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Host-Based Controller Modem Data Addendum
AT Command Set June 15, 1998
AT Command Reference (continued)
Lucent Technologies Inc. Version 1.0
14
&Dn DTR Control
This command interprets how the modem responds to the state of the DTR signal and changes to the DTR signal.
&D0: Ignore. The modem ignores the true status of DTR and treats it as always on. This should only
be
used if your computer does not provide DTR to the modem.
&D1: If the DTR signal is not detected while in on-line data mode, the modem enters command mode,
issues OK result code, and remains connected.
&D2: If the DTR signal is not detected while in on-line data mode, the modem disconnects (default).
&D3: Reset modem on the on-to-off DTR transition.
Result Codes:
OK n = 0, 1, 2, 3
ERROR Otherwise
&Fn Load Factory Settings
This command loads the configuration stored and programmed at the factory. This operation replaces all of the
command options and the S-register settings in the active configuration with factory default values.
Note: In voice mode (AT+FCLASS=8), if the AT&F command is placed on the same line as other commands, the
command line is ignored. To load factory settings in voice mode, issue AT&F by itself.
Result Codes:
OK n = 0
ERROR Otherwise
&Gn V.22bis Guard Tone Control
This command determines which guard tone, if any, to transmit while transmitting in the high band (answer
mode). This command is only used in V.22 and V.22bis mode. This option is not used in North America and is for
international use only.
&G0: Guard tone disabled (default).
&G1: Sets guard tone to 550 Hz.
&G2: Sets guard tone to 1800 Hz.
Result Codes:
OK n = 0, 1, 2
ERROR Otherwise
&Jn Auxiliary Relay option
&J0: The auxiliary relay is never closed. (Default)
&J1: NOT SUPPORTED
Result Codes:
OK n = 0
ERROR Otherwise