56K Voice Faxmodem Internal User’s Guide PN 1.024.
This manual covers installation and operating instructions for the following 3Com U.S. Robotics modem: 56K* Voice Faxmodem Internal * IMPORTANT! In accordance with the ITU standard for V.90 transmissions, this modem is capable of 56 Kbps downloads. However, the download speeds you experience may be lower due to varying line conditions and other factors. Uploads from users to server equipment travel at speeds up to 31.2 Kbps. An analogue phone line compatible with the ITU V.
Table of Contents WELCOME TO 56K INFORMATION ACCESS......................................1 PRODUCT FEATURES .......................................................................2 INTERNAL MODEM INSTALLATION WITH WINDOWS 95...................5 DETERMINING AVAILABLE RESOURCES ....................................................5 DETERMINING YOUR VERSION OF W INDOWS 95.........................................6 PLUG AND PLAY INSTALLATION ............................................................
Table of Contents TECHNICAL REFERENCE ................................................................ 51 TYPING COMMANDS.......................................................................... 51 BASIC DATA COMMANDS .................................................................. 51 EXTENDED DATA COMMANDS ............................................................. 57 S-REGISTERS.................................................................................. 64 FAX COMMANDS .........................
Welcome to 56K*Information Access The International Telecommunications Union (ITU) decides the technical protocols that communications devices must use to operate with each other. Modems that comply with ITU standards can “talk” to other standards-compliant modems and fax machines worldwide. The ITU has determined a worldwide standard for 56K modem technology. With a U.S. Robotics modem, you can get 56K Internet access from any service provider who offers the ITU V.
Product Features Modulation Schemes ITU-T V.90 x2™ technology (Download up to 56kbps, and Upload using V.34) ITU-T V.34+ ITU-T V.34 ITU-T V.32bis ITU-T V.32 ITU-T V.23 ITU-T V.22bis ITU-T V.22 Bell 212A ITU-T V.21 Bell 103 Error Control and Data Compression Schemes ITU-T V.42 ITU-T V.42bis MNP 2-5 Fax Modulation Schemes ITU-T V.17 ITU-T V.29 ITU-T V.27ter ITU-T V.21 Fax Standards EIA 578 Class 1 FAX EIA 592 Class 2.
Product Features Back Channel Link Rates (Upload Speeds) 4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000, 26400, 28800, 31200 V.34+ Link Rates 4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000, 26400, 28800, 31200, 33600 V.32bis Link Rates 4800, 7200, 9600, 12000, 14400 Additional Link Rates 300, 1200/75 (V.
Product Features Flash ROM Upgradable 56K Voice Faxmodem Internal supports software download through flash memory. You can obtain the latest features by downloading updates quickly and easily. Speakerphone* With the addition of an inexpensive set of externally powered speakers, your new voice modem provides all the convenience of a full-duplex speakerphone. Unlike many half-duplex speakerphones, your modem allows you to converse normally without annoying echoes and distortion.
Internal Modem Installation with Windows 95 Before you start your installation, make sure that you have the following items: Modem U.S. Robotics Disk RJ-11 Phone Lead Tail Lead Microphone Analogue (Standard) Telephone Wall Socket Phillips Head Screwdriver or ¼” Hex Screwdriver Data/Fax/Voice Communications Software and Manual Determining Available Resources Your U.S. Robotics modem is a Plug and Play device.
Internal Modem Installation with Windows 95 You will see the IRQs your system is currently using. If IRQs 3, 4, 5, and 7 are being used, you need to free an IRQ before you begin installation. This process involves moving a device from the IRQ you want to use to a different (and usually higher) IRQ setting.
Internal Modem Installation with Windows 95 Plug and Play Installation This modem’s factory default setting is “Plug and Play” operation. If you are using the Windows 95 environment, the COM port and IRQ will automatically be set to Windows as the environment. Since your new U.S. Robotics modem is a “Plug and Play” device, Windows 95 may be able to detect your modem automatically after you plug it into your computer. The operating system should do all the work of recognising the modem for you.
Internal Modem Installation with Windows 95 4. When doing a “Plug and Play” installation, the jumper shunts should be placed so that they are hanging from single jumper pins rather than on pairs of pins. Move your jumper shunts so they are hanging as in the diagram. If you need to move the jumper shunts, grasp them with tweezers or needle-nosed pliers. DO NOT grasp too firmly, however, or you may crush the jumper shunts. If a jumper shunt seems stuck, try gently rocking it back and forth as you lift.
