Multi-Tech Systems MMCModem GPRS (MTMMC-G) - Manual (Page 102)

Chapter 12 – V.24 and V.25 Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 102
Set DTR Signal &D
Description: This commands controls the Data Terminal Ready (DTR) signal .
Values:
0 The DTR signal is ignored
1 Modem switches from data to command mode when DTR switches from ON to OFF
2 Upon DTR switch from ON to OFF, the call is released
Syntax: Command syntax: AT&D
Command Possible responses
AT&D0
Note: The DTR signal is ignored OK
Note: Command valid
AT&D1
Note: Modem switches from data to command mode when
DTR switches from ON to OFF OK
Note: Command valid
AT&D2
Note: Upon DTR switch from ON to OFF, the call is released OK
Note: Command valid
Set DSR Signal &S
Description: This commands controls the Data Set Ready (DSR) signal.
Values:
0 DSR always on
1 DSR off in command mode. DSR on in data mode.
Syntax: Command syntax: AT&S
Command Possible responses
AT&S0
Note: DSR always on OK
Note: Command valid
AT&S1
Note: DSR off in command mode, DSR on in data mode OK
Note: Command valid
Back to Online Mode O
Description: If a connection has been established and the ME is in command mode, this command allows you to
return to online data mode.
Values: No parameters
Syntax: Command syntax: ATO
Command Possible responses
ATO
Return from offline mode to online mode OK
Result Code Suppression Q
Description: This command determines whether the mobile equipment sends result codes or not.
Values:
0 DCE transmit result codes
1 Result codes are suppressed and not transmitted
Syntax: Command syntax: ATQ
Command Possible responses
ATQ0
Note: DCE transmits result codes OK
Note: Command valid
ATQ1
Note: Result codes are suppressed and not transmitted Note: No response