Today a new smart meter is installed and unfortunately my homemade P1 cable, needed to communicate with the device does not work on this new meter. I switched from an ISKRA ME382 to an ISKRA AM550.

I already looked to see if I could get my existing cable to work, switching a resistor from 1K to 10K, and that seems to make some difference, but it’s not very stable. I’m using 115200 8N1, which should be the correct baud rate for this meter, but only gibberish is received.

This content has been previously posted by me on other platforms and adapted and backdated to fill this blog.