Internal Modem Installation with Windows 95 4. Remove the screws from your computer’s cover and then remove the cover, as shown in the following diagrams. Your computer may differ in appearance from these diagrams, but the basic principle for removing the cover should be the same. Refer to your computer manufacturer’s manual if you need further instructions. 5. Find an empty ISA expansion slot that’s at least as long as the gold edge of your modem. (ISA slots are dark plastic grooves lined with metal.
Internal Modem Installation with Windows 95 6. Holding the modem by each corner, align the gold edge with the empty expansion slot. Push down gently until the modem snaps into the slot. The diagram shows horizontally aligned expansion slots. Some computers have vertically aligned slots. The instructions apply to both styles. You need to apply a little pressure to seat the modem properly. Sometimes a gentle back and forth motion helps fit the modem all the way into the slot.
Internal Modem Installation with Windows 95 56K Voice Faxmodem Internal - User’s Guide 11
Internal Modem Installation with Windows 95 You cannot use the modem and a phone at the same time if they share the same telephone line. If you want to use a telephone on the same line as the modem when the modem is not in use, plug your telephone cord into the modem’s PHONEsocket, using the supplied Tail Lead Adaptor. 12. An external, powered speaker must be connected for speakerphone and voice mail usage.
Internal Modem Installation with Windows 95 Installing Modem Drivers with Windows 95: Versions 950 and 950a Moving Through the “New Hardware Found” Screens 1. When Windows 95 starts, it should detect the modem. If it does, you will see the following screen. Click Driver from disk provided by hardware manufacturer. Then click OK. If this screen does not appear, go to “If Plug and Play Does Not Detect Your Modem” on page 37. 2.
Internal Modem Installation with Windows 95 3. Once Windows finishes loading the information from the disk, verify that the modem installation was a success. When your desktop returns, click the Windows Start button and point to Settings. Then click Control Panel. 4. Double-click the Modems icon (circled in the screen image below).
Internal Modem Installation with Windows 95 5. In the “Modems Properties” screen, you should see a description for your modem. This means the installation was a success. Click OK. If you do not see your modem listed in the preceding screen, the Plug and Play installation was unsuccessful. Please refer to “If Plug and Play Does Not Detect Your Modem” on page 37. 6. Next, click the Diagnostics tab at the top of the “Modems Properties” screen. Write down the COM setting for your modem in the space below.
Internal Modem Installation with Windows 95 6. Click More Info…. Click OK. Turn to “Software Installation” on page 29 for information about installing communications software.
Internal Modem Installation with Windows 95 Installing Modem Drivers with Windows 95: Version 950b Using the Update Device Driver Wizard Screens 1. Start Windows. Insert the U.S. Robotics disk into your disk drive. Click Next. If this screen does not appear, go to “If Plug and Play Does Not Detect Your Modem” on page 37. 2. When you see the following screen, click Finish.
Internal Modem Installation with Windows 95 3. Now you should verify that the modem installation was a success. When your desktop returns, click the Windows Start button and point to Settings. Then click Control Panel. 4. Double-click the Modems icon (circled in the screen image below).
Internal Modem Installation with Windows 95 5. In the “Modems Properties” screen, you should see a description of your modem. This means the installation was a success. Click OK. If you do not see your modem listed in the preceding screen, the Plug and Play installation was unsuccessful. Please refer to the “If Plug and Play Does Not Detect Your Modem” section on page 37. 6. Next, click the Diagnostics tab at the top of the “Modems Properties” screen. Write down the COM setting for your modem in the space.
Internal Modem Installation with Windows 95 7. Click More Info…. Click OK. Turn to “Software Installation” on page 29 for information about installing communications software.
Internal Modem Installation with Windows 3.x Before you start your installation, make sure that you have the following items: Modem U.S. Robotics Disk RJ-11 Phone Lead Tail Lead Microphone Analogue (Standard) Telephone Wall Socket Phillips Head Screwdriver or ¼” Hex Screwdriver Data/Fax/Voice Communications Software and Manual A Word about COM Ports and IRQs Most computer accessories — a mouse, sound card, enhanced graphics card, scanner, etc.
