Hi @mohsin160 ,
When you have the chance, could you run an online simulation from your PC, following the steps outlined in the forum post below?
How to use “Online Simulation” with a serial device
Please let us know if you encounter any error messages while running the simulation.
Additionally, could you please clarify whether you are able to read any data from the HMI? This will help us better understand the issue and determine the next steps for troubleshooting.
Thank you!