Hi Bob,
We have 3 wire RTD connection. So we connect 1st terminal to AIN0 and 2nd terminal to AIN1. Normally we connect this 2nd terminal to Ground also. In this configuration, we can read proper data. Now to generate open condition, we opened RTD connection across AIN0 and AIN1. We also removed AIN1 and GND connection. In this case we read FFFE data. So today we connected GND to AIN1 and kept open between AIN0 and AIN1. So basically we simulated RTD element open condition. So in this configuration, we could read 7FFEi.e. close to full scale as expected. We did not turn on burn out current source. With burn out current source enabled, we should read 7FFF.
Same case in case of RTD short. If we just create short between AIN0 and AIN1, and do not connect AIN1 to GND, we read FFFD, but we connect AIN1 to GND, we read 0000.
Do you suspect anything wrong in this observation? Otherwise we can read correct data from all channels of both ADC.
Thank you very much for all your support. You have really helped us to resolve issues.
With regards,
Vishal