Data Carrier Detect (Dcd) Control; Data Terminal Ready (Dtr) Control; Xon/Xoff Pacing Control; Restore Factory Default Configuration - Multitech MultiModem SocketModem MT9234 Series At Commands Reference Manual

&C
Description:
Syntax:
Values:
Default:
Result Codes:
&D
Description:
Syntax:
Values:
Default:
Result Codes:
&E
Description:
Syntax:
Values:
Default:
Result Codes:
&F
Description:
Syntax:
Values:
Default:
Result Codes:
Note:
Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H)
Downloaded from Elcodis.com electronic components distributor
Chapter 1 – AT Commands, S-Registers, and Result Codes

Data Carrier Detect (DCD) Control

Use this command to control the modem's response to receiving a remote modem's
carrier signal. Data carrier detect (DCD) is a signal from the modem to the computer
indicating that the carrier signal is being received from a remote modem. The modem
typically turns off DCD when it no longer detects the remote modem's carrier signal.
AT&C<value>
0 DCD remains ON at all times.
1 DCD turns ON when the remote modem's carrier signal is detected, and
turns OFF when the carrier signal is not detected.
1
OK if <value> = 0 to 1.
ERROR if <value> ≠ 0 to 1.

Data Terminal Ready (DTR) Control

Use this command to select the modem's response to the data terminal ready (DTR)
signal. The host system generates the DTR signal and supplies it to the modem.
AT&D<value>
0 Modem ignores true status of DTR signal and treats it as always on. Use this
command if the computer does not provide DTR to the modem.
1 If DTR is not detected while in online data mode, the modem enters
command mode, issues an OK, and remains connected.
2 If DTR signal is not detected while in online data mode, the modem
disconnects.
3 Resets the modem on the on-to-off DTR transition.
2
OK if <value> = 0 to 3.
ERROR if <value> ≠ 0 to 3.

XON/XOFF Pacing Control

Enables or disables XON/XOFF pacing.
AT&E<value>
12 Disables XON/XOFF pacing.
13 Enables XON/XOFF pacing.
12
OK if <value> = 12 to 13.
ERROR if <value> ≠ 12 to 13.

Restore Factory Default Configuration

Use this command to reset the modem to the configuration programmed at the
factory. This operation replaces all of the command options* and S-register settings
in the active configuration with factory default values.
Note: In voice mode, the command line is ignored if the AT&F command is placed on
the same line as the other commands. To load factory settings in voice mode, issue
the &F<value> command by itself.
AT&F<value>
0 Loads factory settings as active configuration.
None
OK if <value> = 0.
ERROR if <value> ≠ 0.
There are several noted exceptions to this command and caution should be used
when determining the state of the command options once this command has been
executed.
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