Appendix B
Wiring Diagrams and Pin Out Information
B-10
Bedrock Secure OSA Remote User Manual - BRDOC020_001
10/11/18
Serial Port Wiring
The Universal Serial Communication Cable is used for serial communication
between an OSA Remote and field devices. One end of the cable has a Micro-D
connector for connecting to the OSA Remote serial port. The other end has a
9-pin female D-Sub connector (the same as can be found on a standard PC) for
connecting to serial devices. The pin out for each connector is the same. The
Micro-D connector with pin numbers is shown in Figure B-11.
Important
Note that a shielded cable tied to the OSA Remote enclosure is required to
comply with product safety certifications.
Figure B-11 Serial Cable Pin Numbering
The pin out information for each serial operating mode is shown in Table B-5.
Note that each channel is isolated and pin 5 must be connected in all modes.
Table B-5 Serial Communication Pin Out Information
Pin Number
RS-232
RS-485
RS-422 /
RS-485 Full Duplex
2
RXD
RXD+
3
TXD
DATA+
TXD+
5
GND
GND
GND
7
RTS
DATA-
TXD-
8
CTS
RXD-
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