I’m wondering what the electrical characteristics are on the RJ12 cable connecting the shunt and display on the BMV-712. It appears to power the display, so part of it must be analog. Is the current signal digital or analog?
The data connections are digital, TTL serial data. The protocol can be found in the Victron technical documents.
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A replacement PCB for the BMV-712 shunt is <$30. At that price, I have a hard time believing that there could be a microprocessor on there doing analog to digital conversion and sending serial data out the RJ12 port. I looked through the Victron technical documents and what I found was in reference to VE.Direct, which is the port on the display, not the shunt.
IIRC (If I Recall Correctly)
Not much on the PCB, two caps and two fuses (description in the archived forum somewhere) with 6 wire for (in no particular order):
- Batt+ Power supply
- Batt+ Voltage sense
- 2nd Batt+ Voltage sense / Midpoint Voltage sense / Temp sensor (BMV specific)
- Current sensor-
- Current sensor+
- GND / Batt-
