size to be used by your modem over an MNP error-corrected connection.
AT\Bn Generate Break The \Bn command is used to send a break sequence to the remote modem of length n*100mS. The length of the break sequence may be set from 0.1 seconds to 0.9 seconds. The default length of breaks generated by the modem is 0.3 seconds. The \K command determines how the modem will react when a break sequence is received. This command stores the break length into S43 in units of 20mS. Options AT\B4 Generate a break sequence 0.
AT Commands AT\J Auto-Reliable Fallback This command allows you to select whether your modem (when operating in auto-reliable mode) will use Constant Speed mode or Variable Speed mode. If, with \J0 selected, an error corrected auto-reliable connection cannot be established with another modem, the modem will fall back to Constant Speed mode. Selecting \J1 will cause the modem to operate in Variable Speed mode.
AT\K Break Control The \K command determines how the modem will react when a break sequence is sent from your computer or received from the remote modem. During error corrected connections the modem sending the break determines how the receiving modem will react. During non-error corrected connections, the receiving modem determines how it will react. The default break control setting is \K5.
AT Commands ☞ If a break sequence is received by the modem while it is in local command state (and is maintaining a constant speed connection), the modem will not process the break until it returns to on-line state. If the break sequence is received by the modem while it is in local command state and maintaining a variable speed connection, the break will be ignored.
AT\N Asynchronous Operating Mode The \N command allows you to select any of your modem’s four asynchronous operating modes. AT\N0 selects constant speed mode, enabling the modem to use different terminal and line speeds. Your modem supports constant terminal speeds from 300 bps to 460,400 bps. For example, with constant speed selected the modem could connect with a remote system using V.22 (1200 bps) while communicating with your computer at 115,200 bps.
AT Commands See Also B command Communications Standard &K command Flow Control \J command MNP Fallback #J command V.
AT\Q Extended Flow Control The \Q command enables you to select flow control (handshaking) between your modem and computer. While performing the same function as the &K command, the \Q command provides compatibility with Microcom modems. Flow control is only available when the modem is configured for constant speed mode or reliable or auto-reliable modes, and is operating in on-line state. Flow control will be ignored when your modem is configured for variable speed mode or is in local command state.
AT Commands AT\S Display Active Configuration The \S command allows you to display the current active configuration.
AT\Tn Inactivity Timer (Data Mode) The \Tn command specifies the number of minutes the modem will stay on line when no activity is occurring. The timer may be set from 1 to 42 minutes of inactivity. Selecting 0 minutes will disable the timer. When the inactivity timer expires, the modem will hang up and return a NO CARRIER message with S42 = 12. The inactivity timer is only available when error correction or Constant Speed mode is selected.
AT\V Error Correction Response Codes The \V command allows you to select the error correction response codes when an error corrected connection is established. With error correction response codes enabled, the messages are returned when a connection is established using error correction. If the ATX0 command has been issued, only the CONNECT/REL will be generated by the modem, regardless of the connection speed, after the \V1 command is issued.
AT\X XON/XOFF Pass Through The \X command enables you to define whether XON and XOFF (software handshake) characters are allowed to pass through the modem to the remote system. The \X command only affects XON/XOFF characters sent from your computer to your modem. It does not affect XON/XOFF characters sent from a remote system to your modem. ☞ When the modem is configured for XON/XOFF flow control, passing through XON/ XOFF characters may interfere with the modem’s control of data flow.
AT Commands AT*K Select Primary DES KEY from Stored Keys The *K command allows the user to select the DES key from the 10 available stored keys. Default 0 Range 0-9 See Also #S Security #E Encryption ☞ The Security & Encryption section contains information on the application of the *K command.
AT*R V.13 Remote RTS Signalling The *R command allows your modem to simulate carrier control on a Synchronous Link by transmitting the local state of RTS to the remote modem. Some systems rely on RTS as an indicator of Terminal Ready to Send. When modems are inserted between the host and the terminal the status of RTS is not known since the state of RTS is not normally transmitted over the link. The V.
AT Commands AT*S Change Current User Password The *S command allows the user to change their own password. If the user is connected the modem will ask for the current password before prompting for a new password. The user will then be asked to repeat the new password for verification. If the user is not connected the name of the user whose password is to be altered must also be specified. ☞ If password expiry is enabled the password age will be reset to zero days.
AT*T Auto Call Redial The *T command allows you to select whether the modem will redial the last number dialed automatically. If enabled the modem will dial the last number after 10 seconds.
AT Commands AT*V Maximum V.42bis Dictionary Size The V.42bis dictionary size is normally negotiated during the V.42 handshake. The Telenetics Global Carriers have enough memory to store 8,192 dictionary entries. This will allow 8:1 compression on some file types. Some modems do not correctly negotiate the dictionary size, in these cases the user should reduce the dictionary size to 2,048 entries (4:1 compression ratio).
AT*W Welcome Message Text The *W command allows the user to specify the message that will be sent to the originating modem immediately after CONNECT if the %W1 Welcome Message is enabled. The message may contain any text limited only by the maximum command line size (80). The message may include new lines which are indicated by using the ‘|’ character. If %W1 is enabled the text you have specified will be displayed at the end of the &V display.
