Hello @wzp, we don't have such thing, but you can find STEP models or CAD drawings for our products in the download section: https://kb.unipi.technology/en:files:products:00-start
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the relays are connected via I2C expander MCP23008. You can communicate directly with the chip by using e.g. this tutorial: https://learn.adafruit.com/using-mcp23008-mcp23017-with-circuitpython/python-circuitpython
Or, which is more preffered way, to use our API called Evok: https://github.com/UniPiTechnology/evok. With this API, you will get a uniform access to all IOs across all our products.
Can you check the statistics registers 2000+ / 2100+?
Intresting! I would partecipate as Codesys developer!