B&B Electronics MESR900 Series - Fiber Models - Manual - Manual (Page 79)

9. Appendices VlinxMESR9xx Modbus Gateway
Page 75 Manual Documentation Number MESR9xx-2113m
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Appendix D: Connector Pinouts
MESR901-x Serial Port Pinouts
DB9 M Pin Direction RS-232
1 Input DCD
2 Input RXD
3 Output TXD
4 Output DTR
5 --- GND
6 Input DSR
7 Output RTS
8 Input CTS
9 Input RI