FARGO electronic 1800 User Manual

Confidential, the whole present document is the sole property of Fargo Telecom (Asia) Ltd.

14

4. REMOTE AT COMMAND BY SMS

This feature is to control the modem to interpret AT command from incoming SMS, executing it,
and return the result to sender by SMS.

The user can enable the modem to receive AT command by incoming SMS. See following about
AT+SMSAT command.

1. When enabled, the modem will treat the incoming SMS as a source of AT command only if

a. The content of SMS sent to the modem is using standard 7-bit GSM data decoding scheme,
b. The first 6 characters of the SMS content matches the <key> parameter set by AT+SMSAT

command, (default key is “000000”)

c. The 7

th

 and 8

th

 characters of the SMS content is “AT” (in capital letters)

2. If SMSAT is enabled , the modem will read each incoming SMS, if the conditions mentioned in 1

are matched the message will be executed, even it is an invalid AT command

3. When using SMSAT feature, only +CNMI:x,1,x,x,x  setting could be used (i.e. incoming message

will be stored in SIM card). If the incoming SMS is treated as with AT command inside, the SMS
will be deleted after execution. If not the modem will leave it in SIM, just like normal SMS.

4. The maximum length of the AT command is limited by length of SMS, i.e. 160-6 = 154 characters

5. When the SMS AT command is executed , all intermediate and final responses will be buffered

recorded, then return to the sender’s phone number in one single SMS.

6. If response(s) of the AT command is(are) more than 160 characters, only the first 160 characters

will be returned.

7. In case the modem cannot get terminal response within 26 seconds, the modem will then abort

the command, and return intermediate responses (if present).

8. If SMSAT feature is enabled all incoming SMS, either with valid AT command or not, will be

erased. This is to prevent SIM card memory from fully filled, such the modem will not receive
new SMS.

Step 1 : send AT command

to modem by SMS

            000000AT+CSQ

Step 2 : modem execute and

return response by SMS