Aritech ATS4000 Instrukcja Obsługi Pobierz pdf (Strona 44)

44 ATS Designers Guide

reader inputs have been doubled as local bus devices – readers (local bus RAS) with

addresses from 1 to 4.

3.2.2 ATS1290 addressable sensor DGP

The ATS1290 addressable sensor DGP uses the PointID

interface for communications.

It is a serial, bi-directional, open–topology interface. Its range is limited only by the load of

the devices connected to the bus. The bus can have either two or four wires, depending

on the power supply assumptions for the devices.

A supplement for the DGP is a set of sensors and other addressable devices, listed in

Table 3-10. These are popular PIR sensors, also equipped with anti-masking capabilities,

and a set of universal devices for use with standard alarm equipment.

Using the addressable device technology enables:

• Shortening of the installation time;

• Decreasing the cost and complexity of the wiring;

• Simplifying extensions for existing systems and projects.

Connecting advanced sensors, equipped with anti-masking, Walk-Test capabilities, or the

control of LEDs, often requires cables with 6 or more wires. Besides, each sensor needs

to be connected via a separate, cable, and should be properly installed. Often the wiring

loom consists of tens of cables many wires each. Adding new elements often requires

laying out a cable from the nearest expansion to the detector. The addressable device

system is free from such limitations. Only one cable is necessary, laid out from sensor to

sensor, DGP to connection box etc. in an arbitrary fashion. The cable can also be the

same one that provides the system bus signal, and adding a new sensor consists of only

connecting it to the nearest existing device.

Table 3-6 Point ID interface parameters

Parameter Value

Device communications Voltage based PPM

DGP communications Synchronous CPM

Addressing Device: DIP, DGP: learning

Packet transmission time Device 8ms, DGP 4ms

Number of wires 2/4

Number of devices 32 (256 addresses max.)

Max. Length 1500m

Termination No

3.2.2.1 Wiring.

There are two ways to design a Point ID

bus, depending on the power supply of devices

connected to it:

• Power supplied directly form bus – two wire bus;

• Power supplied form an external source – 4-wire bus.

Although there are no limitations as to the type of wires used for the bus, it is necessary

to use wires with the lowest possible resistance and capacity to achieve the maximum

bus length – 1500m. Drawing 3-15 shows several possible bus topologies used during

testing.

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