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Pinouts and Cabling Diagrams 210
EIA-232 Cabling Diagrams
Modem DB25 Connector
The following diagrams show how a standard straight through cable should be configured when
connecting to a DB25 modem.
DB25 Male
2 (TxD) 2 (RxD)
3 (RxD) 3 (TxD)
4 (RTS) 4 (CTS)
5 (CTS) 5 (RTS)
6 (DSR) 6 (DSR)
7 (GND) 7 (GND)
8 (DCD) 8 (DCD)
20 (DTR) 20 (DTR)
RJ45
10-pin 8-pin
2 (DCD) 1 8 (DCD)
3 (RTS) 2 4 (CTS)
4 (DSR) 3 6 (DSR)
5 (TxD) 4 2 (RxD)
6 (RxD) 5 3 (TxD)
7 (GND) 6 7 (GND)
8 (CTS) 7 5 (RTS)
9 (DTR) 8 20 (DTR)
IOLAN DS1
DB25 (DTE)
Modem DB25
(DCE)
IOLAN RJ45
Modem DB25
(DCE)