Hello Andreas, I have something very similar for my TXFAN script. Any time the node radio is transmitting, the event happens. In my case, I touch a file on the ramdisk during transmit but it would be easy to instead turn on the GPIO. Does your system use a repeater controller? In other words, does local audio cause app_rpt to transmit? In my repeater, I have a controller that handles local audio and therefore app_rpt does not know when local users are keying. If you want to see my TXFAN script, it has examples for the Event Management Subsystem in the comments at the top: http://www.qsl.net/k0kn/txfan 73 and GL, Kyle K0KN --- Original Message --- Hi Gang, I am using an allstar link repeater tied together with a second rpeater system nearby. I need a possibility to switch an uri gpio i/o pin to high always a station connects from outside (via internet) and i talking. if talking stops (no speech from outside via internet) the i/o ping must go low, if talking starts agein the i/o pin has to go high. No action on this pin (always low) if no one is connected from outside (there are then onky local users of the repeater). I hope somebody can help jhow to do this woth the event management subsystem. Thanks a lot Andreas, DL5MGD, Node 295656