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APPENDIX D: SERIAL CONNECTOR PINOUTS
TERMINAL BLOCK PINOUTS
Terminal
A
B
C
D
E
In RS-422 mode, TX lines are outputs and RX lines are inputs. Connect the Modbus Gateway TXB(+) line to the
RXB(+) line of the Modbus network; and the Modbus Gateway TXA(-) to the RXA(-) of the Modbus network.
Ground is signal ground and provides a common mode reference for the RS-422 Receiver and Transmitters.
Modbus Gateway – BB-MESP211T
RS-232
Direction
(RS-232)
RTS
Output
TD
Output
CTS
Input
RD
Input
GND
****
58
RS-422
RS-485
TDA (-)
Data A (-)
TDB (+)
Data B (+)
RDA (-)
---
RDB (+)
---
GND
GND
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