Cooper Menvier 9752, Инструкция по установке и программированию

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3. Installation
Cabling Keypads and Expanders
Cooper Security recommend that you use 8-core 7/0.2 or 16/0.2 alarm cable
for wiring keypads and expanders.
You can connect the keypads and expanders in either a star or bus configu-
ration (see Figure 6). If you are intending to use long cable runs then Cooper
Security recommend that you use star wiring.
Control Unit
Keypads or expanders Distribute devices along
cable for better performance.
200m
200m 200m
200m 200m
Figure 6. Star and Bus Wiring for Keypads and Expanders
The maximum length of any one run from control unit to the most remote
keypad or expander depends on the number of items connected to the cable.
You can double or triple the maximum length by doubling or tripling the
number of cores attached to the 0V and 12V terminals of each item. The
table below shows the maximum recommended cable lengths in metres,
assuming that you connect all items at the end of a single cable run. (An item
is either a keypad or an expander.) In real life you may be able to improve on
these figures by spreading items along the cable length (figure 6).
7/0.2 8-core cable 16/0.2 8-core cable
No items 1 core 2 cores 3 cores 1 core 2 cores
One 200 400 600 400 800
Two 100 200 300 200 400
Three 65 130 185 130 260
Four 50 100 150 100 200
Five 40 80 120 80 160
Six 33 66 99 66 132
Seven 28 56 84 56 112
When carrying out the cabling there are two important points to remember:
1. Do not connect anything other than keypads and expanders to the keypad
bus. The keypad bus power supply is limited to a maximum of 400mA and
can supply no more than a maximum of four keypads and four expanders.