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4.7.1.10
&D, Circuit 108 Behavior
This command determines how the g20 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 g20 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).
Set Command
Command
AT&D<param>
Read Command
Command
AT&D?
Test Command
Command
AT&D=?
The following table shows the &D parameters.
<Parameter>
<param>
The g20's reaction when the DTR status is changed from
ON to OFF.
In CSD calls:
0
1
2
In GPRS calls:
0
1-2
The default value is 2.
98-08901C68-O
OK
&D:<param>
&D:(list of supported <param>s)
Table 70. &D Parameters
Description
Ignores DTR changes.
Switches the CSD call to asynchronous command
mode (the call remains connected).
Disconnects the call and returns to the command
mode.
Ignores DTR changes.
Deactivates the GPRS and returns to command
mode.
Response/Action
Response/Action
Response/Action
AT Commands Reference
155
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