ExcelPTZ PTZ605 series Manuál s instrukcemi stáhnout pdf (Strana 14)

summer but when winter kicks in and the dome’s current draw jumps from 400ma to 1.25A, an inadequate

power supply or a cable with too much voltage drop may stop the dome from working properly. When winter

comes don’t be suddenly caught off guard when your customer rings you to say the dome has suddenly

packed in because it’s gone cold!!

A popular way to power the domes is using our COMPOSITE VIDEO cable (or

shotgun as its also known) as this cable can carry the power to the dome and the video

signal back to the monitor or DVR. Alternatively the COMBO cable also

provides the RS485 data cable.

The power connection

The RED & BLACK cable coming out of the dome

connected to the RED terminal block are for power.

Connect a suitable 24V A.C power supply to this pair of

cores.

The BNC connector is the “VIDEO-OUT” from the camera

and goes to the monitor or “VIDEO-IN” of a DVR camera

input.

The Orange and Yellow pair of cores that go in to the

BLACK terminal block are the data cables. These are the cores that carry the RS485 control signal to the

dome from either the keyboard or the DVR. The next section of the instructions gives more detail on how to

connect the RS485 data. Please also read the RS485 WIRING METHODS & TIPS section towards the

beginning of these instructions.

Power cable requirement – Assuming a starting voltage of 24V A.C is applied at the PSU end.

Composite cable Heater OFF Heater ON

Maximum run 80mtr 70mtr

The distances are relatively short due to the high load of the dome when it starts up. If the voltage of the

dome drops below around 20V A.C it will fail to initialise. Obviously you can power the domes locally if

you wish.

RS485 connection - Connecting the Keypad or DVR to the Dome.

The dome is controlled by an RS485 data signal that is given by either a KEYPAD

or a suitable DVR. This data signal tells the dome to pan, tilt, zoom etc. Its

important that you read the early section of these instructions to understand the

fundamental principle of RS485 cabling techniques so that you get it right.

RS485 has two cores, A and B or sometimes known as RS485 + (A) and RS485 –

(B) if you get these two the wrong away around then you will not be able to control the dome. Sometimes

installers get the connections right on one dome but not on the other and find only one dome works. They

then swap the wires around at the keyboard only to find out one dome has now burst in to life and the other

one now failed!! But they don’t put 2 + 2 together and realise their mistake that they have wired one dome

different to the other. Take great care getting these the right way around and make sure you wire each dome

IDENTICALLY so that if you have to swap the A & B lines over at the keyboard you know all domes are

wired the same!!

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ExcelPTZ PTZ605 series Manuál s instrukcemi Strana 14