ExcelPTZ PTZ605 series Manual de instrucciones descargar pdf (Pagina 7)

You can get “composite” cables that will carry both the power and the video

signals and this has the benefit of combining two of the three cables into one.

You may choose to power the dome locally to it, so you may only need to get

the video signal back from the dome and the RS485 control signals to it. If this

is the case you may choose to use a pair of BALUNS. By using baluns you can send the video signal and

control signal down the same CAT5 cable just using different cores for each signal.

The control signal (RS485) is nearly always sent along a “twisted-pair” type cable. The twists in the cable

help prevent interference affecting the data signal by “shielding” it. Many 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!

Equipment Cable Needed Dome

1. Data signal

CAT5 cable

You can also send the video signal

back along a second pair in a CAT5

cable using baluns. Note you cannot

send 24v AC power down CAT5.

2. Video signal

RG59 or similar

You can combine both the video

and power into one cable if you

wish using composite cable.

3. Power

Two core cable capable of carrying at least

1.2Amp @ 24V AC.

Keypad or

DVR

Monitor

Power Supply

24V AC

Out

Display Equipment

Control Equipment

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ExcelPTZ PTZ605 series Manual de instrucciones Pagina 7