E. Connectors, Cables, and Pin Assignments
9700-A2-GB20-20 December 2002 E-11
Configuring an External Modem
Procedure
To configure an external modem:
1. Disconnect the asynchronous terminal from the standard cable.
2. Reconnect the crossover cable to the external modem. See
DB25-to-DB25
Crossover Cable
on page E-12 or
DB9-to-DB25 Crossover Cable
on
page E-13 for a drawing of the cable.
3. Enable auto-answer on your modem, and configure it to use the following
LSD, DSR, CTS, RTS, and DTR control leads.
See the table below for AT D0 command strings. Use the following command
string:
AT &C0 &D2 &S0 &R1 \D0 S0=1
Enter AT Command . . . To configure the modem to . . .
&C0 Force LSD on
&D2 Drop the connection when the unit drops DTR
&S0 Force DSR on
&R1 Ignore RTS
\D0 Force CTS on
S0=1 Automatically answer incoming calls
