Appendices
Vlinx MESP211 Modbus Gateway
67
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MESP211 TERMINAL BLOCK PINOUTS
Terminal
RS-232 Direction
(RS-232)
RS-422
RS-485
A
RTS
Output
TDA (-)
Data A
(-)
B
TD
Output
TDB (+)
Data B
(+)
C
CTS
Input
RDA (-)
---
D
RD
Input
RDB (+)
---
E
GND
****
GND
GND
In the 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.
