Data Terminal Ready (&On) - US Robotics COURIER User Manual

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COURIER HIGH SPEED MODEMS
DATA TERMINAL READY (&On)
This command, like DIP switch 1, controls Data Terminal Ready
(DTR) signaling from the DTE to the modem. The modem is
factory set with DIP switch 1 OFF, for normal operations and the
override disabled.
If you want to change the modem's DTR operations during a
session, you can either change the DIP switch position or use the
&D command. Whichever method you choose, check either the
quick-configuration guide that came with the modem or your
communications software manual to see which setting is
required.
NOTE: At power-on and reset, the modem operates according
to the DIP switch setting. This command is not stored in non-
volatile memory as a power-on/reset default.
&DO DTR override. The modem operates as though DTR is
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
H command.
&D2 Normal DTR operations. The terminal or computer must
send a DTR signal for the modem to accept commands.
Dropping DTR terminates a call.
Interface Controls 4-17