Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 154)

Serial Port Commands
Set DTR Signal &D
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WM_DEV_OAT_UGD_049 - 001 VOLUME 1 August 23, 2007
8.8 Set DTR Signal &D
8.8.1 Description
This command controls the Data Terminal Ready (DTR) signal.
8.8.2 Syntax
Action command
AT & D[<n>]
OK
Read command
None
Test command
None
8.8.3 Parameters and Defined Values
<n>: DTR signal control parameter
0 DTR signal is ignored.
1 Wireless CPU ® 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 (default
value).
8.8.4 Parameter Storage
The <n> parameter is stored in EEPROM using AT&W command. The default value
can be restored using AT&F.