Serial Ports and Cables
GFK-0356Q Appendix A Serial Ports and Cables A-3
A
Series 90 PLC Serial Port
The Series 90 PLC serial port is compatible with RS-422. An RS-232 to RS-422 converter is
required to interface to systems that provide RS-232 compatible interfaces. The Series 90 PLC
RS-422 serial port provides the physical connection for SNP communication. This port is a 15-pin
D-type female connector located as follows:
■ Series 90-70 PLC and Series 90-20 - CPU Module
■ Series 90-30 PLC - Power Supply
Figure A-1 shows the serial port orientation and connector layout for the Series 90 PLC types.
(The orientation of the connector on the Series 90-20 CPU is rotated 90 degrees from the Series
90-30 connector with pin 1 to the upper right.) Table A-2 shows the pin numbering and signal
assignment applicable to both PLCs.
SERIES 90-70 PLC
15
8
9
8
15
SERIES 90-30 PLC
PIN
1
9
PIN
1
SERIES 90 PLC CONNECTORS
USE METRIC HARDWARE.
(SEE CONNECTOR SPECIFICATIONS)
NOTE
Figure A-1. Series 90 PLC, RS-422 Serial Port Connector Configuration
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