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

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Section 12 – Power Requirements
12-9
A Sensor Load for a SIM or PID Gateway that Includes Horn/Strobes
To determine the maximum length of the trunk cable for a sensor load that includes horn/strobes,
perform the following steps:
Step Action
1 Make sure that gateway will have at least 9.7 volts from the RS-485 bus.
2 Get the gateway trunk load in mA from Table 1 for a PID gateway, or Table 2 for a SIM
gateway.
3 Locate this value of current on the vertical axis of the curves shown in Figure 12-5.
4 Using a straight edge, project across to the right until you meet the curve that represents
the voltage being applied to the gateway. Use the value of voltage obtained from the load
diagram.
5 Using the straight edge again, project a line straight downward to the horizontal axis.
The length that is indicated is the maximum length that can be used for the trunk cable
for either a PID gateway or a SIM gateway.
6 Repeat the steps for each gateway.
10.2V
10.1V
10.0V
9.9V
9.8V
9.7V
0
100
200
300
400
500
600
700
800
900
1000
0 100 200 300 400 500 600 700
Maximum Length of Gateway Trunk (feet)
Horn/Strobe Load (ma)
Figure 12-5: Determining the Maximum Length of Quad Trunk for SIM/PID Gateway with
Horn/Strobes
Determining the Control Unit Power Supply Load
Use the tables below to calculate the total current for the RS-485 Bus #1, RS-485 Bus #2, Aux Relay
(terminal 10 when wet), Bell 1, and Bell 2 outputs. In each worksheet, multiply each device's standby
and/or alarm current by the number of units used.