Connection between display and power bar board lost

[Rob F]

Hi Matt, that's surprising, I had your kit running for a day with no issues. Those voltages over 5v are the input pins. The outputs are all reading 5v which means the IC is doing its thing but the voltages coming in probably isn't a signal. The problem is from the display to the power bar. I think its impossible for the display to send over 5v through the patch cable unless it was shorted out or plugged in the dosing pump port. I say that because these voltages come from the same IC on the display board which has 5v going into it so its not possible for it to put out over 5v. Here's some things to try.

Disconnect everything and test the voltages on the RJ45 jack on the display board, leave the arduino on the board with the proper sketch running, you should have 12v on pin 8, and 5v on pin 3 and 5. If you do then plug in your patch cable and test the voltages at the end of the cable. If you don't have the proper voltages check the voltage on the Tx1 and Tx2 pin on the arduino. They should put out 3.3v.