XperCam

The form looks like a great way to stay up to date, I have been in the CCTV business since... The tube type camera by RCA(Burle). Happy posting! Roy

Try using an old fashion com port tester (in line with LEDs) and check if you may need a nul modem, its been a while since I install a door king system, Door king tech support was perry good last time I used them. Also make sure ALL the setting are exaclly the same on both ends (Baud rate stop biit...etc.) PS: I hate com ports on PC based systems with windows