SNAP PAC R1 with AIMA - 8


my application is R1 serial communication with radio modem and AIMA-8 in slot-0 in SNAP-PAC RCK-4.

By giving Analog input to CH0 in 4ma and observing in opto pac control program AI_0 showing 4ma but after connection RS 232(Tx,Rx,Gnd) in R1 then in control program AI_0 value is varying from 3.96ma to 11.5ma.

kindly suggest

Please measure the power supply voltage using a good quality meter.
You can read more about power supplies here;

We have a one minute showing how here;