Internal Modem Installation with Windows 3.x Accessories cannot share COM ports and should not share IRQs. When accessories try to share settings, they will either not work properly or not work at all. 3Com has set your modem to a default Plug and Play setting geared towards Windows 95 users.
Internal Modem Installation with Windows 3.x The jumper shunts will be hanging from single jumper pins as shown in the following illustration. 4. To change the COM port and IRQ settings, you need to reposition the jumper shunts on the COM port and IRQ pins. To do this, lift the jumper shunts off the pins. Grasp the jumper shunts with a tweezers or needle-nosed pliers. DO NOT grasp too firmly, as you may crush the shunts. If a jumper shunt seems stuck, gently rock it back and forth as you lift.
Internal Modem Installation with Windows 3.x The following are recommended combinations of COM port and IRQ settings when not using Plug and Play: COM 1, IRQ 4 or COM 2, IRQ 3 Most computers provide you with COM1 and COM2. If you do not use either of these two ports, you may disable them either in your computer's BIOS or with jumpers (refer to the manual of your PC).
Internal Modem Installation with Windows 3.x 2. Turn off your computer and unplug it from the electrical outlet. 2.3.Unplug any peripheral devices (printer, monitor, keyboard, mouse, etc.) from the computer. CAUTION: To avoid risk of electric shock, make sure your computer and all peripheral devices are turned off and unplugged from electrical outlets. 4. Remove the screws from your computer’s cover and then remove the cover, as shown in the following diagrams.
Internal Modem Installation with Windows 3.x 5. Find an empty ISA expansion slot that’s at least as long as the gold edge of your modem. (ISA slots are dark plastic grooves lined with metal.) Unscrew and remove the expansion slot cover. It is the long narrow piece of metal that keeps dust from entering through the opening perpendicular to the slot. 6. Holding the modem by each corner, align the gold edge with the empty expansion slot. Push down gently until the modem snaps into the slot.
Internal Modem Installation with Windows 3.x 7. Once the modem is inserted, fasten it firmly into place using the screw that you removed in step 5. 8. Replace the computer’s cover and fasten it with the screws you removed in step 4. 9. Locate the phone wall socket you plan to use for the modem. If you have a phone plugged into this wall socket, disconnect the telephone cord from the socket. The phone wall socket you use must be for an ANALOGUE phone line (the type found in most homes).
Internal Modem Installation with Windows 3.x 14. Plug the power cords, cables, and peripherals back into the computer and turn on the computer. 15. Start Windows 3.x. 16. If you have your modem set to COM1/IRQ4 or COM2/IRQ3, go to “Software Installation” on page 29. If you have your modem configured to any other setting, open Program Manager and double-click the Main icon. 17. Double-click the Control Panel icon. 18. Double-click the Ports icon. 19.
Internal Modem Installation with Windows 3.x 20. Set the Baud Rate to the highest option and Flow Control to Hardware. Then click Advanced. 21. In the Interrupt Request Line (IRQ) box, select the IRQ. 22. Click OK. 23. You will see a screen prompting you to restart Windows. Click Restart Now. Turn to “Software Installation” on page 29 for information about installing communications software.
Software Installation Voice Fax, Data, and Telecommunications Software (communications software) allows sending and receiving faxes directly from your computer desktop. You can build your own fax directory, send faxes to specified groups of fax numbers, select individual cover pages when necessary, and send individual faxes without exiting your word processing program. Communications software allows you to change settings and issue commands to your modem.
Software Installation Refer to your software manual for the specific installation instructions. The software’s installation program will ask you questions about the modem you are using. You may need the following information when installing a communications software package. Type of Modem Most voice communications software programs will ask you to select the type of modem you are using. Select a U.S. Robotics high speed modem. If that selection is not listed, pick Courier Dual Standard, V.32bis, or V.34.
Software Installation Read This First! 1. Click Windows Start, point to Settings, and click Control Panel. 2. Double-click the Modems icon. 3. Click the Diagnostics tab. 4. Click on the COM port that your modem is assigned to, so that it is highlighted. (If you do not see your modem on this screen, you will need to shut down your computer and uninstall the modem. Reinstall the modem following the instructions in the Installation Guide.) 5. Click More Info. You should see a list of the modem’s ATI commands.
