ExcelPTZ PTZ605 series Manual de instrucciones descargar pdf (Pagina 8)

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.

RS485 Wiring methods & Tips >>>>>

1. Characteristics of RS485

As specified by RS485 standards, RS485 is a half-duplex data transmission type with characteristic

impedance of 120 . The maximum load capacity is 32 units (domes, keyboards and DVRs).

2. Transmission distances of RS485 Signals using CAT5 or similar cables

Selecting a CAT5 or similar sized twisted pair data transmission cable, the maximum theoretical transmitting

distances are as follows:

Baud Rate Maximum

Transmitting Distance

2400 Bps (PELCO-D) 1500m

4800 bps 1000m

9600 bps 600m

BALUN

PTZ

DOME

24V24VA

LOCAL

PSU

240V ---

CAT 5

CAT5 Carries

Video &

Control Data

CCT CAMERA

Video

& Power

TRADITIONAL

CAMERA

JUNCTION BOXES

PSU

12V

240V

Free Lead Supplied

KEYPAD

DVR

CO-AX RG59

MONITOR

PTZ

DOME

RG59+2 Video & Power

CAT5 Carrying Data

CAT5 Carries Video & Power

RG59+2 Carries

BALUN

24V AC

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 57 58

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ExcelPTZ PTZ605 series Manual de instrucciones Pagina 8

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