Solution:

What exactly should be the syntax for GetDIO and SetDO functions on the ADAM-4502? This is the code in its attached example-EX2.c and it didn’t work as expected: GetDIO(EB50_ID, AllChannels, 0, &div); if(div==0) SetDO(EB50_ID,AllChannels,0,0); else SetDO(EB50_ID,AllChannels,0,1); First of all, they had to change EB50 to EB11 because EB50 only work on ADAM-4501 and EB11 is the correct for ADAM-4502. Second, GetDIO always returns 0 which must mean that it can read successfully. However, div is always 0x00 even when DI is set to high. Finally, when trying SetDO(EB11_ID,AllChannels,0,1); it doesn’t change the value of the DO.