Locators; Ir Slave Locators; Lf Antennas; Ir And Lf Detection - ASCOM T942C System Installation

System Installation
Ascom Paging System
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Locators

Note: Locators are not applicable if only paging is to be used in the Ascom Paging System.
The Locators transmit a location code via infrared (IR) or low frequency signals (LF). The
location code consists of four hexadecimal characters, 0000-FFFE, that are selected with
two dip switches in the Locator. The Transceiver/Transmitter handset receives the location
code and stores it. When an alarm is sent the location code is transmitted together with
other alarm data.
The Locators can be equipped with a monitor output with breaking function. The output
can be connected directly to an alarm module.
6.1

IR Slave Locators

Up to three IR Slave Locators can be connected to one IR Master Locator. Max total wiring
length for these locators is about 100 metres.
The IR Slave Locators can have separate power supplies but must have a common ground
with the Locator.
6.2

LF Antennas

Up to two external LF antennas can be connected to an LF master locator. Max total wiring
length is about 20 metres. Only twisted-pairs are to be used.
6.3

IR and LF Detection

Transmitted infrared light can be detected as visible light by placing an IR-sensor screen
directly in front of the locator IR-window. An a71 alarm transceiver can be used to detect
the magnetic field from the LF locator and the infrared light from the IR locator. The a71
alarm transceiver displays the location code together with the time since the last code was
received in hexadecimal form.
10 October 2013 / Ver. D
TD 90227GB
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