Notes

100A shunt with power meter
Modbus communication, isolated from supply.

Connect:
ezeio D0 -> 485B (pin 2)
ezeio D1 -> 485A (pin 1)
ezeio 0V -> GND (pin 3)
ezeio +V -> +VDC (pin 4)

Default settings is 19200bps, address 1
Write to holding register 1 to set new address
Write to holding register 4 to set speed
0 = 9600, 2=19200, 4=57600

NOTE: must write value 15 (0x0F) to register 0 to save/apply changes

Model ending with -R is RS485. -C is CAN (not compatible).
Need cables Digikey WM25349-ND and WM16367-ND