CMM 900-3W USER GUIDE AMPS Cellular Modem Module (3W) Page 1 of 1
Table of Contents 1. PRODUCT OVERVIEW ............................................3 1.1 Features: ..................................................................................... 3 1.2 Serial Port Pins: .......................................................................... 5 1.3 Applications:................................................................................ 5 1.4 Your package includes: .............................................................. 5 2. SPECIFICATIONS ...............
1. PRODUCT OVERVIEW The Cellular Modem Module, CMM 900-3W, uses the Advanced Mobile Phone System (AMPS) cellular network for data transmission. AMPS is the cellular system used in North America, Latin America, Australia, New Zealand and parts of Africa. AMPS system is not compatible with the digital systems, such as GSM (Global System for Mobile Communications). CMM 900-3W has RS232 interface and supports the popular AT command set normally associated with modems. Optionally TTL interface is also available.
• Requires 5 Volts DC @ 1500 ma Page 4 of 4
1.2 Serial Port Pins: (RS 232 interface) Figure 2. DB9 Female RS-232 DCE Interface Pin No. 1 Signal Name DCD Input/Output Output 2 3 4 5 6 RXD TXD DTR GND DSR Output Input Input 7 8 RTS CTS Input Output 9 RI Output Output 1.3 Applications: Example applications for data communications with CMM 900-3W include: • • • • • Packet Data Radio SCADA and Telemetry Systems Remote gas/water/electric meter readings. Factory Automation systems Vending Machines 1.
2. SPECIFICATIONS Air Speed Up to 9600 bps DTE Rate Data Compression & Error Detection 300, 1200, 2400, 9600, 19200, 57600 bps (DIP switch selectable) MNP2-5, V42, V42bis, MNP 10 Transmit Power Power Supply Interface Signals supported Operating Temperature Range Custom Configurations 3W 5 volts DC @ 1500 ma RS 232 Asynchronous TXD, RXD, CD, DSR, RTS, CTS, RI, DTR -10 °C to +70 °C Yes 3.0 MODEM SETUP AND REGISTRATION 3.
It is recommended that the MIN and SID information be stored in an easy to access location. 4. STARTING AND CONFIGURING THE MODEM The Cellular Modem is configured as a DCE (e.g. modem). It communicates with a PC through the serial (RS 232) port. 4.1 DIP Switch Settings: DIP Switch 1 2 3 4 5 6 7 8 Position ON ON ON ON ON ON ON ON Note 1 DTE speed 300 baud 1200 baud 2400 baud 9600 baud 19200 baud 57600 baud Hardware Handshake Software Handshake Note 1: “ON” = Down position 4.
Step 8: Step 9: Step 10: Step 11: Step 12: Step 13: Step 14: Step 15: Step 16: Parity: None Stop Bits: 1 Flow Control based on the CMM 900-3W switch settings Click OK. Select Call>Disconnect Select Call>Connect Select File>Properties>Settings>ASCII setup Check the following: In the ASCII Sending field, check Echo typed characters locally. In the ASCII receiving field, check Append line feeds to incoming line ends and Wrap lines that exceed terminal width. Click OK twice.
Step 1: Enter ATDT XXXX XXXX is the phone number of the modem you are calling. After approximately 30 seconds, the Cellular Modem responds with CONNECT message. Step 2: Type “ Hello” The party you called should see the message on their terminal screen. Step 3: Ask the called party to type a message and you should see that message on your terminal screen. Step 4: Enter the Escape sequence +++. The modem responds OK.
Note: Commands entered incorrectly or with out-of-range parameters will result in an “ERROR” message. Commands entered correctly will result in “OK” message.
5.1.2 Result Codes Result Codes refer to the responses of the cellular modem unit to a command. Unless the cellular modem has been programmed to be in the Quiet mode (Section 6.1), the unit will respond each time a command is issued. The default mode of the cellular modem is the verbose mode. The responses in the verbose mode are characters. Using AT commands, the modem can be put into terse (non-verbose) mode. The responses in non-verbose mode are numerical digits.
5.2 On-line State: In Online state, input(s) from the PC is treated as data to be transmitted over the airwaves, and input(s) from the airwaves is treated as received data from the remote end. The cellular modem is in online state in one of the two conditions: • Cellular modem dials out and a successful connection is established. • Cellular modem answers an incoming call and a successful connection is established. When the cellular modem is in “Online” state.
6. SUPPORTED AT COMMANDS This section describes the basic “AT” commands used to configure the cellular modem. These commands are a subset of the commands used in typical high-speed modems. A command line is a string of characters sent from the DTE (e.g. a PC) while the modem is in Command State. A command line has a prefix, a body and a terminator. Each command line must begin with a character sequence AT and must terminate with a carriage return.
ATQ1 ATQ1&W&W1 AT&V ATI3 ATH0 ATV0 ATV0&W&W1 ATV1 ATV1&W&W1 ATS0 +++ information. Note: MIN, ESN, SID information are stored in the Non-volatile memory of the cell-modem and do not need to be entered on every Powerup. To exit Test mode, enter AT+MODE=02 Unit does not respond with OK or non-verbose messages. This is ideal for in situations where the Data Link is connected to a “non-intelligent” host. This mode is also called Quiet Mode. Q1 instruction stored in non-volatile memory.
7. TROUBLESHOOTING 1. If the unit draws too much power. Please ensure that the correct power supply is used and correctly wired. 2. If dialing out is repeatedly unsuccessful and the modem gives “NO DIAL TONE” message, please check that the mobile service is available. 3. If the unit never connects on dialing out, please ensure that the ESN (Electronic Serial Number) and the MIN numbers are correct. 4. Please check RSSI level. If it is low (< -95 dbm), positioning the antenna vertically should improve it. 5.
8. FREQUENTLY ASKED QUESTIONS (FAQ) Q1: A1: What is the flow control method recommended? If the host is a PC, Hardware flow control is recommended. However, in most control instrumentation, either software or no flow control is called for. Q2: A2: How do I disable any flow control? Simply disable both the Hardware and software control switch settings. This is not recommended for large file transfers. Q3: I need to connect the Cellular Data Link to a machine, which does not understand your messages.
Q8: A8: Is there any recommended init string for various land line mode. The following have been tried with excellent results.
