Specifications

Chapter 4 – Serial Interface Control Commands
Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 65
4.3 AT&D Set Data Terminal Ready (DTR) Line Mode
Description: AT&D determines how the ME responds if the DTR line is changed from ON to OFF during data
mode.
Syntax: Exec Command: AT&D[<value>]
Response: OK
Parameter:
<value>
0 ME ignores status of DTR. This is the default value if the parameter is omitted.
1 ON->OFF on DTR: Change to command mode while retaining the connected
call.
2 ON->OFF on DTR: Disconnect data call, change to command mode. During
state DTR = OFF auto-answer is disabled. Default (This is the factory default
value; it can be restored to 2 with AT&F).
The value can be stored with AT&W.
The value can be displayed with AT&V.
Notes:
• This command is not PIN protected.
• This command is supported in airplane mode.
4.4 AT&S Set Data Set Ready (DSR) Line Mode
Description: AT&S determines how the ME sets the DSR line depending on its communication state.
Syntax: Exec Command: AT&S<value>
Response: OK
Parameter:
[<value>]
0 DSR line is always ON. Default (This value is the default value if the parameter
is omitted. It is also the factory default value and can be restored to 0 with
AT&F)
1 ME in command mode: DSR is OFF.
ME in data mode: DSR is ON.
The value can be stored with AT&W.
The value can be displayed with AT&V.
Notes:
• This command is not PIN protected.
• This command is supported in airplane mode.