US Robotics 005689-03 Manual page 43

&Dn Controls Data Terminal Ready
(DTR) operations.
&D0 DTR override
&D1 DTR toggle causes online
Command mode
&D2 Normal DTR operations
&D3 Resets on receipt of DTR
&Fn Loads a read-only (non-
programmable) factory
configuration.
&F0 Generic template
&F1 Hardware flow control
template
&F2 Software flow control
template
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&Gn Sets Guard Tone.
&G0 No guard tone, U.S. and
Canada
&G1 550 Hz guard tone, some
European countries,
requires B0 setting
&G2 1800 Hz guard tone, U.K.,
requires B0 setting
&Hn Sets Transmit Data (TD) flow
control (see also &Rn).
&H0 Flow control disabled
&H1 Hardware flow control,
Clear to Send (CTS)
&H2 Software flow control,
XON/XOFF
&H3 Hardware and software
flow control