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Integrator’s Reference Manual
4-4 80-99208-1 Rev. D
Tip
For complete details about making calls and understanding modem port
arbitration issues, see Developing Modem Applications on page 5-1.
Making a Call from the Data Port
You can make a data call by entering AT commands in
HyperTerminal connected to the modem’s Data port. You will
be able to see the packets streaming, just as a demonstration
that the modem can make a packet data call.
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Steps
TO MAKE A PACKET DATA CALL USING AT COMMANDS ON THE
DATA PORT
1. Make sure HyperTerminal is set up on the PC connected
to the modem’s Data port, as described in Setting Up
HyperTerminal to Talk to the Modem on page 2-15.
2. If HyperTerminal is connected to the modem on its
Control Port, you must disconnect it before you can type
AT commands on the Data port. You can leave the cable
plugged into the Control port, but disconnect from the
Control port using HyperTerminal (click the Phone icon).
3. In HyperTerminal, initiate the call on the Data port by
typing
ATD#777.
#777 is a special number that tells the modem to establish
a packet data call. HyperTerminal responds with
CONNECT. You will see random characters streaming on
the screen, with an initial tilde “~” character to indicate
that this is packet data.