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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Legacy KB System (APS) Data: RESL187214 V1.0, Originally authored by DaSo on 07/23/2007, Last Edited by DaSo on 07/23/2007
Related ranges: Modicon M340