Westermo GS-01 User Manual download pdf (Page 31)

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&C – Set DCD signal

This commands controls the Data Carrier Detect (DCD) signal.

Application to GSM AT&C0 DCD always on

GSM to application OK Command valid

Application to GSM AT&C1 DCD matches state of the remote

modem’s data carrier

GSM to application OK Command valid

&D – Set DTR signal

This commands controls the Data Terminal Ready (DTR) signal.

Application to GSM AT&D0 the DTR signal is ignored

GSM to application OK Command valid

Application to GSM AT&D1 Modem switches from data to

command mode when DTR

switches from ON to OFF

GSM to application OK Command valid

Application to GSM AT&D2 Upon DTR switch from ON to

OFF, the call is clear down

GSM to application OK Command valid

&S – Set DSR signal

This commands controls the Data Set Ready (DSR) signal.

Application to GSM AT&S0 DSR Always on

GSM to application OK Command valid

Application to GSM AT&S1 DSR off in command mode,

DSR on in data mode

GSM to application OK Command valid

O – Back to online mode

If you have established a connection and the mobile is in online command mode, this

command allows to return to online data mode.

Application to GSM ATO

GSM to application OK Command valid

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Westermo GS-01 User Manual Page 31