AT Commands AT*Y Escape Seq. Detection in Sync. Escape Sequence Detection (i.e. +++) is normally disabled in all synchronous modes. This is because synchronous data cannot generate silences around the +++. However to diagnose line performance you need to be able to escape to command mode. To allow these diagnostics to take place the user may select the *Y1 option before making a synchronous connection and then attaching a asynchronous terminal to the modem.
AT+ICF Character Framing and Parity Select The +ICF command is used in conjunction with the R command to select the character format and parity of the RS232 interface when not in autobauding mode or if autobauding to 230kbps.
AT Commands AT+MS Select Modulation The +MS command selects the modulation, optionally enables or disables automode, and optionally specifies the lowest and highest connection rates using one to six subparameters. The command format is: +MS= [,[][,[][,[][,[][,[]]]]] Subparameters not entered (enter a comma only or to skip the last subparameter) remain at their current values.
41333, 40000, 38667, 37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000 56 K 56flex 56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000, 40000, 38000, 36000, 34000, 32000 64 Bell 103 300 69 Bell 212 1200 The modem may also automatically switch to another modulation (automode), subject to the following constraints: • The modem may not be able to automatically switch from the current modulation (specified by ) to some other modulation.
AT Commands V.8 is not supported by the remote modem. • When V.90 is enabled the speeds listed can be used to set the maximum speed. For example: AT+MS=12,1,300,38667 This sets the maximum V.90 speed to 38667. Only the maximum speed is applicable when using V.90. The minimum speed cannot be set. • If is greater than the highest rate supported by the modulation specified by , the modem automodes down from the highest rate of the selected modulation.
is an optional number which enable or disables robbed bit signaling generation in a server modem or enables or disables robbed bit signaling detection in a client modem. The option are: 0 = Robbed bit signaling generation (server modem) or detection (client modem) disabled (default) 1 = Robbed bit signaling generation (server modem) or detection (client modem) enabled +MS? Reporting selected options +MS=? Reporting supported options Nn Automode 1.
AT Commands AT+MS=? Reporting Supports Options The modem can send a string of information to the DTE consisting of supported options: Options +MS=? Example +MS: (0, 1, 2, 3, 8, 9, 10, 11, 12, 56, 64, 69, 74), (0,1) (300-56000), (300-56000) See Also +MS? Reporting selected options +MS Select modulation Range +MS: (list of supported values), (list of supported values), ( list of supported values), (list of supported values).
AT-Q MNP10 Fallback to V.22bis The -Q command permits the modem to fallback from a V.34, V.32bis or V.32 connection with MNP10, to a V.22bis or V.22 MNP10 connection. MNP10 has the ability to make decisions regarding line quality and will request a change in speeds if it decides the phone line is not sufficient quality to maintain the current connection speed. Options AT-Q0 Disable fallback to V.22bis or V.22 AT-Q1 ■ Enable fallback to V.22bis or V.
AT Commands AT-DATE Time & Date The -DATE command allows the modem to record the Time and Date in the log information inbound and outbound calls. The Time and Date will be set by an inbound call with Caller ID information or by issuing the AT-DATE command. The Call Logging Function (AT-LOG) automatically records the Date, Time, Phone Number and Name of any inbound call that has Caller ID information.
AT-LOG Call Log The AT-LOG command will automatically record the Date, Time, Phone Number and Name of any inbound call that has Caller ID information. In addition the modem will also log all outbound calls that are originated by the modem and record the phone number, connect speed, disconnect reason and call duration. The modem will also log information about anonymous inbound calls if the call makes a data or fax connection. If the Time and Date have been set it will also record this.
AT Commands AT:E V.32 compromise Equaliser This command switches on or off the V.32 compromise equaliser. When operating over cellular connections, it may be desirable to switch off the V.32 compromise equaliser. For dial-up lines, the equaliser should be switched on. Options AT:E0 Disable the V.32 compromise equaliser AT:E1 ■ Enable the V.
V.25BIS - CIC Connect Incoming Call The CIC command may be issued if you decide to accept an incoming call after issuing the DIC command. For details, refer to the ‘V.25bis Operations’ section of this guide.
AT Commands V.25BIS - CRN Dial This command allows you to dial a telephone number. The basic dialling command is: CRN followed by the telephone number. For example: To dial the number (09) 111-1234 • Type: CRN091111234 You can use hyphens, spaces or parentheses. They will be ignored by the modem, but they will make it easier to read the command line. For example: CRN (09) 111-1234 Dial modifiers may be included in the dial command.
& hook flash The & dial modifier issues a hook flash signal — the modem hangs up for a short period. Hook flashes are commonly used with PABXs to transfer calls. For example: To dial 0, hook flash and then dial 12345: • Type: CRN0&12345 : wait for dial tone The : modifier causes the modem to wait for a dial tone before dialling. If the modem does not detect a dial tone within 30 seconds, it returns a message of CFI AB, hangs up and returns to local command state.
AT Commands V.25BIS - CRS Dial Stored Number Your modem allows you to store phone numbers in non-volatile memory. The basic form of the CRS command is: CRS n where n is the stored phone number you wish to dial. For example: To dial stored phone number one: • Type: CRS 1 ☞ Refer to your Modem Commands for details of how many phone numbers may be stored in your modem.
