Hello, I spent some time today modifying the fan control script TXFAN, and am happy to say that I've managed to get it working under app_rpt. I'm sure that there is a more elegant way to accomplish this in software, but as I mentioned before, I'm no programmer. For those that are interested, this script is used to control a cooling fan via GPIO. I am using the parallel port, but I'm sure USB GPIO would also work. No modifications to node radios is required, and because the fan is controlled via GPIO, the fan may be manually turned on or off via DTMF, macro, or script. I am currently using this script with 3 RF nodes and a single large fan. Add the following to the events stanza for any/all of your RF nodes: touch /etc/asterisk/~pttstate = s|t|RPT_TXKEYED rm -f /etc/asterisk/~pttstate = s|f|RPT_TXKEYED The script TXFAN runs in a background process, and will activate the fan after X seconds of transmitting. The fan will continue to run until X seconds after transmitting ceases. The modified TXFAN script can be found at: http://www.qsl.net/k0kn/txfan Sample GPIO control scripts are also available: http://www.qsl.net/k0kn/aux1on http://www.qsl.net/k0kn/aux1off 73, Kyle Yoksh K0KN Olathe, KS Allstar 2210-2219