US Robotics 56K Series Manual page 75

&Dn Controls Data Terminal
Ready (DTR)
operations
&D0 DTR override
&D1 DTR toggle causes
online Command mode
&D2 Normal DTR operations
&Fn Loads a read-only
(non-programmable)
factory configuration
&F0 Generic template;
no flow control
&F1 Hardware flow control
template
&F2 Software flow control
template
&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
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