V.25BIS - DIC Disregard Incoming Call The DIC command is used to disregard incoming calls. When your modem receives an incoming call, an INC message is sent to your computer. You then have the number of seconds defined by S Register 71 to disregard the call. If you issue the DIC command, the call will be ignored, otherwise the modem will answer the call after the number of seconds defined by S Register 71.
AT Commands V.25BIS - PRN Stored Phone Number The PRN command allows you to store phone numbers in your modem’s nonvolatile memory. The command takes the form: PRNn;x where x is the phone number you want to store and n indicates which of the stored phone numbers it will be saved as. Stored phone numbers may contain up to 20 characters, including dial modifiers.
V.25BIS - RST Reset Your modem is supplied with a default operating set up. You can change this temporarily by issuing commands while you are working, or permanently by using the &W command to store changes you’ve made in non-volatile memory. The RST command returns the modem to the last saved configuration and causes it to perform a power-on self-test. ☞ When you issue the RST command, you must issue an ATZ command to select V.25bis command mode.
S Registers S Registers Introduction Your modem contains a number of registers — memory stores — which define the modem’s operating characteristics. These registers are called Special Registers or S Registers. This section of the Global Carrier 56 User Guide shows you the function and usage of each S Register, how to check the current contents of your S Registers, how to change S Register settings and how to save the settings in non-volatile memory.
2 ROM chips that have their data placed into them at the factory. They retain their information when the power is switched off. You cannot make changes to information stored in ROM chips. Information such as factory default settings for S Registers is stored in your modem’s ROM chips. 3 Non-volatile memory retains data without requiring power. You can change the data in nonvolatile memory by using a special command (&Wn) to write the current settings to memory.
S Registers ATS0 Rings Before Answer S Register 0 contains a decimal value (from 0-255) indicating the number of rings the modem will wait before answering an incoming call. If you place a value of 0 in this S Register, auto-answer operation will be disabled. The default value for S Register 0 is 0 — the modem will not answer an incoming call.
ATS1 Ring Count S Register 1 contains a decimal value (from 0 to 255) indicating the number of rings detected. S Register 1 is incremented each time a ring is detected. It will be cleared if no ring occurs within 8 seconds of the last ring.
S Registers ATS2 Escape Sequence Character S Register 2 contains the ASCII value of the characters which form the escape sequence. The default value for this register is 43. The modem will recognise three + characters (+++) as the escape sequence. Setting this register to a value greater than 127 disables the modem’s recognition of the escape character.
ATS3 Carriage Return Character S Register 3 contains the ASCII value of the character recognised by the modem as the Carriage Return character in local command state.
S Registers ATS4 Line Feed Character S Register 4 contains the ASCII value of the character recognised by the modem as the Line Feed character in local command state.
ATS5 Backspace Character S Register 5 contains the ASCII value of the character recognised by the modem as the Backspace character in local command state. The preferred values for this register are ASCII codes 0 to 32 or 127. Default 8 Example ATS5=127 Recognise the DEL character as the backspace.
S Registers ATS6 Dial Tone Wait Time S Register 6 determines how long the modem will wait for a dial tone after going off-hook and before dialling. This register contains a value indicating the number of seconds the modem will wait for a dial tone. This provides slow telephone exchanges the opportunity to apply a dial tone to the line before the modem attempts to dial.
ATS7 Wait for Carrier S Register 7 contains a value, in seconds, equivalent to the length of time the modem will wait for answer tone after dialling. If an answer tone is not detected within the time specified in this register, the modem will hang up and return a NO CARRIER message. After an answer tone is detected the modem has another 57 seconds to complete the handshake The answering modem has 57 seconds to complete the handshake after starting answer tone.
S Registers ATS8 Pause Dial Modifier Delay S Register 8 contains the time in seconds the modem will wait when it encounters a comma (the pause dial modifier) in a dialling sequence. ☞ UK Modems. Changing S Register 8 from its default value may invalidate the approval of your modem.
ATS9 Carrier Detect Response Time S Register 9 contains the length of time, in tenths of a second, the modem will wait before asserting the DCD (Data Carrier Detect) signal, after a carrier has been detected. The longer the time taken before asserting DCD, the less chance of line noise being mistaken by the modem as a carrier signal.
S Registers ATS10 Lost Carrier/Hang Up Delay S Register 10 contains the amount of time, in tenths of a second, the modem will wait after the carrier has been lost before hanging up. If a value of 255 is placed in this register, the modem will not hang up after the carrier is lost from the remote modem. In this case, you must use the H command to hang up. Examples ATS10=12 Wait 1.
ATS11 DTMF Tone Timing S Register 11 contains the time, in thousandths of a second, of the duration and spacing of tones when tone dialling (DTMF tones). Examples ATS11=120 Space tones at 0.
S Registers ATS12 Escape Sequence Guard Time The Escape Sequence Guard Time is the time delay required immediately before and after entering an escape sequence. For your modem to distinguish the escape sequence from ordinary data, there must be a period of silence both before and after the escape sequence is entered.
ATS16 Test in Progress (read only) S Register 16 contains the number of the &T test command in progress. If no test is in progress S16 is 0.
