Technical information

Hardware Information
3-166 AT Commands Reference Manual January 31, 2007
&D, Circuit 108 Behavior
This command determines how the G24 responds when the DTR (Data Terminal Ready) status is
changed from ON to OFF during the online data state. The DTR is an input line that indicates that
the terminal is ready.
The DTR line must be active (low) in order for the G24 to recognize the terminal. This signal is
raised by the terminal when a process activates the serial port. If the DTR is not used by the
application, it should connect this line to ground (DTR active). The default value is active (low).
The following table shows the &D parameters.
Example
AT&D?
&D: 2
OK
AT&D1
OK
Command Type Syntax Response/Action
Set
AT&D<param> OK
Read
AT&D? &D:<param>
Test
AT&D=? &D:(list of supported <param>s)
Table 3-111: &D Parameters
<Parameter> Description
<param> The G24’s reaction when the DTR status is changed from ON to OFF.
In CSD calls:
0,4 Ignores DTR changes
1 Switches the CSD call to asynchronous command mode (the call remains
connected)
2,3 Disconnects the call and returns to the command mode
In GPRS calls:
0,4 Ignores DTR changes
1 Switches the GPRS session to asynchronous command mode (the session
remains connected)
2,3 Deactivates the GPRS and returns to command mode
In MUX and MUX_INIT state:
0-3 Ignores DTE changes
4 Drops the MUX application and returns to PRE_MUX state
The default value is 2.