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5-1
S E C T I O N 5
Gateways
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In This Section
♦
About the Gateways
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PID Gateway
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Installing the PID Gateway
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Installing Sensors to the PID
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SIM Gateway
♦
Installing the SIM Gateway
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Installing SIM and SIM Sensors
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RF Gateway
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Installing the RF Gateway
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Installing the RF Receiver
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5800 Series Transmitters
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Gateway Off-Normal Conditions
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About the Gateways
A gateway is an interface device for sensors and output devices. There are three types of gateways:
•
248239 PID gateway
•
472368 SIM gateway
•
472490 RF gateway.
The gateways connect to the RS-485 buses on the control unit and use Communication Group 03. Any
combination up to eight gateways can be used on the buses (maximum one RF gateway). The gateway
continuously monitors the status of all sensors. When interrogated by the control unit, it reports any
points that are off-normal. Additionally, when signaled by the control unit, the gateway issues
commands to reset sensors or control an on/off output function at appropriate points.
Each sensor and output device is identified by a Hard ID number. The control unit uses this
information, along with the number of the gateway on the RS-485 bus, to identify the point. This data
is programmed into the control unit at the time of installation.
RS-485 Buses
Each gateway connects to a port in the control unit via a cable known as an RS-485 bus. The control
unit can accommodate two independent RS-485 buses of 4000 feet each, permitting an end-to-end reach
of up to 8000 feet if using both buses. The total end-to-end reach can be extended to 16,000 feet by
using a 472430 RS-485 Repeater at the end of each bus. Current loading and voltage drop
considerations may limit the maximum allowable wire lengths on each RS-485 bus to less than 4000
feet. See the Power Requirements section for additional information.
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Страница 216: ...9 3l K3471V2 1 00 ADT Security Services Inc One Town Center Road Boca Raton FL 33486 Copyright 1999...