Last Revised 05/09/2013
9
installation companies use a CAT5 type or similar cable to run out to the domes to carry the
data signal.
If you are considering using baluns please note - DVR’s tend to require very good video
signals to function correctly and “passive baluns” can loose some signal strength over the 50
metre mark so try to restrict the use of passive baluns to below 50 metre cable runs when
using them with DVRs. Above this distance perhaps consider an active balun. Active baluns
require power, passive baluns do not.
You can mix and match how you wire up your PTZ installation and the following general
diagram gives you a guideline about how to do it. Remember this is a GUIDE and is not an
instruction what
to fit!
Many installation companies can get the power and video signal correct, but struggle
with the control of the dome using the keypad or DVR using the RS485 data.
The key to successfully installing the data cabling to the dome is to get the basics
right. Use a quality data cable such as CAT5 (never use just a standard untwisted
cable such as alarm cable for the RS485 signal).
Also, you must follow the RS485 wiring convention; the following section explains
this.
BAL
UN
PTZ
DOME
LOCAL
PSU
240V ---
CAT 5
CAT5 Carries
Video &
Control Data
CCT CAMERA
Video
& Power
TRADITIONAL
CAMERA
JUNCTION BOXES
PSU
12V
DC
240V
AC
Free Lead Supplied
KEYPAD
DVR
CO-AX RG59
MONITOR
PTZ
DOME
RG59+2 Video & Power
CAT5 Carrying Data
C
AT
5 C
arr
ies
Video &
Pow
er
R
G
59+2 C
arr
ies
BALUN
BAL
UN
24v AC