My brookhouse mux has broken down and it can’t be repaired anymore so I brought a QK-A031 from a local marine shop. However, it doesn’t work well so far.
The problem is after connecting MLR FX312 to input1, the blue LED doesn’t flashing. I have already set up the baud rate as 4800bps as manual suggested. How to proceed now? It worked with brookhouse mux before.