User guide

Chapter 8 – Communication Commands
Multi-Tech Systems, Inc. CDMA C1 AT Commands Reference Guide (PN S000478C) 28
Set DTR Signal &D
Description: This command controls the interpretation of the Data Terminal Ready (DTR) signal on the modem
DATA port. The factory default value is 2. The AT&F command restores the value to the factory
default.
Syntax: Command syntax: AT&D<n>
Command Possible Responses
AT&D0
Note: The DTR signal is ignored
OK
Note: Command valid
AT&D1
Note: Enter online command state following ON-to-OFF
transition of circuit 108/2
OK
Note: Command valid
AT&D2
Note: Enter command state following ON-to-OFF
transition of circuit 108/2
OK
Note: Command valid
Values: <n>
0 The DTR signal is ignored.
1 Enter online command state following ON-to-OFF transition of circuit 108/2. Data call
remains active.
2 Enter AT command state following ON-to-OFF transition of circuit 108/2. Data call is
terminated. Note: All open sockets are automatically closed prior to terminating the data
call.
Set DSR Signal &S
Description: This commands controls the Data Set Ready (DSR) signal on the modem DATA port. The default
value is 0. The AT&F command restores the value to the factory default setting.
Syntax: Command syntax: AT&S<n>
Command Possible Responses
AT&S0
Note: The DSR signal always on.
OK
Note: Command valid
AT&S1
Note: The DSR signal is always off.
OK
Note: Command valid
Values: <n>
0 The DSR signal is always on. (Default)
1 The DSR signal is always off.