On the about box, there is no mention of Radio Frequency, but we have the PLM.

Is it possible the ISY994I is the wrong version, we should bought ISY994IR. We are using the PLM but the About box does not show the ISY as being RF capable.

We are having communication errors at our customer site, that's why we are asking this question.

The ISY itself has nothing to do with RF. That is up to the PLM and any dual band devices and access points. If you hve the 2413 PLM then you have RF. You may need one, two or three (if a 3 phase electrical system) access points to bridge phases and extend your RF coverage. Can you describe your problem in greater detail? I'm not positive but I don't believe any of the 3 Insteon devices shown above are dual band (RF capable) devices meaning you are relying on power line communication rather than RF for these.

 

-Xathros

You should edit the screen shot and black out your IP/port number. I was able to access your ISY. Of course I don't have your password, but still, I wouldn't publicly broadcast this stuff.