Sometimes, when you run the Moxa PRP Setting tool, you might see the following error message because of which the expansion module card cannot be used.
This issue occurs because Windows OS does not have the registry entry ModelName for DA-820C resulting in the computer not being able to detect the PRP/HSR expansion card.
To solve this issue, add a registry entry in Windows as described below:
1. Open the Windows registry and go to the path: Computer\HKEY_LOCAL_MACHINE\SOFTWARE\MOXA
2. Create a new registry entry ModelName with the value DA-820C
3. Restart the computer.
The PRP utility will now be able to detect the PRP/HSR card.