GE 90-30 PLC Series Installation And Hardware Manual page 349

Table A-3. Workmaster RS-232 Serial Port Pins-out
Pin No.
2
3
4
5
6
7
8
9, 0
2– 9
20
2
22
23–25
For more information about the Workmaster industrial computer serial port refer to the following
manuals:
GFK-0401 Workmaster II PLC Programming Unit Guide to Operation
GEK-25373 Workmaster Programmable Control Information Center Guide to Operation
IBM-AT/XT Serial Port
The IBM-AT, IBM-XT or compatible computer's RS-232 serial port is a 9-pin D-type male
connector as shown in the figure below.
Figure A-3. IBM-AT/XT Serial Port
GFK-0356Q Appendix A Serial Ports and Cables
Workmaster II (25-pin connector)
Signal Description
NC
TD Transmit Data
RD Receive Data
RTS Request to Send
CTS Clear to Send
NC
GND Signal Ground
DCD Data Carrier Detect
NC
Tied to line 20
NC
DTR Data Terminal Ready
NC
Ring Indicate
NC
Serial Ports and Cables
Workmaster (9-pin connector)
Pin No. Signal
2 TD
3 RD
4 RTS
5 CTS
6
7 GND
8 DCD
9 DTR
NC = Not Connected
a44523
IBM-AT/XT
5
9
PIN
6
1
A
Description
NC
Transmit Data
Receive Data
Request to Send
Clear to Send
NC
Signal Ground, 0V
Data Carrier Detect
Data Terminal Ready
A-5