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6-3
The Internal Modem
Command Function/Options
&D
n Data Terminal Ready (DTR) Control.
&D0 Modem ignores true status of DTR signal and responds
as if it is always on.
&D1 If DTR drops while in online data mode, the modem
enters command mode, issues an OK, and
remains connected.
* &D2 If DTR drops while in online data mode, the modem
hangs up. If the signal is not present, the modem will
not answer or dial.
&D3 If DTR drops, the modem hangs up and resets as if an
ATZ command had been issued.
E
n Set Modem Command Mode Echo.
E0 Disable echoing of command mode characters.
* E1 Enable echoing of command mode characters.
&W
n Store Current Modem Configuration.
&W0 Stores current modem settings in non-volatile memory
and causes them to be loaded instead of the factory
defaults at power-on or when the ATZ command
is invoked.
* &W1 Clears user default settings from non-volatile memory
and causes the factory defaults to be loaded at power-on
or following the ATZ command.
+++AT In-band Escape Sequence. Puts the modem in command mode
(and optionally issues a command) while remaining online. Type
+++AT and up to six optional command characters; then press
[Enter]. Used mostly to issue the hangup command:
+++ATT<CR>.
&Q
n Asynchronous Communications Mode.
&Q0 Asynchronous with data buffering. Same as /N0.
* &Q5 Error control with data buffering. Same as /N3.
&Q6 Asynchronous with data buffering. Same as /N0.
&Q8 MNP error control mode. If MNP error control is not
established, the modem falls back according to the
setting in Register S36.
&Q9 V.42 or MNP error control mode. If neither error
control method is established, the modem falls back
according to the setting in Register S36.