Hi, I'm not sure this is the right place to post, If needed I ask some mod to move the conversation :)
I'll get straight to it, I've finally been able to comunicate with the UPS by cutting a cable and wiring the RX and TX lines to an arduino with RS232/TTL IC to my pc. The issue is not in the type of connection rather than the spam that the UPS generates, the moment I ask to enter smart mode sending Y it starts to write NA then the line voltage like this:
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