RFT 9450 - Introduction; System Verification; Tuning and Testing the DuoLink; Chapter 3 - Mounting Raceway Hardware

Chapter 2 – Testing
9450 Duolink Exit Alarm Receiver Hardware Installation Guide Page 23 of 30
0510-1103-G
Chapter 2 – Testing
Introduction
The DuoLink’s location must be tested for interference and coverage.
Located on each DuoLink is a Red or Green LED, depending on the
frequency (refer to Figure 1.2 on page 10), that provides a visual aid.
When the DuoLink receives any signal in the same frequency range as
the transmitter, the LED lights. For the system to operate properly, the
LED must be OFF when a transmitter is not present. The system will
tolerate a small amount of interference which appears as a dim flash of
the LED, but the best performance is achieved when the LED remains
OFF.
The DuoLink must be tested and tuned on a regular basis or any time that
they indicate noise or that the environment around them has been
changed.
NOTE: The Signal LED on the exit controller also shows when
interference or a signal is being received. However, this is a composite of
all of the antennas. When more than one DuoLink is connected to the exit
controller, the DuoLink’s LED must be used to determine which DuoLink is
receiving the interference or signal.
System
Verification
Tuning and Testing the DuoLink
Ideally, the DuoLinks’s gain should be adjusted to the setting necessary to
supply the desired coverage area. Tuning the gain up can give additional
coverage but makes it easier to flood the DuoLink with noise. Tuning the
gain down is less likely to flood the DuoLink with noise but may not
provide adequate coverage.
Once the system has been tested, you must perform the Antenna Survey
(**9450 1301) again.
WARNING: A minimum gain setting is necessary to ensure that the
transmitter's signal will be received. If the gain must be adjusted below the
minimum setting to receive a “reliable” signal, reorient or relocate the
DuoLink. Adjusting the gain below the minimum setting can cause the
abduction or elopement of patients/residents and/or system failure.
NOTE: When the exit controller is in test mode (** 9450 88 1), the Red
Signal LED should only blink when it decodes the test transmitter and not
constantly. If it blinks constantly, there are other transmitters in the
monitored zone that must be removed.
If the installation area contains noise, the Yellow Signal LED may blink
outside of successful transmitter decodes which is acceptable only if the
Exit Alarm System passes the above testing.
If the Yellow Signal LED blinks constantly after attempting the above
tuning, the source of the noise must be identified and corrected.