PELCO connection protocol

[drmacchi]

Hi all, who does know how to connect a pelco camera PTZ to a dvr with a rj45 cable with POE option by twisted pair ?

8100-FR429.jpg (18.2 KiB) Viewed 3316 times

what i know :
2 pin contacts for rs485 PT control on the back of my dvr
8 contacts of the cable should be so used : 2 for PT control , 2 for POE and 4 for VIDEO. How is schema ?

[Digit]

Looking at the picture i would assume you need a 1:1 cable so any standard patch cable would do.
Both devices at the end of the UTP cable are the same i assume, so 1:1 should always work.
With a voltage meter you can see if it complies ("where is the power supply") with the image at the bottom of this page .
http://www.eyeonfly.nl/balun.htm

[Digit]

I found another picture for you; maybe it's useful maybe not

balun_cv027_tek.jpg (42.32 KiB) Viewed 3310 times

[drmacchi]

I Digit i already have this system with 9 SIMPLE cameras using POE, so this is a working system. the problem , now, is that i would use a PTZ cam using PELCO protocol. So i do'nt know how to connect the 2 wires (i know that are 2 from manual of DVR) after the POE dongle because i have connections for VIDEO AND POWER , how could i let 2 wires coming OUT not destroying the dongle??