Conectors pinout on Reach M+

Can anyone help me about Reach M+ pinout?

image

On S1 port, what is CTS and RTS?

It is serial port jargon:

CTS = clear to send
RTS = ready to send

Used for flow control. Not is common usage anymore, but it can be useful for some installations.

https://en.m.wikipedia.org/wiki/RTS/CTS for more

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