S Registers ATS18 Test Timer S Register 18 contains the length of time, in seconds, that the modem will perform tests initiated with any of the &T commands. You can terminate any test by issuing an AT&T0 command, or by allowing the time in the Test Timer to expire. Placing a value of 0 in S Register 18 disables the Test Timer, forcing you to use an AT&T0 command to terminate tests.
ATS25 DTR Loss Detection S Register 25 determines the time, in hundredths of a second, the DTR (Data Terminal Ready) signal must remain low before the modem will recognise a loss of DTR. Examples ATS25=8 DTR must remain low for 0.
S Registers ATS26 RTS/CTS Delay If the RTS (Request To Send) signal is asserted when operating in synchronous mode, the modem will wait for the period defined by S Register 26 before asserting the CTS (Clear To Send) signal, when &R0 is selected. Values in this register are in tenths of a second. Examples ATS26=15 Wait 1.5 seconds after RTS has been asserted before asserting CTS.
ATS27 Delay Before Dial S Register 27 is used to define a delay of between 0 and 255 seconds which occurs after the D command is issued and before dialling commences. This should only be used when you intend to implement callback security. Providing a delay between the dialling command and actual dialling allows the calling modem sufficient time to hang up before the modem begins to call back. A 30-second delay should be sufficient time to allow most modems to hang up.
S Registers ATS29 Hook Flash Duration This S Register allows you to set the duration of the hook flash performed by your modem when the ! dial modifier is executed. Some PABXs may require a different hook flash length to the standard 0.5 seconds. The value held in S Register 29 is in hundredths of a second. Examples ATS29=30 Set the hook flash duraction to 0.
ATS30 Inactivity Timer Data Mode This S Register allows you to set the duration of the hook flash performed by your modem when the ! dial modifier is executed. Some PABXs may require a different hook flash length to the standard 0.5 seconds. The value held in S Register 29 is in hundredths of a second.
S Registers See Also ATS105Voice ‘Dead-man’ Timer Range 0-255 Page 225
ATS33 EQM Threshold Value S Register 33 is used to define the rate of change in the EQM (Eye Quality Monitor) value the modem will tolerate before initiating an equaliser retrain sequence. This S Register applies to V.32, V.32bis, V.FC & V.34 only. By setting this register with a low value, the modem will demand a high quality connection. Setting a high value in S33 will allow the modem to operate on degraded lines without invoking retrains. A value of zero will also disable automatic EQM retraining for V.
S Registers ATS38 Disconnect Delay S Register 38 determines the number of seconds the modem will wait before hanging up after the ATH command is issued or the DTR signal is lowered — after the &D2 command has been issued. If a disconnect delay has been defined, the modem will attempt to empty the contents of its data buffers before actually going on-hook. If the modem empties its buffers before the defined disconnect delay expires, the modem will hang up immediately.
ATS42 Modem Disconnect Reason 10 S Register 42 contains a value indicating the reason the modem last disconnected. 11 This allows you to check for possible faults if your modem suddenly hangs up or returns to local command state without you entering an escape sequence.
S Registers ATS43 Break Sequence Length The value in S Register 43 defines the length of a break (long space) sequence generated by the modem to your computer when constant speed, reliable or auto-reliable modes are selected. The \B command determines the length of breaks to the remote modem. Each unit is equivalent to 0.02 second. ☞ S Register 43 does not affect the length of the break generated by the modem when variable speed mode is selected.
ATS45 V.22bis EQM Threshold Value S Register 45 is used to define the EQM (Eye Quality Monitor) value the modem will tolerate before initiating an equaliser retrain sequence. This S Register applies to V.22bis only. By setting this register with a low value, the modem will demand a high quality connection. Setting a high value will allow the modem to operate on degraded lines without invoking retrains. A value of zero will disable automatic EQM retraining for V.22bis.
S Registers ATS57 DTR High Detection S Register 57 determines the amount of time, in hundredths of a second, that the DTR (Data Terminal Ready) signal must be high before the modem will recognise DTR being asserted. Example ATS57=8 DTR must be high for 0.
ATS62 V.42 Detection Timer S Register 62 allows you to set the V.42 detection timer. This specifies how long (in units of 0.01 seconds) the modem will send a V.42 detection pattern and wait for a V.42 detection pattern from the other modem. The originating modem sends the pattern then waits for a reply, the answering modem waits for the pattern then sends one in reply. ☞ Changing the value of this S Register may cause unreliable operation when attempting V.42 connections.
S Registers ATS66 Remote Access Guard Time The Remote Access Guard Time is the time delay required immediately before and after entering a remote access sequence. If the Remote Access Guard Time is one second and the remote access character has been defined as * (asterisk), you must maintain silence on the line for one second, then type **** (four asterisks) in rapid succession, then maintain another one second’s silence. The guard time is in units of 100 milliseconds (1/10th of a second).
ATS67 Remote Access Character S Register 67 contains the ASCII value of the characters which form the remote access sequence. The default value of this register is 42 (asterisk character). The modem will recognise four * characters (****) as the remote access sequence.
S Registers ATS69 Command Line Time-out S Register 69 determines how long you have to type a command, after typing an ‘AT’, expressed as seconds. If the modem times-out before you complete a command, an ERROR message will be sent by the modem. The default value of 60 allows you 60 seconds between the time you have typed ‘AT’ and when you press the ENTER key. A value of 0 (zero) disables this feature. Examples ATS69=120 Allow 120 seconds to type a command to the modem before timing out.
