I have an application where I communicate to 3 drives using the built in Port using modbus. I also use a rs232 POM module to talk to a wireless radio for remote control. The Brix is the master on both ports. What I noticed is if there is a comm error to the drives it creates a time delay on the other port too. This was something I hadn't figured on. I realise there a lot of ways to solve this but was wondering why this is. Or maybe I'm overlooking something.