Multi-Tech Systems MultiModem - Manual (Page 13)

Chapter 2 – Getting Started
Multi-Tech Systems, Inc. MultiModem Wireless Modem with Ethernet Interface (S000375A) 13
Using AT Commands
Important Note: Before you can use these commands, you must complete Steps 4.1 through 4.4 on page 9.
Query Your Modem's Operation
1. Check the signal quality.
• Type AT+CSQ
Modem responds with the received signal strength (rssi).
2. Check the identity of the modem.
Use command: ATI (AT is followed by the capital letter i).
• Type ATI0 (The command ends in a zero).
Manufacturing data displays: Wavecom Modem 800 1900
• Type ATI3
Software version displays. Ex: S/W VER: xxxxx
• Type ATI6
Capability data displays. Ex: +CGSM, +CIS707, ...
3. Check the network registration and roaming status.
• Type AT+CREG?
The modem will respond in one of the following ways:
+CREG: 0,0 (this tells you the modem is not registered on any network)
+CREG: 0,1 (this tells you the modem is registered on the home network)
+CREG: 0,5 (this tells you the modem is registered on a network but it is roaming)
Set Up a Circuit-Switched Data (CSD) Connection for
CDMA and GSM
A Circuit-Switched Data Connection makes the wireless modem work like a regular analog modem. You
must have CSD service in order to make a CSD call.
1. Establish a Connection: Using HyperTerminal or a terminal application, establish a CSD connection
by entering command: ATD
Notes:
• The phone number you are calling is entered between the displayed brackets. Do not type
additional brackets. Ex: type only ATD 8585551212 between brackets.
• This command tells the modem to inform the wireless network that you are initiating a CSD modem
call. If you are dialing to another modem, the remote modem should answer and a connection
between the two modems will be established. If you include a semi-colon (;) at the end of the
dialing string, the modem will instead initiate a Voice call to the phone number dialed.
2. Disconnect: Use the following commands:
+++ Wait about 2 seconds to see OK.
Then type: ATH
Note: +++ is the escape sequence and ATH is the Hang-up command.