Interlogix Alliance AL-4017, Руководство по установке

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7
System bus connections
Connect DGP devices to the system bus to provide extra zones and remote arming stations (RAS) to the control
panel. Remote devices can be up to 5,000 ft. (1.5 km) from an Alliance system control panel. DGP and RAS
devices must be connected via a twisted-pair, shielded data cable from the system bus connection. We
recommend you use Beldon 8723. Connect the shield of the data cable to earth at the control panel and leave it
disconnected at any other end. Where the distance between the arming station and the nearest device is more
than 328 ft. (100 m), use a separate power supply to power the arming station. To power the arming station do
not connect the (+) from the system bus, connect the (+) of the local power supply to the (+) on the arming
station and connect the (0 V) from the power supply and (0 V) from the system bus to the arming station (-)
terminal (
Figure 5
). The first and last devices on the system bus must be terminated. All other devices on the
system bus must not be terminated.
Figure 5. System bus connection
Shielded cable routing
Connect the shielding of all shielded cables used in the system at one side to one common earthing point in a
building. If a shielded bus cable is routed via more than one plastic device, you must connect the shielding
from in-coming and out-going cable (
Figure 6
). Metal chassis must be earth grounded. Splice shield drain wire
at all junctions.
Figure 6. Shielded cable routing
System bus
D- D+ 0V
D- D+ 0V+12
D- D+ 0V+12
DGP RAS Control panel
12 V connection
System bus
D- D+ 0V
D- D+ 0V+12
D- D+ 0V+12
DGP RAS Control panel
Cable shielded drain wire
Shield drain
wire ground