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Connection Cables and Cable Wiring
In this chapter, we illustrate the possible connections and cable wiring for the CP-104UL
boards.
In serial data communications, DTE stands for Data Terminal Equipment, such as a PC’s
COM1/2, serial printers, and terminals, and DCE stands for Data Communication
Equipment, such as modems.
RS-232 Cable Wiring
Board Pinouts—DB44 Female
RS-232
Port 1 Port 2 Port 3 Port 4
13 TxD 9 TxD 5 TxD
1
TxD
14 RxD 10 RxD 6 RxD
2
RxD
15 RTS 11 RTS 7 RTS 3 RTS
28 CTS 24 CTS 20 CTS 16 CTS
29 DTR 25 DTR 21 DTR 17 DTR
30 DSR 26 DSR 22 DSR 18 DSR
42 DCD 39 DCD 35 DCD 31 DCD
44 GND 41 GND 37 GND 33 GND