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What is the pinout of the Modicon M340 Modbus port?

The pinout of the integrated Modbus port on M340 CPU's BMXP34 1000/2010/2020 is as follows:

1
RXD
2
TXD
3
RTS
4
D1
5
D0
6
CTS
7
Vcc
8
Com
9
Shield
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