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So both cards are ignoring the address jumpers. Setting the base address of one board to 2 via the Pi worked.

So with a single board attached it only communicates with address 1 no matter which jumpers are added. I always change the jumpers with the power off.

Set up is two four relay / 4 input V4.0 boards with no jumpers on the first board and the second board has the RS485 terminator and ID0 jumpers fitted. I am using Qmodmaster to control the boards. I am able to turn on and read the coil status from a single board, but when I attached the second...