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5
Connection Cables and Cable Wiring
5
In this chapter, we illustrate the possible connections and cable wiring for the CP-168U
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
DB62 Female Connector Pinouts
Port
No.
1 2 3 4 5 6 7 8 Signal
1 25 6 30 33 14 38 41 TxD
22 3 27 8 11 35 16 19 RxD
44 47 49 52 54 57 60 62 RTS
43 46 48 51 53 56 59 61 CTS
2 26 7 31 34 15 39 42 DTR
23 4 28 9 12 36 17 20 DSR
24 5 29 10 13 37 18 21 DCD
Pin
No.
32 40 45 50 55 58 GND
NOTE: The CP-168U board has 1 GND wire that is shared with 6 pins (32, 40, 45, 50, 55,
and 58), none of which is assigned to a particular port (since there are 8 ports, but only 6
GND pins). If you are building your own cable, you are free to use any of the GND pins
with any of the ports.