Troubleshooting POSSIBLE SOLUTION You may have a COM port/IRQ conflict. If you have an internal modem and a Windows 95 system, right-click on the My Computer icon on your desktop. Click Properties. Click the Device Manager tab. If you see a yellow exclamation point over your modem, you have a resource conflict, and it is probably an IRQ conflict. Click the modem’s name to select it. Then click Remove. You will be asked if you are sure you wish to remove the device. Click OK.
Troubleshooting POSSIBLE SOLUTION You may have plugged your modem’s phone cord into the wrong jack on the modem. Make sure the phone cord is plugged into a jack labeled with the word TELCO (marked with a wall jack icon on externals). POSSIBLE SOLUTION You might have a bad phone cord connection to your modem. The phone cord should be plugged into the TELCO jack on the modem (marked with a wall jack icon on externals) and the wall phone jack. The phone cord should be no longer than 12 feet in length.
Troubleshooting PROBLEM: Both modems sound like they are exchange carrier signals, but fail to establish a connection. POSSIBLE SOLUTION You may have a poor line connection. Place the call again. Calls are routed differently each time. POSSIBLE SOLUTION Your phone jack may have been wired incorrectly. Contact your telephone company. Ask them to make sure the tip and ring are on the inside pair of wires. PROBLEM: Your 56K modem cannot achieve a 56K Internet connection.
Troubleshooting PROBLEM: Errors are constantly occurring in your V.17 fax transmissions. POSSIBLE SOLUTION Your modem initialisation string may be insufficient for fax transmissions. In terminal mode, type the following initialisation string: AT&F&H3&I2&R2S7=90 and then press ENTER. The standard string for faxing is AT&F1S36=0 POSSIBLE SOLUTION There may be a Terminate and Stay Resident (TSR) program (such as a screen saver or virus scanner) running in the background, disrupting data communications.
Troubleshooting 56K Voice Faxmodem Internal - User’s Guide 37
Troubleshooting PROBLEM: If Plug and Play does not detect your modem. You have installed the modem and Windows has restarted, but you see only your normal desktop. You do not see any screens indicating new hardware has been detected. POSSIBLE SOLUTION The Plug and Play installation was not successful. Try the following: 1. Click Windows 95 Start and click Shut Down. When asked if you wish to shut down your computer, click Yes.
Support Resources Connecting to the 3Com Bulletin Board System (BBS) To connect to the 3Com BBS, dial 33320910308. If this is your first time connecting to our BBS, you will be asked to enter your name, create a password of your choice, and to fill out a questionnaire. Internet FTP The Internet FTP provides free library containing the same files as the BBS site. To access the FTP site type ftp.usr.com.
Support Resources Are You Still Having Problems? • • • Review this manual. Contact your local reseller/dealer who may be able to provide you with the necessary assistance. If your reseller/dealer cannot help you, contact 3Com Customer Support. When you call, specify your modem serial number (found on the outside of the box), the software being used, and if possible, the contents of your ATI7 screen.
Glossary Cross references are printed in boldface. Cross references with items in the Technical Reference section are printed in italics. analogue loopback A modem self-test in which data from the keyboard or an internal test pattern is sent to the modem's transmitter, turned into analogue form, looped back to the receiver, and converted back into digital form.
Glossary certain number of rings. See S-register (S0) in the Technical Reference section.
Glossary auto dial A process where your modem dials a call for you. The dialling process is initiated by sending an ATDT (dial tone) or ATDP (dial pulse) command followed by the telephone number to dial. Auto Dial is used to dial voice numbers. See command Dn. baud rate A term used to measure the speed of an analogue transmission from one point to another. Although not technically accurate, baud rate is commonly used to mean bit rate.
Glossary character A representation, coded in binary digits, of a letter, number, or other symbol. characters per second (CPS) A data transfer rate generally estimated from the bit rate and the character length. For example, at 2400 bps, 8-bit characters with start/ stop bits (for a total of ten bits per character) will be transmitted at a rate of approximately 240 characters per second (cps).
Glossary DCE Data Communications (or Circuit-Terminating) Equipment is equipment such as dial-up modems that establish and control the data link via the telephone network. default Any setting assumed, at startup or reset, by the computer's software and attached devices. The computer or software will use these settings until changed by the user or other software. detect phase In the ITU-T V.42 error-control protocol, the first stage in establishing if both modems attempting to connect have V.42 capability.
