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Hardware Installation Guide
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Use Single Point Grounding (Earthing). No ground loops.
The LPLR-911 has a uni-directional antenna with an antenna beam width of about 60-70 degrees. The
radiation pattern is an oval-shaped beam, which should be aimed toward where the transponders will pass.
For best results, the antenna should be mounted on a post, about 6 to 7 feet above pavement, with the
antenna angled slightly downward toward a vehicle passing through the drive lane. The 11 foot tip of the
antenna radiation pattern should reach the windshield directly in front of the passenger or driver. Install
readers for neighboring vehicle lanes so that the effective areas for detecting tags do not intersect. Only one
reader should be able to read a tag at any location of the tag. Be sure to elevate the antenna slightly to
accommodate sport utility vehicles, minivans and trucks.
Note:
An additional installation kit (part number LPLRIN) is required for the LPLR-911.
Wiring Requirements
All the reader wiring must be continuously shielded. Use 22 AWG up to 18 AWG, six or seven-conductor
shielded cables. Longer distances and higher current consumption on the power supply line will require
larger gauge wires. Due to system data termination differences, contact your panel manufacturer for the
proper wire sizes to meet the specific requirements.
Power Supply
For consistent performance, choose a high-efficiency switching power supply with remote sense and use the
voltage sense wire to ensure consistent performance. Alternatively, use a linear, regulated power supply with
sufficient current capacity.
Grounding
Grounding is critical for proper operation of a system with LPLR-911 readers. When installing the
controllers, it is crucial to assure that the earth ground is the best ground available. If you elect to use the 120
VAC power ground, conduct a test by measuring its resistance relative to a known good ground, such as a
cold water pipe or structural steel that is in direct contact with the ground. The resistance should be less than
50 ohms. If you find that the AC power line does not provide adequate earth ground, try using a solid
connection to a cold water pipe.
For multiple controller installations, it is critical that all panels are connected to the same grounding system.
Using different grounding systems will create secondary current paths or ground loops that can affect the
performance and cause damage to the readers.
The Shield (Drain) wire of the reader cable should be connected to the shield of the extender cable between
the reader and the panel. If there is no extender cable, the reader's Shield (Drain) wire should be connected
to nothing. Do not connect the extender cable's shield to ground at either end – not at the reader and not at
the panel.
Measuring Reader Distance
The WS transponder for this reader is designed for windshield mounting. To measure the read range between
the reader and the transponder, the transponder must be placed behind a piece of glass about 0.25 inches
thick and the transponder must be flat against the glass. Grasp the transponder by the edges and hold the
transponder so that the copper circuit faces the reader. Move the transponder toward the reader, with the card
surface parallel to the reader, until a BEEP occurs (using the SP-6820-LR test unit). The BEEP indicates that
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revision 7 —
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