LTE Module Series
EC25&EC21 AT Commands Manual
EC25&EC21_AT_Commands_Manual 31 / 231
3
Serial Interface Control Commands
3.1. AT&C Set DCD Function Mode
The command
controls the behavior of the UE‟s DCD (data carrier detection) line.
Parameter
3.2. AT&D Set DTR Function Mode
The command determines how the UE responds if DTR line is changed from low to high level during data
mode.
AT&C Set DCD Function Mode
Execution Command
AT&C[<value>]
Response
This parameter determines how the state of circuit 109(DCD)
relates to the detection of received line signal from the distant
end.
OK
Maximum Response Time
300ms
Reference
V.25ter
<value>
0
DCD line is always ON
1
DCD line is ON only in the presence of data carrier
AT&D Set DTR Function Mode
Execution Command
AT&D[<value>]
Response
This parameter determines how the TA responds when circuit
108/2 (DTR) is changed from low to high level during data
mode.
OK
Maximum Response Time
300ms