I’m Trying find a serial connection out of PZEM-022. It’s a relatively cheap energy meter and being able to connect it to the outside world will be really great.
The unit utilizes a Vangotech V9811A chip (DS Here) that show having 4 UART connections as well as I2C channel on pins 57 (SDA) and 58 (SCL). I was able to solder some wires on those pins but not able to pick anything. The data sheet lists triggering some register, and guessing this needs to be in the programming of the chip, i’m trying to understand if there’s another path?
Anyone has any advise how o approach this?