User`s manual

31
Chapter 5 Connection Cable and Cable Wiring
In serial data communications, the term DTE is for Data Terminal Equipment, like PC
COM1/2, serial printers and terminals. The term DCE is for Data Communication
Equipment, like modems.
5.1 RS-232 Cable Wiring
The followings are pin assignments for the DB25 RS-232 connector.
DTE, DB25 Male
2 TxD
3 RxD
4 RTS
5 CTS
6 DSR
7 GND
8 DCD
20 DTR
Type 1: To connect the Smartio C104 PCI Series to a DTE device.
PC COM2 port, serial printer,
terminal, or any DTE device
C104 PCI
C104 PCI DTE Device
DB25 Male DB25 Male
TxD 2 2 TxD
RxD 3 3 RxD
RTS 4 4 RTS
CTS 5 5 CTS
DSR 6 6 DSR
DTR 20 20 DTR
GND 7 7 GND
DCD 8 8 DCD
DTR 20
2 TxD
3 RxD
4 RTS
5 CTS
6 DSR
7 GND
8 DCD