FARGO electronic Maestro 900 - Manual (Page 18)

Confidential, the whole present document is the sole property of Fargo Telecom (Asia) Ltd. 16
4. It could be in some case (e.g. network failure) the modem cannot return response SMS. The
modem will try sending response SMS for three times max. If still not successful it will abort.
5. Always think twice before you send AT command by SMS. For example if you send AT+CPOF it
will turn off the modem, and you need to go to access the modem to reset it.