I have just replaced my A.B. pic box com. interface with a uic interface and have no problems communicating with my micrologix controllers and fixed slc 500 processors which use the rs232 port, but when switching the uic interface to dh485 to talk to my slc 5/02's and switching rs linx drivers to slc 500 emulator I cannot see the processor when doing a who active. I know there is not a node address problem so I can only assume it has to do with my configuration.