US Robotics COURIER User Manual page 140

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COURIER HIGH SPEED MODEMS
&Bn Data Rate, terminal-to-modem (DTE/DCE).
&Cn
&BO DTE/DCE rate switches to follow connection rate
(Default).
&Bl DTE/DCE rate remains fixed at the DTE setting.
Allowable rates are 38.4K, 19.2K, 9600, 4800, 2400, 1200,
300 bps.
&B2 Shift to the user-defined fixed, higher DTE rate for ARQ
calls, follow the connection rate for non-ARQ calls.
Answer mode only.
Carrier Detect (CD) signal, modem-to-DTE. DIP switch 6 is
factory set so that the modem controls CD and the override is
disabled.
&CO CD override (CD always ON).
&Cl Modem sends CD signal when it connects with another
modem, drops CD on disconnect.
&Dn
Data Terminal Ready (DTR) signal, DTE-to-modem. DIP switch
1 is factory set OFF for normal DTR operations and the override
is disabled.
&DO DTR override (DTR always ON).
&Dl If you issue this command before connecting with another
modem, you can enter online command mode during a
call by toggling DTR. (Most communications software
packages have a method for toggling DTR.) &Dl
functions similarly to the escape code(+++), except that
&Dl will always maintain the connection and put the
modem in online command mode, regardless of the
setting of DIP switch 9.
If DIP Switch 1 is ON (DTR override) when you issue the
&Dl command, DTR override is automatically turned off.
However, if you change the setting of DIP switch 1
after
issuing &Dl, the DIP switch setting takes precedence.
Return online with the 0 command, or hang up with the
Hcommand.
&02 Terminal must send DTR for modem to accept
commands. Dropping DTR terminates a call.
Command Summary C-7