ATS71 Ignore Incoming Call This S Register is only applicable when your modem is operating in V.25bis mode. After an incoming call is detected, your modem will wait the number of seconds defined by S Register 71, allowing you to issue the DIC command if you do not wish to accept the call. For more details, refer to the section titled ‘Answering Calls’ which appears in the ‘V.25bis Operations’ chapter. Examples ATS71=10 Wait 10 seconds before accepting an incoming call.
S Registers ATS74 Disconnect Reason for Prev. Call S Register 74 contains a value indicating the reason the modem returned to local command state, for the call before last. Thus, the value in S Register 42 will be copied to S Register 74 prior to a new disconnect reason being placed in S Register 42. This register is mainly used to allow a remote modem to dial in, invoke remote access and enquire as to why the last connection failed.
ATS80 Flow Control High Water Mark This S Register controls when your modem uses flow control to stop data from your computer. Data to be sent by your modem is stored in a ‘buffer’ (a temporary storage area) until it can be sent by your modem. If the buffer begins to fill, your modem will use flow control to stop your computer sending more data. S Register 80 allows you to set the level at which the modem will use flow control stop your computer sending more data.
S Registers ATS81 Flow Control Low Water Mark This S Register controls when your modem uses flow control to resume the transmission of data from your computer. Refer to S Register 80 for a description of flow control water marks. ☞ Do not change the value of this S Register unless you are an experienced communications user. An inappropriate value may cause flow control between your computer and modem to become unreliable. Each unit is equivalent to 5% of your modem’s buffer.
ATS82 Failsafe Flow Control Overrun This S Register works in conjunction with the AT&K9 command. If you are in &K9 mode and the modem needs to assert flow control it first drops CTS. If the host is using CTS flow control it should stop sending further characters. If the host is using XOFF flow control it will ignore the CTS signal and keep sending data. S82 determines the number of characters the modem will accept after dropping CTS before sending XOFF.
S Registers ATS95 Extended Response Codes S Register 95 allows your modem to display extended response codes (or result codes). Because this S Register is a ‘bit-mapped’ register, values must be changed by storing the decimal number equivalent of the binary value represented bt the total of the bits.
ATS96 Help Page Width This S Register allows you to set the width of each Help page and the Configuration Profile (&V). You may change the width of each page to suit your computer.
S Registers ATS97 Help Page Length This S Register allows you to set the length of each Help page and the Configuration Profile (&V). You may change the length of each page to suit your computer.
ATS105 Voice ‘Dead Man’ Timer This S Register sets how long the modem remains in voice mode, when onhook and in nonautobauding mode, and when no characters are received from the computer. If the ‘Dead Man’ timer expires, the modem returns to data mode. This register may also be accessed by writing to S30 when in voice mode.
S Registers ATS122 AutoRateChange The maximum average EQM level reached before the modem will downshift a speed. The default is 55 which means that if the average EQM ever goes higher than 55, then a downshift in speed will occur. ☞ EQM stands for Eye Quality Monitor, and is a reading of the current line quality. To view the current EQM, after connecting enter local mode by typing +++ and then type: AT\V7.
ATS123 AutoRateChange This S Register sets the average EQM limit that the modem must do better than, to achieve an upshift. The default is 16 which means that for an upshift to be possible the average EQM must be 16 or lower (for S124 + 12 seconds).
S Registers ATS124 Duration EQM This S Register sets the number of seconds after 12 that the modem must maintain the average EQM below the S123 value. The default is 30 which means that for an upshift to be possible with a setting of S123=16, the modem must maintain an average EQM of below 16 for a minimum of 42 seconds.
Modem Response Codes Numeric 0 1 2 3 4 Verbal OK CONNECT RING NO CARRIER ERROR 5 6 7 8 10 11 12 13 20 22 23 24 25 26 27 28 30 31 32 33 34 35 36 37 38 95 97 39 40 43 44 45 46 47 48 96 98 49 50 60 61 62 63 70 71 72 73 165 166 CONNECT 1200 NO DIALTONE BUSY NO ANSWER CONNECT 2400 CONNECT 4800 CONNECT 9600 RINGING CONNECT/REL CONNECT 1200/REL CONNECT 2400/REL CONNECT 4800/REL CONNECT 9600/REL CONNECT 12000/REL CONNECT 14400/REL CONNECT 7200/REL CONNECT 12000 CONNECT 14400 CONNECT 7200 CONNECT 16800 CONNECT 19
Modem Response Codes 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT CONNECT 36000/REL 38000/REL 40000/REL 42000/REL 44000/REL 46000/REL 48000/REL 50000/REL 52000/REL 540
RS-232 Signals This section describes each of the signals supported on the modem’s RS-232 socket. ☞ Pin assignments are only applicable to products with a 25-pin DB-25 connector. Refer to your Product Guide for information regarding the pin assignments for your product. Transmit Data (TxD) - Pin 2 The computer transmits data to the modem via this pin. Receive Data (RxD) - Pin 3 The computer receives data from the modem via this pin.
