Hi Martin,
As I mentioned earlier I am using CommMG.au3 V2.90 to communicate with RFXtrx for controlling light switches. This works fine, but occasionally I get the error: Access denied getting ipcount. This error is given in a pop-up window with title: Autoit3 and an OK button. At this point program execution is interrupted. This message occurs at the use of: _CommReadByte(0). Is it possible not to give this error in a pop up window, but in the @ERROR status? In that case I can catch the error and restart the connection with RFXtrx.