Glossary error control A variety of techniques that check the reliability of characters (parity) or blocks of data. V.42 and MNP error-control protocols use error detection (CRC) and retransmission of flawed frames (ARQ). facsimile A method for transmitting the image on a page from one point to another. This is commonly referred to as fax. fax mode The mode in which the faxmodem is capable of sending and receiving files in a facsimile format. See definitions for V.17, V.27ter, V.29.
Glossary ITU-T An international organisation that defines standards for telegraphic and telephone equipment. For example, the Bell 212A standard for 1200 bps communication in North America is observed internationally as ITU-T V.22. For 2400 bps communication, most U.S. manufacturers observe V.22 bis. The initials ITU-T represent the ‘International Telecommunications Union - Telecommunications sector’. LAPM Link Access Procedure for Modems is an error-control protocol defined in ITU-T Recommendation V.42.
Glossary online fallback/fall forward A feature that allows a high-speed, error-control modem to monitor line quality and fall back to the next lower speed in a defined range if line quality diminishes. As line conditions improve, the modem switches up to the next higher speed. originate mode The mode used by your modem when initiating an outgoing call to a destination modem. The transmit/receive frequencies are the reverse of the called modem, which is in answer mode.
Glossary ROM Read Only Memory is permanent memory, which is not userprogrammable. serial transmission The consecutive flow of data in a single channel. Compare to parallel transmissions where data flows simultaneously in multiple channels. start/stop bits These signalling bits attached to a character before and after the character is transmitted during asynchronous transmission. terminal A device whose keyboard and display are used for sending and receiving data over a communications link.
Glossary V.22 An ITU-T standard for modem communications at 1200 bps, compatible with the Bell 212A standard observed in the U.S. and Canada. V.22 bis An ITU-T standard for modem communications at 2400 bps. The standard includes an automatic link negotiation fallback to 1200 bps and compatibility with Bell 212A/V.22 modems. V.23 An ITU-T standard for modem communication at 1200 bps with a 75 bps back channel. This standard is used in the U.K. V.
Glossary V.42 An ITU-T standard for modem communications that defines a two-stage process of detection and negotiation for LAPM error control. V.42 bis An extension of ITU-T V.42 that defines a specific data compression scheme for use during V.42 connections. Xmodem The first of a family of error control software protocols used to transfer files between modems. These protocols are in the public domain and are available from many bulletin board services.
Technical Reference Typing Commands • • • • Type commands in either upper or lower case, not a combination. Use the Backspace key to delete errors. (You cannot delete the original AT command since it is stored in the modem buffer.) If a command has numeric options and you do not include a number, zero is assumed. For example, if you type ATB, the command ATB0 is assumed. Every command except A/, +++, and A> must begin with the AT prefix and be entered by pressing ENTER.
Technical Reference Any key Aborts off-hook dial/answer operation and hangs up. AT Required command prefix, except with A/, +++, and A>. Use alone to test for OK result code. Bn U.S.
Technical Reference Hn Controls ON/OFF hook H0 H1 In Displays the following information I0 I1 I2 I3 I4 I5 I6 I7 I9 I11 Ln Low volume Low volume Medium volume High volume Operates speaker M0 M1 M2 M3 On Four-digit product code Results of ROM checksum Results of RAM checksum Product type Current modem settings Nonvolatile memory (NVRAM) settings Link diagnostics Product configuration Plug and Play information Extended link diagnostics Controls speaker volume (internals only) L0 L1 L2 L3 Mn Hangs up
Technical Reference Sr.b=n Sets bit .b of register r to n (0/OFF or 1/ON) Sr=n Sets register r to n.
