Digital IO

I mean, there would be some hardware limitations to access I2C port from MOD via CC port?

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That’s what your Arduino should take care of. For MOD the messages over CC have nothing to do with the peripherals that are attached to the CC client.

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Is CC similar to RS232? RS422? RS485? I²C?
Where can I read the spec?

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I assume you’ve read this wiki page and linked arduino code already? → Control Chain - MOD Wiki

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No, I had not yet read that page. Thank you.

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I don’t see anything there about electrical and mechanical specifications. Where is that information?

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I found it.
https://wiki.moddevices.com/wiki/Control_Chain_Protocol

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