First time playing with AO820 and I came ot result. In Hw structure I use Integer for output value. I like to use complete rand +/- 20mA. When integer is 0 I get 4mA on output. When integer is -7210 then surrent is 0mA. Any idea about his behaviour.
Second problem is with AI820 it is on TU810 and always gets red light on - what can be problem.
Make sure the module is properly inserted in the base and its is locked by locking mechanism. Are you measuring from correct terminal points? For AO820/TU810, Its between C1 & B1 for channel 1. C3 & B3 for channel 2.
In AI820 for Channel 1, a 4 wire transmitter shall be connected to C2, B2 and C1,B1 has to be looped. for Channel 2 four wire transmitter shall be connected to C4, B4 and C3,B3 has to be looped.