ADT Commercial Fire & Burglary Alarm System FOCUS 200 PLUS, Installation And Setup Manual

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FOCUS 200 PLUS Installation and Setup Guide
12-8
Determining Maximum Length of Gateway Trunk Cable
After making sure that the input voltage to each device on the bus is sufficient, determine the
maximum length of each gateway trunk cable for a normal sensor load and also for a load that includes
horns/strobes, if used.
A Normal Sensor Load
A normal sensor load is one that does not include horn/strobes.
For a SIM Gateway
For a SIM gateway, there is no limitation to the maximum 1000-foot gateway trunk length as long as
the SIM gateway has at least 8.5 volts applied to it.
For a PID Gateway
To determine the maximum length of the trunk cable for a normal sensor load for PID gateway,
perform the following steps:
Step Action
1 Get the PID gateway Total Alarm Load in mA from Table 1.
2 Locate this value of current on the vertical axis of the curves shown in Figure 12-4.
3 Using a straight edge, go across to the right until you hit the curve that represents the
voltage applied to the gateway. Use the value of voltage obtained from the load diagram.
4 Using the straight edge, go straight downward to the horizontal axis. The distance that
is indicated is the maximum distance that can be used for the PID gateway trunk cable.
5 Repeat the steps for each gateway.
10.2V
10V 9.8V
9.6V
9.4V
9.2V 9.0V 8.8V 8.6V
0
100
200
300
400
500
600
700
800
900
1000
0 100 200 300 400 500 600 700 800 900 1000
Maximum Length of PID Gateway Trunk (feet)
Gateway Load Current (ma)
Figure 12-4: Determining Maximum Length of Quad Trunk for PID Gateway (no
horn/strobes)