terminating rs 485??

[catfish80 0]

hello everyone, and sorry for this stupid question. I did a search on the forum and came up empty handed but i am putting in my second ptz and intend to put more in down the road as money becomes available. I am having no luck with my second ptz tho, when i hook it up, i have full control of it but lose control of my original, i have assigned them the appropiate address that syncs up with the identical address on my dvr so i dont think that is the problem. After reading about this, i think i need to terminate the long run, buuuutttttt, i dont know how. Please be kind as I am new here and will hopefully be able to provide advice to other "newbies" down the road as I gain knowledge. Any diagrams, picture, etc... would be greatly appreciated. Thank in advance

[catfish80 0]

after more research, i am using the star wiring pattern, i will in the future add more ptz's with a possibly longer run. There are no dip switches to terminate like i have read elsewhere, so if i terminate now, which i still do not know how, will i be able to reverse that once a longer run goes up. the ptz i need to terminate is a qsee qd6531z, once again i apologize if this is repetive information you folks provide.

[hardwired 0]

Each camera needs a unique channel address (usually is set to match the camera number input on the DVR), only the baud rate and protocol should match the DVR settings.

 

See page 4 of the manual here, http://qsee.custhelp.com/ci/fattach/get/97735/1353530960/redirect/1/session/L2F2LzEvdGltZS8xMzU1MTkwNTkyL3NpZC9nUjFoaXJkbA==/filename/QD6513Z%20QD6505P%20Camera%20Manual_web.pdf

[catfish80 0]

Yes, I have the addresses correct, just need to know the proper way to terminate the rs 485

[justincameras 0]

Some DVR's terminate the RS485 with a programmed switch, Some cameras have an EOL End of line dip switch. If either of these are not avaiable, try a 120 Ohm resistor across the last camera's 485 wires in parralel.

 

http://www.rs485.com/rs485spec.html