B&B Electronics MESR900 Series - Fiber Models - Manual - Manual (Page 80)

9. Appendices VlinxMESR9xx Modbus Gateway
Page 76 Manual Documentation Number MESR9xx-2113m
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Terminal RS-422/485 4-Wire RS-485 2-Wire
A
TDA (-) Data A (-)
B TDB (+) Data B (+)
C RDA (-) ---
D RDB (+) ---
E GND GND