US Robotics COURIER - Returning Online ( 0); Hanging up (Hn); Automatic Answering

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COURIER HIGH SPEED MODEMS
RETURNING ONLINE (0)
If DIP switch 9 is ON (on detection of the escape code the
modem maintains the connection), you can issue commands and
then toggle the modem back online with the 0 command, as in
this example:
AT 01 0 <Enter>
There are three ways to return online.
ATOO Return online (normal). (Used in the example above.)
ATOl Return online and retrain. Use if there were errors in a
non-ARQ data transfer.
AT02 Return online, initiate a 2400 bps speed shift, and drop
down to 1200 bps. Applies only to calls at 2400 bps, and
may be used if the remote modem is a V.22 bis modem
and AT01 didn't work. Used mainly for testing purposes.
HANGING UP (Hn)
If DIP switch 9 is ON (factory setting), the escape code forces the
modem back to Command mode but leaves the line open. If you
want the modem to hang up, issue the following command once
the modem sends the OK result code.
ATH <Enter>
If DIP switch 9 is OFF, the modem automatically hangs up on
receipt of the escape code.
AUTOMATIC ANSWERING
The Courier is shipped with DIP switch 5 ON, Auto Answer
suppressed. To set the modem to automatically answer incom-
ing calls, do one of the following:
1. Before powering on your system, set DIP switch 5 OFF.
When you turn the computer on, the modem answers
incoming calls on the first ring.
2. When the modem is on, use software control. The following
command instructs the modem to answer on the first ring.
(You can substitute a higher value. See the S-Register
summary in Appendix B.)
Asynchronous Operations 6-11