Chapter 1 – Installation
9450 Duolink Exit Alarm Receiver Hardware Installation Guide Page 13 of 30
0510-1103-G
WARNING: The metal mounting bracket is integral to the tuning of the
DuoLink’s antenna. It must be installed on the DuoLink to get adequate
range performance AND to allow the exit controller to communicate with
the DuoLink. Any modifications made to the mounting bracket will
adversely affect the DuoLink’s performance and could cause an abduction
or an elopement to occur.
5. Make sure the exit controller has been properly mounted and the
power is turned on
6. Hold the DuoLink in its approximate final mounting location. Turn the
20-turn Gain Control clockwise until the LED first starts to blink. Once
the LED begins to blink, turn the Gain Control counter-clockwise one
full rotation (back 360°). NOTE: Turning the Gain Control clockwise
increases the sensitivity, turning it counter-clockwise decreases the
sensitivity.
7. Confirm the range and coverage using the DuoLink and a transmitter,
ensuring the area is covered properly while at the same time not
covering more than what is needed
WARNING: Some door receiver locations are relatively free of the typical
RF noise levels that are found at normal mounting locations in facilities.
For these locations, adjusting the door receiver gain control with the
standard tuning procedure (see step 6 above) can result in too much gain.
Excessive sensitivity to thunderstorm lightning RF noise, excessive
coverage into undesired areas, and over-sensitivity to random occurring
RF noise events (such as floor-buffer/polisher, RFI, and false auto-enrolls)
can be reduced or eliminated by testing the door receiver setup with a test
tag transmitter to confirm that the door receiver has 100% of the needed
coverage and not more. If coverage is tested and found to be excessively
higher than needed, reduce the door receiver gain control counter-
clockwise until there is 100% coverage at that location and not more.
8. Depending on whether the receiver is to be vertically or horizontally
mounted, you must maintain “horizontal” or “vertical” receiver
positioning while assessing the relative noise level
9. Move the DuoLink around in the desired receiver mounting area in
small increments (refer to the mounting configurations on the
following pages) to find a location where the signal LED blinks the
least
10. Mark the spot as it is the quietest radio frequency location and the
DuoLink should be mounted in that area for best performance
WARNING: If the DuoLink has to be moved significantly from the
recommended mounting location, the source of the noise must first be
identified and corrected, and then the location assessment must be
performed again.
11. Power off the exit controller
12. Disconnect the cable from the DuoLink and the exit controller and
proceed to mount the DuoLink
13. Repeat steps for every DuoLink to be mounted in the Exit Alarm Zone
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