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
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.
The Radio starts the processing of commands only after AT string sequence is received.
Commands entered with out of range parameters will result in ERROR message. Correct commands will result in OK message in verbose mode, and 0 in terse mode.
6.1 AT Commands common to all modes:
Command | Action |
ATZ<CR> | Resets the modem. The unit responds with OK |
| message |
ATO<CR> | Go |
| changed from |
| puts the unit back into online state. |
ATDT XXXX <CR> | Cell modem dials out. XXXX is the phone number |
AT+TEST <CR> | Puts the unit in test mode. |
| Note: The commands AT+SYS, AT+MIN, |
| AT+SID and AT+ID can be entered only when |
| the unit is in the Test Mode. |
AT+SYS=xx<CR> | Sets system preference. |
| SYS =00 sets the unit for system B only |
| SYS =01 sets the unit for system A only |
| SYS =02 is for normal mode. SID determines |
| preferred system |
| SYS =03 is for home use only |
AT+RSSI<CR> | Indicates the Received signal strength. Should be > - |
| 100 dbm for reliable communication. |
AT+SER <CR> | Indicates if service is available. |
AT+MIN=XXXXX<CR> | Sets the MIN number. The modem responds OK |
AT+SID=XXXX<CR> | Sets SID. Modem responds OK |
Command | Action |
AT+ID?<CR> | Displays ESN, MIN, SID, System Preference |
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