Bob the bridge 0 Posted August 3, 2012 Hello, I recently purchased a Swann pro-750 PTZ camera to work with my QT428 DVDR but I'm having trouble connecting the camera to the DVDR. At the back of the DVDR I have 4 (ports) right under the RS485 mark. P/Z (Y)-(Z) K/B (A)-(B) And the PTZ camera have a purple and grey cable. The PTZ controls works with the Swann infrared controller and remote, but can't seem to make it work with the QT428 DVDR. Thanks a bunch. Share this post Link to post Share on other sites