Technical Reference Xn Sets result code displayed, default is X4 Xn Setting Result Codes 0/OK 1/CONNECT 2/RING 3/NO CARRIER 4/ERROR 5/CONNECT 1200 6/NO DIAL TONE 7/BUSY 8/NO ANSWER* 9/Reserved 10/CONNECT 2400 11/RINGING 13/CONNECT 9600 18/CONNECT 4800 20/CONNECT 7200 21/CONNECT 12000 25/CONNECT 14400 43/CONNECT 16800 85/CONNECT 19200 91/CONNECT 21600 99/CONNECT 24000 103/CONNECT 26400 107/CONNECT 28800 151/CONNECT 31200 155/CONNECT 33600 56 X0 X1 X2 X3 X4 • • • • • • • • • • • • • • • • • • • • •
Technical Reference Xn (Continued) Result Codes 256/CONNECT 28000 260/CONNECT 29333 264/CONNECT 30666 268/CONNECT 32000 180/CONNECT 33333 272/CONNECT 34666 276/CONNECT 36000 184/CONNECT 37333 280/CONNECT 38666 284/CONNECT 40000 188/CONNECT 41333 192/CONNECT 42666 196/CONNECT 44000 200/CONNECT 45333 204/CONNECT 46666 208/CONNECT 48000 212/CONNECT 49333 216/CONNECT 50666 220/CONNECT 52000 224/CONNECT 53333 228/CONNECT 54666 232/CONNECT 56000 236/CONNECT 57333 Xn Setting X0 X1 X2 X3 X4 • • • • • • • • •
Technical Reference Yn Selects power-on/reset default configuration Y0 Y1 Y2 Y3 Y4 Z Use profile 0 setting in NVRAM Use profile 1 setting in NVRAM Use factory configuration 0 Use factory configuration 1 Use factory configuration 2 Resets modem Z0 Z1 Z2 Z3 Z4 Z5 Resets modem to NVRAM profile selected by Y command or dip 7 Resets modem to NVRAM profile 0 Resets modem to NVRAM profile 1 Resets modem to factory default profile 0 (&F0) Resets modem to factory default profile 1 (&F1) Resets modem to factory
Technical Reference &Dn Controls Data Terminal Ready (DTR) operations &D0 &D1 &D2 &D3 &Fn Loads a read-only (non-programmable) factory configuration &F0 &F1 &F2 &Gn &G2 Software flow control disabled XON/XOFF signals to your modem and remote system XON/XOFF signals to your modem only Enables/disables data compression &K0 &K1 &K2 &K3 &Mn Flow control disabled Hardware flow control, Clear to Send (CTS) Software flow control, XON/XOFF Hardware and software flow control Sets Receive Data (RD) software
Technical Reference &Nn Sets connect speed, if connection cannot be made at this speed, the modem will hang up. When used in conjunction with &Un and &Un is greater than 0, &Nn sets the ceiling connect speed. &Un sets the floor connect speed. (See also the table in the &Un section.
Technical Reference &Nn (Continued) &N30 &N31 &N32 &N33 &N34 &N35 &N36 &N37 &N38 &N39 &Pn Sets pulse (rotary) dial make/break ratio &P0 &P1 &Rn Reserved Modem ignores RTS Received Data to computer only on RTS Controls Data Set Ready (DSR) operations &S0 &S1 &Tn U.S./Canada ratio, 39%/61% U.K.
Technical Reference &Un Sets floor connect speed when set above 0, if the connection cannot be established above this speed, the modem will hang up. When &Un is used in conjunction with &Nn and &Nn is greater than 0, &Nn is the ceiling connect speed. &U=0 &U>0 &N=0 Connects at best possible speed between your modem and the remote modem Note: These factory default settings should be sufficient for most users. &N>0 Connects at speed defined by &Nn.
Technical Reference &Un (Continued) &U22 &U23 &U24 &U25 &U26 &U27 &U28 &U29 &U30 &U31 &U32 &U33 &U34 &U35 &U36 &U37 &U38 &U39 &Wn Writes current configuration to NVRAM templates &W0 &W1 &Yn 34666 bps 36000 bps 37,333 bps 38666 bps 40000 bps 41,333 bps 42,666 bps 44,000 bps 45,333 bps 46666 bps 48000 bps 49333 bps 50666 bps 52000 bps 53333 bps 54666 bps 56000 bps 57333 bps Modifies the NVRAM 0 template (Y0) Modifies the NVRAM 1 template (Y1) Sets break handling &Y0 &Y1 &Y2 &Y3 Destructive, but does not
Technical Reference 64 56K Voice Faxmodem Internal - User’s Guide
Technical Reference S-Registers To change a setting, use the ATSr=n command, where r is the register and n is a decimal value from 0 − 255 (unless otherwise indicated). Register Default Function S0 0 Sets the number of rings on which to answer in Auto Answer mode. When set to 0, Auto Answer is disabled. S1 0 Counts and stores the number of rings from an incoming call. (S0 must be greater than 0.) S2 43 Stores the ASCII decimal code for the escape code character. Default character is +.
