System Description

TD 93025US
9 May 2019 / Ver. I 72
System Description
teleCARE IP
9.6.10 NILF Low Frequency Beacon
The low frequency beacon NILF is contained in a white plastic enclosure with a slim design
that is suitable for surface mounting on walls or at a door post.
Figure 66. NILF - Low Frequency Beacon
The NILF consists of an LF transmitter with a ferrite antenna. The NILF gives real-time
location information to teleCARE IP wireless devices enabling location based wireless call
functionality including wander Management.
The NILF transmits an LF ID signal which will be received and retained by any teleCARE IP
mobile transceiver which enters the coverage area. The NILF ID is transmitted by the mobile
transceiver with every event to determine the location of the mobile transceiver.
The NILF is powered by three 1.5V “C” (R14) alkaline batteries. When battery power is not
suitable a 24Vdc external power supply can be used.
The NILF operates at 125 kHz producing a spherical magnetic field with a range of up to 2.7
meters. The magnetic field strength can be adjusted to suit the requirements. A master/
slave configuration can be used to extend the range of the LF field.
An optional transceiver module NIRX can be mounted on the NILF circuit board used to
monitor the NILF through a heartbeat signal indicating that the NILF is still alive, it can send
out an alarm upon front cover removal detection (tamper alarm) or to send a low battery
alarm. A red LED will indicate low battery status (1 flash per minute) and tamper alarm
(continuous rapid flashing).
DIP switches are used to set the 12bit ID code, to select the transmission rate allowing a
suitable interval between 0.1 - 2s and to set the output power, ranging from 12 inches/
0.30m to 8.86 feet/2.7m.