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Quick Bench Set-Up
80-99208-1 Rev. D 2-5
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Steps
TO CONNECT THE INTERFACE CABLE TO THE MODEM
■ Connect the DB-25 modem connector on the interface
cable (Figure 2-2) to the interface port on the modem
(Figure 2-1).
Do not connect power yet.
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Steps
TO CONNECT THE INTERFACE CABLES TO YOUR PC
1. On the interface cable (Figure 2-2), connect the Data port
connector (labeled “P2-DATA PORT”) to COM 1 or
another available serial COM port on your PC.
The Data port transmits packet (PPP) or asynchronous
data. You can also use it to send AT commands to the
modem. You will see an example of how this works in
Chapter 4.
2. On the interface cable (Figure 2-2), connect the Control
port connector (labeled “P3-CONTROL”) to COM 2 or
another available serial COM port on your PC (or a
different PC, if desired).
You can use the Control port to send AT commands to the
modem, without interrupting data flow on the Data port.
You will see an example of how this works in Chapter 4.
The Control port can also receive SMS messages; for
information, see Short Messaging Service (SMS) on page
5-17.
Note
If you need to extend the interface cables to reach your PC(s), you can
use straight RS-232 9-pin serial cables (with no crossovers). For
maximum RS-232 extension cable lengths, see the TIA/EIA-232-E
specification.