Synchronous Mode (&Ml); Dialing Out - US Robotics COURIER User Manual

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COURIER HIGH SPEED MODEMS
data flowing in both directions. We do not recommend
this setting for HST modems.
Synchronous Mode (&Mt)
The modem must be set to &Ml for synchronous operation. The
modem remains in asynchronous command mode until it makes
a synchronous connection with a remote modem. Upon
connection, the Courier enters synchronous mode and sends
synchronous timing signals to your DTE. Note that the Courier
does not respond to commands until it returns to asynchronous
Command mode.
DIALING OUT
The modem's stored command feature (&ZC=s) allows you to
configure the modem for a synchronous connection and to dial
out to the Host computer by just pressing the voice/ data switch.
Below are our recommended procedures.
1. If your communications software isn't running, load the
program and put the computer in Terminal mode, as
described in Chapter 2. Terminal mode allows you to send
AT commands directly to the modem.
2. Store a command string (&ZC=s) that configures the modem
according to the guidelines in the previous section, Setting
the Modem, and the Host computer's requirements. In
addition, include the &Ml command, to have the modem
enter synchronous mode, followed by the appropriate Dial
string. The following is an example:
AT &ZC
=
&F &X1 &M1 DT5551234 <Enter>
In the example, &F restores the modem's factory defaults,
while &Xl, which specifies the computer as the synchronous
timing source, is the only non-default setting used besides
synchronous mode (&Ml). Any non-default settings should
follow the &F command. The Dial command should be the
last entry before the Carriage Return.
3. Set the voice/ data switch to Option 9, so that the modem
executes the stored command string when you press the
switch. Type the following:
ATS32
=
9 <Enter>
Synchronous Operations 7-5