ekachaiz 0 Posted March 11, 2005 Hi guys, I'm kinda new to this forum and i guess there're quite a number of experience CCTV installers here that could give me an advice and comment on a CCTV project that i'm working on. This is kind of my very first CCTV insallation project and i have very little experience on it so any advice would be a great help to me. Currently I've installed 28 speed dome cameras in this site and everything seems to work well except that there's a problem on the controlling part. I'm able to control the movement of every cameras but not zooming on some of them. The wierd thing is that, this problem seem to occur randomly. The way I solve this problem is to power off the camera that unable to zoom and turn it back on again but after sometime the problem would come back again. Further more, this problem is not just happen on certain camera but almost everyone of them. So now and then i have to walk to the camera that has zooming problem and reset it. Does anyone here has any idea what's going on? Link for the plan draw http://uk.pg.photos.yahoo.com/ph/ekachaiz/detail?.dir=2bdc&.dnm=7fe5.jpg&.src=ph Share this post Link to post Share on other sites
VST_Man 1 Posted March 12, 2005 troubleshoot it. break it down into simpler smaller circuits and test it. ie. start with one camera and then add one at a time until it repeats that problem. it may give you more info on the problem. what type of RS422/485 is it? Are the camera's on seperate power supplies or all on one? is the voltage correct? Share this post Link to post Share on other sites
ekachaiz 0 Posted March 24, 2005 Hi, I've tried to disconnect the cable and tested camera one by one. They seem ok for a while but the same problem comes back after a few hours. (able to pan and tilt but zoom). I've read somewhere stating that there must be a termination at the end of the control line. This can be done by connecting 120ohms resistor accross +RS485 and -RS485. This is to prevent signal from bouncing back or something.. I'm not quite sure about that. Does anybody has any idea?? ? Share this post Link to post Share on other sites
Thomas 0 Posted March 24, 2005 Generally it's a Dip switch or jumper in the PTZ camera itself. Share this post Link to post Share on other sites
