US Robotics COURIER - Escape Code Operations (+++)

COURIER HIGH SPEED MODEMS
• Wait one second after sending the last item of data
• Type:+++
• Wait one second before typing any data
Do not type the AT prefix or a Carriage Return. The guard time
of one second before and after the code prevents the modem
from misinterpreting the occurrence of +++ in the transmitted
data stream.
NOTE: If you've previously issued the &Dl command, the
modem will also recognize a software DIR toggle. &Dl is
described in Chapter 4 and Appendix C.
If necessary, the character used in the escape code or the dura-
tion of the guard time can be changed by resetting Register S2 or
S12. See the S-Register Summary in Appendix B.
Modem Response to +++
The modem returns to Command mode when it detects the
escape code. However, it keeps the line open or hangs up,
depending on the setting of DIP switch 9:
DIP Switch 9 Response to +++
OFF
ON
Modem goes on hook (hangs up), sends NO
CARRIER result code (factory setting)
Modem maintains connection (Online-Command
mode), sends OK result code
The factory setting (OFF) forces an automatic disconnect when
you issue+++. An advantage of this is that you are not likely to
inadvertently run up an all-night phone bill.
Set DIP switch 9 ON if you want the modem to respond to +++
by entering Online-Command mode, enabling it to execute
commands and return online. (See the 0 command, below.)
WARNING: For unattended modem operations: in rare instances,
the modem may fail to recognize the+++ escape code sequence.
If you are running the modem under software control for unat-
tended operations, we suggest you use the surefire method of
dropping the DIR signal from the DTE for at least 50 millisec-
onds, to ensure against costly phone charges. Methods of turn-
ing the DIR signal off-for example, closing the communica-
tions port-differ from one computer to another.
6-1 O Asynchronous Operations
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