Hi @ all, I want to use one of my URIx interface with RMSexpress under Windows 7 Professional 64 Bit. The sound in both directions is working fine but I wasn't able to figure out how I can configure RMSexpress to activate the PTT line, I can configure a com port where RTS or DTR can be used as the PTT line. I wonder if there is an additional driver or another trick to get access to the PTT line. Thank you very much for your help in advance. -- 73 & 55 de Stephan, DG1BGS