Motorola G24 用户手册

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).

In case of local link during initial PPP retries, DTR change will be ignored.

The following table shows the &D parameters.

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

In Local link:
0,3,4 Ignores DTR changes
1,2

Stop Local link. Return G24 to command mode.

The default value is 2.