Specifications

Chapter 4 – Serial Interface Control Commands
Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 64
Chapter 4 – Serial Interface Control
Commands
The AT Commands described in this chapter allow the external application to determine various settings related to
the Multi-Tech wireless modem’s serial interface.
4.1 ATE Enable Command Echo
Description: The ATE command determines whether or not the TA echoes characters received from TE
during command state.
Syntax: Exec Command: ATE[<value>]
Response: OK
Parameters:
<value>
0 Echo mode off.
1 Echo mode on. Default (This is a factory default value and can be restored to 1
with AT&F)
The value can be stored with AT&W.
The value can be displayed with AT&V.
Notes:
• In case of using the command without a parameter, <value> is set to 0.
• This command is not PIN protected.
• This command is supported in airplane mode.
4.2 AT&C Set Data Carrier Detect (DCD) Line Mode
Description: The AT&C command determines how the state of the DCD line (circuit 109) reflects the device's
internal activity.
Syntax: Exec Command: AT&C[<value>]
Response: OK
Parameter:
<value>
0 DCD line is always ON.
1 DCD line is ON in the presence of data carrier only. Default (This is a factory
default value and can be restored to 1 with AT&F).
2 DCD line shall be on when one or more Internet services defined on the
related serial channel are in state "Connecting" or "Up" as described below.
For details on the various service states refer to AT^SISI, parameter
<srvState> or AT^SISO, parameter <srvState>.
• SOCKET, HTTP, SMTP, POP3: DCD shall be on when
<srvState>="Connecting" or "Up"
• FTP: DCD shall be on when data channel is connected; i.e.,
<srvState>="Up"
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.