The converter looks like a serial port (
Just a cable A-A, B-B, both converter and meter just have two pins.
I have set the right speed, 2400 baud as the meter shows on the display, but I just get time out, either on Raspberry Pi or on two different USB scanners.
Am I missing something?
I finally got it working.
playingdeveloping with a 3-phase meter, but on my workbench I only have one phase, so I connected it to phase L1, and the display went on nicely. However, the modbus only works if the meter have power on L2, not L1 or L3.
Also, the only register is the accumulated power, which is hidden at 0x011e, which my scanner were not testing; I/it presumed the registers were starting at 0 or 1.
I also added a 150Ω resistor at each end, if it didn't help for the signals, at least it helped getting the flimsy wires of my phone cable into the connectors; I soldered the wires onto the resistor ;-)