Introduction
The Genesis range of wireless Passive Infra Red Detectors (PIR) have been designed to
meet the newest and most demanding requirements of the CCTV market. These detec-
tors provide the versatility of wireless whilst meeting and surpassing the requirements
needed for a BS8418 system.
The whole wireless PIR system will comprise of one receiver and perhaps one or more
repeaters but these are only required on extremely large or difficult sites.
The receiver can either directly interface with a dome camera or can connect to a relay
control unit . The receiver can also connect directly to some third party DVR’s and trans-
mission systems.
LGMT434 Masthead Repeater Installation Handbook Page 2.
How the system works.
At the heart of the system there is a Masthead which receives the data
transmitted by the PIR detectors. See Fig 1.
Each time a PIR detects movement it transmits data to a masthead. This masthead
then does two things. Firstly it re-transmits the data and attaches a text string to it
which can be received by either a Pager (LGP434) or Walk Test Instrument LGWT434).
These devices will display the ID number and name of the PIR such as “Main Gate” etc.
The walk test unit shows additional information such as the PIR’s battery status, pulse
count setting and software version as well as the signal strength at the masthead.
The second thing that the masthead does is to pass data via an RS232 link to an alarm
system such as the LGRU64 relay control unit with up to 64 alarm relay outputs and a
further 64 tamper relay outputs. This control unit keeps a log of events and provides
text for video insertion.
Alternatively, the masthead may be connected directly to some popular DVR/
transmission systems thus illuminating complex and costly wiring.
Transmission from the detector to the masthead transceiver can be up to 1km line of
sight but may be extended to many kilometres by using repeaters.
A masthead unit can simply be converted to become a repeater by just a switch
change.
The PIR detectors CALL IN every 5 minutes with an IM’E STILL HERE message.
The LGRU64 and some third party products will give an alert if any of the PIR’s logged
on the system fail to call in.
Another alternative to the Masthead is the LGMR4x4 which is a masthead with relay
outputs for direct connection to a PTZ or Dome camera. (See separate instructions.)
