Bolymin BETA903A, User Manual, Page: 71 / 95

BETA903A USER MANUAL - 71 -
4.4.
4.4.1.
GSM Control
Overview
User application could communicate with GSM module of BETA903A by COM1 with the
following settings:
Baud rate = 57600, Data bit = 8, Stop bit = 1, No parity.
After opening COM1, user could send AT command to control the GSM module. Here is some
AT commands used in our example application:
AT command Description
ATA Answer a call.
ATH Disconnect existing call.
ATD<n>
Set up an outgoing call.
<n>: phone number.
AT^SNFS=<n>
Set the audio mode required for the connected equipment.
The audio mode should be set to 2 for GSM module of BETA903A.
*More detailed description about AT command could be found at document “MC55i AT
Command Set” of Siemens.