Multitech MT9234ZBAUSBCDC Guía de usuario descargar pdf (Pagina 14)

Chapter 1 – AT Commands, S-Registers, and Result Codes

Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H) 14

&C Data Carrier Detect (DCD) Control

Description: 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.

Syntax: AT&C<value>

Values: 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.

Default: 1

Result Codes: OK if <value> = 0 to 1.

ERROR if <value> ≠ 0 to 1.

&D Data Terminal Ready (DTR) Control

Description: 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.

Syntax: AT&D<value>

Values: 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.

Default: 2

Result Codes: OK if <value> = 0 to 3.

ERROR if <value> ≠ 0 to 3.

&E XON/XOFF Pacing Control

Description: Enables or disables XON/XOFF pacing.

Syntax: AT&E<value>

Values: 12 Disables XON/XOFF pacing.

13 Enables XON/XOFF pacing.

Default: 12

Result Codes: OK if <value> = 12 to 13.

ERROR if <value> ≠ 12 to 13.

&F Restore Factory Default Configuration

Description: 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.

Syntax: AT&F<value>

Values: 0 Loads factory settings as active configuration.

Default: None

Result Codes: OK if <value> = 0.

ERROR if <value> ≠ 0.

Note: 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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