excelPTZ PTZ200, Инструкция по установке и эксплуатации, Страница: 9 / 31

9
120
1# 2# 3# 31#
120
D
A+
B-
A+ B-
. . . . .
. . . . .
Main controller
Daisy-Chain connection WITH SHORT SPURS for the RS485 PTZ control signal
(one main radial with very short spurs to each dome off it, keeping the spurs to less than 7 meters)
TIP - The connection of a 120 termination resistor: JP1 is the 120
Ω
termination jumper found in the
dome head. When the jumper is set between positions 1 and 2 (i.e. between top and middle) the resistor is
connected and when the jumper is set between positions 2 and 3 the resistor is not connected.
JP1 1- 2 2- 3
120R ON OFF
ON
D
IP
1
2
3
4
5
6
7
8
9
10
ON
D
IP
1
2
3 4
5
6
JP1
1-2
2-3
120R
ON
OFF
JP1
STAR method of connection.
In some circumstances you may need to adopt a star configuration for practical purposes. For instance, all the
domes may be so scattered on a large site that running out separate spurs to each dome in a “STAR” array is
the only practical solution.
So how do you do this in practice?
The termination resistors must be connected to the two domes that are farthest away from each other,
1
2
3