US Robotics COURIER HST User'smanual page 47

COURIER HST
Automatic
Retrain
PLACING CALLS
6-2
Dial (D)
Dialing
Type
(P, T)
or 1200 bps, the
MNP
link-request signals may be misinter-
preted and block a successful connection.
If
you know the
remote modem doesn't support
MNP.
we recommend setting
the Courier HST to &M0 before dialing.
An HST or V. 22his modem sends a retrain signal if it
senses that a problem in the phone line connection may be
causing data unreliability. The modems stop the transfer of
data for about a second while they resynchronize. and then
resume Data Mode operation.
Retraining only occurs during 9600 and 2400 bps communi-
cations.
>
For a description of the signaling sequence, see
Appendix E-3.
The commands discussed in this section are used in the
following operations:
Dialing D (0-9
#
* . ; ! PT W
(1.1
R). DS11
Redialing A/, A>. >
Canceling dialing <any key>
When the Dial command is issued the modem goes off
hook-the equivalent of your picking up the phone-then
enters Originate Mode and dials the number sequence that
follows. The modem also executes any other commands
or options included in the command line.
The command string may include up to 40 characters, plus
the AT prefix and Carriage Return/Enter key. The modem
doesn't count spaces. It counts punctuation characters such
as parentheses and hyphens, but ignores them.
The following command instructs the modem to stop the
display of commands (E0, turn off the local echo), to dial
(DJ using Touch-Tone dialing (T), and to turn off the
speaker (M0). The spaces shown are ignored by the modem
and are only included here for readability.
AT EO DT 1234567 MO
er
If set to X0 or XI. the modem defaults to pulse (rotary)
dialing. To have the modem use tone dialing, use the T
command, which also allows you to use the asterisk
(*
J and