RS-232 Signals Data Carrier Detect (DCD) - Pin 8 This signal indicates the presence of a compatible carrier signal. In asynchronous mode, the modem may be configured to assert DCD at all times, ignoring the presence of an incoming carrier signal. The &C command allows control over the state of the DCD signal. Transmit Clock (TxC) - Pin 15 This signal only affects the operation of the modem when synchronous mode is selected. This signal may be used to clock transmit data from the host computer.
Standard RS-232 Examples Page 252
Abbreviated Command List Abbreviated Command List General Commands +++ +++ **** ? A/ A Bn B0 ■ B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 B16 B17 B18 B19 B20 B21 B22 B23 B24 B25 B26 B27 B28 B29 B30 B31 Escape Sequence Return to local command state Remote Access Sequence Interactive Command Help Repeat last command Answer an incoming call Select Communications Standard Auto-Connect Auto-Connect Auto-Connect V.21 at 300bps Bell 103 at 300bps V.23 at 1200/75bps V.22 at 1200bps Bell 212A at 1200bps V.
B33 B34 B35 B36 B37 B40 B41 B42 B43 B44 B45 B46 B47 B48 B49 B50 B51 B52 B53 B54 B55 B56 B57 B58 B59 B60 B61 E0 E1 H0 H1 H2 I0 I1 I3 I4 I5 I9 I10 L0 L1 L2 L3 M0 M1 ■ ■ ■ K56flex at 38,000bps K56flex at 40,000bps K56flex at 42,000bps K56flex at 44,000bps K56flex at 46,000bps V.90 at 28,000bps (K56flex at 32,000bps) V.90 at 29,333bps (K56flex at 34,000bps) V.90 at 30,667bps (K56flex at 36,000bps) V.90 at 32,000bps V.90 at 33,333bps V.90 at 34,667bps V.90 at 36,000bps V.90 at 37,333bps V.
Abbreviated Command List M2 M3 M4 O0 O1 O2 O3 O4 O5 O6 O7 O8 O9 O10 O11 O12 O13 014 O15 O23 O24 O25 O66 O27 O28 O29 O30 O31 O32 O33 O34 O35 Q0 ■ Q1 Q2 R0 R1 R2 R4 R7 R9 R12 R14 R16 ■ Speaker is always on Speaker is off whenever the modem is dialling or once a connection is established Speaker is on whenever the modem is dialling or answering. The speaker will also be on during retrains or rate changes.
R19 R21 19,200 bps (locked terminal speed - no autobaud) 21,600 bps (locked terminal speed - no autobaud) R24 24,000 bps (locked terminal speed no autobaud) 26,400 bps (locked terminal speed no autobaud) 28,800 bps (locked terminal speed no autobaud) 38,400 bps (locked terminal speed no autobaud) 57,600 bps (locked terminal speed no autobaud) 76,800 bps (locked terminal speed no autobaud) 96,000 bps (locked terminal speed no autobaud) 115,200 bps (locked terminal speed - no autobaud) 230,400 bps (locked
Abbreviated Command List &F1 &F2 &G0 ■ &G1 &G2 &H0 ■ &H1 &K0 &K3 ■ &K4 &K5 &K9 &L0 ■ &L1 &L2 &L3 &M0 ■ &M1 &M2 &M4 &N0 &N1 ■ &R0 ■ &R1 &S0 ■ &S1 &S2 &Vn &V0 &V1 &V2 &V3 &V8 &Wn Select non-error correction factory defaults Select synchronous mode factory defaults Do not generate guard tones Generate guard tones of 550Hz Generate guard tones of 1800Hz Clock always present in synchronous mode Clock only appears after connection Flow control disabled RTS/CTS (hardware) flow control XON/XOFF (software) flow c
#J1 ■ #K0 #K1 ■ #K2 #M0 ■ #M1 #M2 #M3 #N0 ■ #N1 #O0 ■ #O1 #O2 #O3 #Q #Q0 #R #S #U #U0 ■ #U1 #V0 #V1 ■ %B0 ■ %B2 %C0 %C1 %C2 %C3 ■ %D0 ■ %E0 %E1 %E2 ■ %F0 %F1 ■ %H0 ■ Check V.42 compatibility Disable MNP 10 Enable MNP 10 Enable MNP 10 with cellular options command operation Asynchronous V.25bis Synchronous V.25bis (HDLC framing) Synchronous V.25bis (Char. framing-BSC mode) NRZ Character Encoding NRZI Character Encoding Characters are ignored if the modem buffers overflow.
Abbreviated Command List %T1 %U0 ■ %U1 %U2 %W0 ■ %W1 \A0 \A1 \A2 \A3 ■ \Bn \J0 \J1 \K \N \N0 \N1 \N2 \N3 \N4 \N5 \N6 ■ ■n \N7 \Q0 \Q1 \Q2 \Q3 \Q4 \Q5 \Q6 \S \Tn \T0 ■ \T35 \V0 ■ \V1 DCD is always high (only reset by &F.) Standard error correction response codes V.42 response codes sent when a V.42 error corrected connection is established Append /LAP-M or/REL (2,4,10) or /MNP-5 or /V.
