Legal Removal Request

Post: I've an ADC Differential Pi which was working just fine, then quit... timing out on read_voltage. The RPI also has an ADC Pi which works as expected, so I know the IC2 stuff is good. I've swapped the IC2 addresses, stil no ADC Differential Pi readings. I bought another ADC Differential Pi, assembled it, and am getting the same results. My input is microvolts (from a current shunt). At this point I've disconnected any input, looking to see if that will eliminate the timeout. Same result. I'm coding in Python and created a simple standalone program that solely imports the ADCDiff lib, sets the IC2 address, and does a read_voltage. Same result... just wanted to rule out something in other code being in the way. I've ordered 3 more ADC Differential Pi units, figuring this must be a hardware failure. That said, is there a means to ping the unit and get a reply that confirms it's alive? Thanks! Chuck