I received my new 4-channel board today and have been able to interface with the MCP3428 via my Particle Electron. So far as I can tell, everything is functional between the MCP3428 and the Electron. I have the board powered by an external battery running at 12v.
In order to test my new board, I got my4-20 pressure transducer out and put it on channel 1. When I try to read any of the channels, I keep getting lower numbers than I should for a sensor being connected (112 at 16-bit and 7 at 12-bit). In fact… the numbers don’t change at all when the sensor is connected or not.
I got out my voltmeter and there is no voltage on the screw down terminals for the sensor wires. Is something wrong with the board or am I missing something about how the 4-20ma is supposed to work?