ExcelPTZ PTZ605 series Manual de instrucciones descargar pdf (Pagina 12)

method the end dome on each spur needs to have the 120ohm resistor enabled.

Although the RS485 distributor is a small additional expense, it takes some of the guess work out of the

installation design and gives a more flexible approach to cabling which itself can save time and money on

the installation. Not forgetting you get more predictable results!

The RS485 distributor (PTZ750) amplifies the RS485 control signal and distributes it evenly to 4 separate

spurs, each spur can have up to 4 domes. This means that you could theoretically have up to 4 individual

spurs of over 1000mtrs each to control up to 16 PTZ domes in total.

Ideally you would put just one dome on each spur from the PTZ750 but up to 4 domes is generally

acceptable. The following diagram shows a typical use of the PTZ750 RS485 distributor.

In the following example and diagram, domes 1,4,5 and 7 are at the end of each spur and therefore require

the 120ohm resistor enabling by moving the jumper setting within the domes. Domes 2,3 and 6 are all

“midway” in each spur and do not need the 120ohm resistor and can be left as default. The PTZ750 itself has

four 120ohm resistors built in as shown and you do not have to do anything with the PTZ750 as the resistors

are permanently connected within it.

(Diagram showing how to use an RS485 distributor to improve PTZ control reliability)

Please note if you have the PTZ750 located within 5mtrs of the keypad or DVR you can connect up

to 3 of them in parallel.

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ExcelPTZ PTZ605 series Manual de instrucciones Pagina 12