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COM Port-to-Modem Cable
3166-A2-GB20-20
Use a serial crossover cable when connecting the COM port to a modem or other
external device. Figure D-8 shows the pin assignments from the COM port to the
external device.
COM Port
Non-Keyed
8-Position
Modular Plug
No
Tx Clock
1
Connection
Rx Data
2
Signal Ground
3
Tx Data
4
DTR
5
CD
6
RTS
7
No
Rx Clock
8
Connection
Figure D-8. Com Port-to-Modem Cable
March 1999
Modem
DB25 Plug
2
Tx Data
7
Signal Ground
3
Rx Data
6
DSR
4
RTS
20
DTR
5
CTS
97-15669
Pin Assignments
D-11
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