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I now have a modbus master. This made things much easier. I think I got the twist on the 3F BF commands. |
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Guess what arrived yesterday :)
There is no dedicated M-Bus chip on this PCB, they solved with a couple of standard components. It's connected to the µC (Renesas UPD78F0455) via Pins 62 (TxD0) and 63 (RxD0).
The circuit doesn't block TX being received by its own RX, so keep that in mind when looking at the RX records, those are foreign and own data.
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