Hello Comunity. I just installed my new USB Relay onto my XP machine. Trying with hyperterm was a real success. But trying the sample USB Relay.ahk was not. I can see two different behavior, depending on sending on/off or read. While sending either a on or a off command, the script ends immideately wthout any errormessage, but without reaction of the relayboard. If i send a read command, the script hangs somewhere inside the "Read from RS232 Port" For me, it looks like the commands are sent correctly to the board, but the board can not read or not understand them. Did somebody see this and can help me? Kindest regards, Paul I just tried to monitor the RS232. Strange..... The command "relay on 0" is transmitted as "r.e.l.a.y. " where every dot means a 00 wile transmitted. Any ideas?