12 ■ 56 64 69 -Q0 -Q1 ■ -DATE -LOG :E0 :E1 CIC CIC CRN CRS DIC PRN RST ■ 4800, or 2400 V.90 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667, 44000, 42667, 41333, 40000, 38667, 37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000 K56flex 56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000, 40000, 38000, 36000, 34000, 32000 Bell 103 300 Bell 212 1200 Disable MNP10 fallback to V.22bis or V.22 Enable MNP10 fallback to V.22bis or V.22 with MNP10 Time & Date Call Log Disable the V.
Abbreviated Command List 16 18 25 26 27 29 30 33 38 42 43 45 57 62 66 67 69 Test in Progress (read only) 0 0-8 Test Timer 0 0-255 DTR Loss Detection 5 0-255 RTS/CTS Delay 0 0-255 Delay Before Dial 0 0-255 Hook Flash Duration 50 10-100 Inactivity Timer 0 0-255 EQM Threshold Value 3 0-255 Disconnect Delay 0 0-255 Modem Disconnect Reason Break Sequence Length 15 1-255 V.22bis EQM Threshold Value 98 0-255 DTR High Detection 0 0-255 V.42 Detection Timer 75 (0.
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Glossary Glossary A ACK (Acknowledge) Control Character transmitted by a receiving device as an affirmation to a sending device. Alphanumeric Roman Letters (alphabetic) and Arabic numbers (numeric). Amplitude The height of a waveform measured in volts. Amplitude Modulation (AM) Transmission of information by varying the amplitude of a carrier signal. Analog Data Data in the form of continuously variable physical qualities. Compare with Digital data.
Auto dial The ability to make a connection with another modem automatically. (To dial a number automatically. usually using a stored number.) Auto range The ability of a modem to range over several modem standards to determine the standard of the calling modem. B Bandwidth The range of signal frequencies that are accepted or passed by a circuit or network. (The normal bandwidth on a telephone line is 3100Hz.) Baseband The frequency band occupied by a signal in its original or unmodulated form.
Glossary Bit rate The speed at which bits are transmitted, usually expressed as bits per second (BPS). Block Group of characters treated as a unit for the purpose of data transmission. BPS An acronym for Bits Per Second. Transmission rate of binary numbers. Compare with Baud. Break A special, non-data signal used by computer equipment to interrupt some processes. Buffer Temporary storage area used to compensate for a difference in the rate of data flow into and out of a device.
Character Set The characters that can be coded or used by a particular machine. Clear to Send (CTS) An RS-232 control signal sent by the DCE to indicate that the DTE may begin a transmission. Clock Source of timing signals used in synchronous transmission. Code A predefined set of rules specifying the way data is to be represented by the transmitting and receiving device. Common Carrier Telephone company that furnishes communications services to the general public.
Glossary Control Character Any character assigned as ASCII numeric code less than the SPACE character. These characters are used to initiate a control function on the receiving device. Also a symbol you can create by pressing one of your computer’s keys while holding down the Control key. These symbols are not usually printed, and are generally used to control screen formatting and cursor positioning. CPU Central Processing Unit.
Data Communications Equipment Equipment that is used to access a communications network. The DCE provides all the functions required to establish, maintain and terminate a connection, and provides the signal conversion required for communications between the Data Terminal Equipment (DTE) and the telephone network. With RS-232 connections, the modem is generally the DCE device while the computer or terminal connected to a modem is generally the DTE device. See also Data Terminal Equipment.
Glossary Default A value, action or setting that is automatically used by a computer system when no other explicit information has been given. Demodulate To recover the information being transmitted by a modulated signal. For example, a conventional radio receiver demodulates an incoming broadcast signal top convert it into sound emitted by a speaker. See also Modulate and Modem. Device A piece of equipment connected to a computer — maybe a Fax Card or Modem.
Double-Digit Keying Pressing two number keys in rapid succession to access a page in a videotex system. The first number accesses an intermediate index (see Intermediate Page) which in turn accesses the page. See also Single-Digit Keying. Dumb Terminal Terminals that do not contain an intelligent microprocessor and usually send data one character at a time. Duplex Transmission Independent, simultaneous, two-way transmission. E EBCDIC Extended Binary Coded Decimal Interchange Code.
Glossary ENQ Control character used to enquire as to the identification or status of a remote device. Even Parity Even parity refers to the addition of a 0 value or 1 value bit to the data bits which form a character to cause an even number of 1 value data bits to be sent. See also Parity. ETX Control character which indicates the End of Text in a transmitted message. F Firmware Computer program stored permanently in Read Only Memory.
Graphics Information in the form of pictures or images. Also, the display of pictures or images on a computer’s display screen. Guard Band Narrow frequency band left unused between adjacent channels to minimize interference. H Half Duplex Data transmission in which data may flow in either direction at one time, but not both directions simultaneously. Transmission direction is alternatively switched to allow two way flow of data.
Glossary Header In communications protocols, this is the control information that precedes the message or text portion of a block of data. Hertz (Hz) Unit of frequency, one cycle per second. Horizontal Redundancy Checking (HRC) Technique in which redundant information is included with a block of data for validating the transmitted data at the receiving end. Host Computer A computer that manages information for many terminals. A host computer may be mainframe, minicomputer or a microcomputer.
