The documentation in the downloads section does not provide information about all the labeled I/O located on the device. Specifically the difference between AI and AIS as well as AO and AOV. Is there more up to date documentation available? Or could you provide us with these specs?
On a side note, we recieved 2 M503s. On each, RO2.2 and 2.3 are labeled twice, should they actually be 2.4 and 2.5 instead?