Technical Reference Register Default S10 14 Function Sets the duration, in tenths of a second, that the modem waits to hang up after loss of carrier. This guard time allows the modem to distinguish between a line disturbance from a true disconnect (hang up) by the remote modem. Note: If you set S10 = 255, the modem will not hang up when carrier is lost. Dropping DTR hangs up the modem. S11 70 Sets the duration and spacing, in milliseconds, for tone dialing.
Technical Reference Register Default Function S13 (Continued) * The 1.5K-byte non-ARQ buffer allows data transfer with Xmodem- and Ymodem-type file transfer protocols without using flow control. The 128-byte option lets remote users with slower modems keep data you are sending from scrolling off their screens. When remote users send your computer an XOFF (Ctrl-S) and you stop transmitting, the data in transit from your modem’s buffer does not exceed the size of their screen.
Technical Reference Register Default S19 0 Sets the duration, in minutes, for the inactivity timer. The timer activates when there is no data activity on the phone line; at time-out the modem hangs up. S19 = 0 disables the timer. S20 0 Reserved S21 10 Sets the length, in 10-millisecond units, of breaks sent from the modem to the computer; applies to MNP or V.42 mode only. S22 17 Stores the ASCII decimal code for the XON character. S23 19 Stores the ASCII decimal code for the XOFF character.
Technical Reference Register Default S27 (Continued) S28 Function Bit 2 3 Value 4 8 0 Result Disables V.32 modulation. Disables 2100 Hz answer tone to allow two V.42 modems to connect faster. 4 16 Enables V.23 fallback mode. 5 32 Disables V.32bis mode. 6 64 Disable V.42 selective reject. 7 128 Software compatibility mode. This setting disables the codes and displays the 9600 code instead. The actual rate of the call can be viewed on the ATI6 screen. Used for unusual software incompatibilities.
Technical Reference Register Default S32 2 Function Bit-mapped register setup. To set the register, see the instructions for S13. Bit 0 1 2 3 4 5 6 7 S33 0 0 Value 1 2 4 8 16 32 64 128 Result Disable 2400 symbol rate. Disable 2743 symbol rate. Disable 2800 symbol rate. Disable 3000 symbol rate. Disable 3200 symbol rate. Disable 3429 symbol rate. Reserved Disable shaping. Bit-mapped register setup. To set registers, see instructions for S13. Bit 0 1 2 3 4 70 Result V.8 Call Indicate enabled.
Technical Reference Register Default S34 (Continued) Bit S35-S37 S38 S42 Value 5 6 7 Result 32 64 128 Disable TX level deviation. Disable Pre-emphasis. Disable Pre-coding. Reserved 0 S39-S40 S41 Function Sets an optional delay, in seconds, before a forced hangup and clearing of the Transmit buffer when DTR drops during an ARQ call. This allows time for a remote modem to acknowledge receipt of all transmitted data before it is disconnected. The modem immediately hangs up when DTR drops.
Technical Reference Fax Commands +FCLASS=n Sets the mode of operation FCLASS=0 Data mode FCLASS=1 Group 3 Facsimile Service Class 1 mode FCLASS? Displays the current FCLASS mode (See mode descriptions above) +FCLASS=? Displays the FCLASS mode options (See mode descriptions above) +FTS=n Stops the fax transmission. Then the modem waits for a specified time before OK appears on screen. The pause is set in 10 millisecond intervals.
Technical Reference +FTH=n Transmits data framed in the HDLC protocol using the modulation specified by n.(n = 3, 24, 48, 72, 96, 97, 98, 121, 22, 145, or 146) Note: See the “Screen Messages” table at the end of this section for an explanation of messages that appear in response to this command. +FRH=n Receives data framed in the HDLC protocol using the modulation specified by n.
Regulatory CE Compliance Electromagnetic Compatibility This device complies with the following standards in accordance with the European Directives 89/336/EEC.
Limited Warranty U.S. Robotics Access Corp., a subsidiary of 3Com Corporation, warrants to the original end-user purchaser that this product will be free from defects in materials and workmanship for the life of the modem. During the limited warranty period, and upon proof of purchase, the product will be repaired or replaced (with the same or a similar model, which may be a refurbished model) at U.S. Robotics’ option, without charge for either parts or labour.