I/O Input/Output. The transfer of information into and out of a computer. ISO International Standards Organization. ITU International Telecommunications Union (formerly known as CCITT). ITU is the principal communications standards organisation. J Jack A socket used for telephone line or other electrical connections. K Kermit Kermit is a file transfer protocol developed for operating systems which could not support the XModem protocol. Kermit was developed at Columbia University in 1981.
Glossary Log on To connect to or access a bulletin board or videotex system. Log Off To disconnect from a bulletin board or videotex system. Longitudinal Redundancy Check Error detection technique that consists of a byte where each bit is calculated on the basis of the parity of all bits in the block in the same position. Loopback Directing signals back toward the source at some point in the communications path.
Multidrop Line Single communications circuit interconnecting many stations (nodes) each containing terminal devices. Multiplex To interleave or simultaneously transmit two or more messages on a single channel. N NAK Negative Acknowledgement. This control character indicates that the last block transmitted was in error and that the receiver is expecting a retransmission. Node A point of interconnection on a circuit.
Glossary Packet Switched Network System where messages are transmitted in packets, each individually addressed and routed through the network. Packetised Ensemble Protocol (PEP) A patented data transmission technique used by the TrailBlazer modem to transmit data at up 18000 bps on the switched telephone network. Parity A simple method of error checking by which the number of data bits received are added together to ensure that the correct number have been received.
PROM Programmable Read Only Memory. Propagation Delay The time required for a signal to travel from one end of a circuit to another. Protocol A set of conventions controlling the timing and format of data communications between two pieces of communications equipment. Protocol Convertor Device that converts from one protocol to another. Public Domain Software Software from which its author has relinquished copyrights. This software is free of charge and may be distributed for non-commercial purposes.
Glossary Remote System Usually a bulletin board or videotex system that registered users or the public can dial up and communicate with via modem. Request to Send RS-232 control signal by the DTE to inform the DCE that it is ready to transmit data. When used for flow control between the DTE and the modem, this signal indicates to the modem that the DTE is ready to accept data. Ring Indicator RS-232 control signal used by the DCE to inform the DTE that it is receiving a ringing signal. ROM Read Only Memory.
topic. Often SIGs set up bulletin boards, available only to SIG members. Simplex Data communications in one direction only. Single-Digit Keying Refers to videotex systems where you only need to press one numeric key from an index. See also Double-Digit Keying. Software Computer program or set of computer programs held in storage, and loaded into RAM for execution. Software Downloading Known as software downloading or teleloading on videotex systems and downloading on some bulletin boards.
Glossary portion of the data block. SYN Synchronous Idle control character transmitted when the line is idle in synchronous transmissions. Synchronous A data transmission in which the time between characters is fixed by synchronising the transmitting and receiving communications equipment. The clock signal is typically derived from the data stream in order to maintain synchronisation. Sysop System Operator. This is the person or organisation who controls and maintains a videotex or bulletin board system.
The message portion of a data block in synchronous data transmissions. Turnaround Time The time required to reverse the direction of transmission when operating in half duplex mode. U Upload Refers to sending files or text from the user’s computer to another user, a bulletin board or videotex system. (Many bulletin boards that offer public domain software encourage users to upload their own programs so that other users can download them).
Glossary An extension of the original XModem transfer protocol. Added features included transfer of file names, multi-file transfers, increased reliability of error checking and increased data throughput. Z ZModem Designed to rectify some of the limitations associated with YModem as well as providing support for high speed, packet and network communications environments.
Specifications Dimensions Height: 31mm Length: 218mm Width: 122mm Communications V.90 56,000bps (K56Flex proprietary standard) ITU-T 33600bps ITU-T 31200bps ITU-T V.34 (2400-33600bps) ITU-T V.32bis (14400bps) ITU-T V.32bis (1200bps) ITU-T V.32 (9600bps) ITU-T V.32 (7200bps) ITU-T V.32 (4800bps) ITU-T V.22bis (2400bps) ITU-T V.22 (1200bps) ITU-T V.23 (1200/75bps) ITU-T V.21 (300bps) Bell 212A (1200bps) Bell 103 (300bps) ITU-T V.17 (fax 12,000-14,400bps) ITU-T V.29 (fax 7200-9600bps) ITU-T V.
Specifications Data Formats Synchronous, Asynchronous: 7/8 data bits Flow Control RTS/CTS, XON/XOFF and Transparent XON/XOFF (async mode only) Error Correction V.42, MNP 2-4, MNP10 Data Compression V.
Product Warranty Telenetics warrants that the Product sold will be free from defects in material and workmanship and perform to Telenetics’ applicable published specifications for a period of 18 months from the date of delivery to Customer or 12 months from placement into service, whichever occurs first. The liability of Telenetics hereunder shall be limited to replacing or repairing, at its option, any defective Products which are returned F.O.B.
RMA Procedure RMA Procedure Return Merchandise Authorization (RMA) Procedure Before returning any Telenetics product, an RMA number must be obtained. Before asking for an RMA number, ascertain that the product was purchased from Telenetics. If you bought the product from a Distributor or Systems Integrator, the product should be returned to that vendor. The most convenient method to obtain an RMA number for a product purchased from Telenetics is to send an email to support@telenetics.com.
Compliances This device complies with Part 15A of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15A of the FCC Rules.
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