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RFID reader read zone At an automatic checkout lane, the RFID reader identifies the member at the head of the queue and triggers the gate. Getting the read zone right is the difference between a smooth, hands-free entry and a frustrated member at a closed gate, or worse, a gate that opens for the wrong car. RFID readers and tags are useful if do not want to use LPR or if a particular license plate is too difficult to read, e.g. it has a privacy cover.

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Read Zone

The RFID reader emits a directional beam of radio energy, typically referred to as the antenna’s read zone. A tag is detected only when it sits inside this zone with enough signal strength to respond.

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What to Detect

A correctly aimed read zone covers a single goal.
  • Detect the tag of a vehicle stopped directly in front of the gate, i.e. at the head of the queue.

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What to Avoid

  • The next vehicle in line, waiting behind the lead car. Reading this tag early opens the gate for the wrong member.
  • Drive-by traffic in adjacent lanes, parking areas, or the street. Stray reads trigger unwanted gate opens and inflate visit counts.

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Mounting and Aim

Our RFID readers use PoE so you only need to run one CAT5E cable to the reader. Two mounting approaches reliably contain the read zone to the lead vehicle:

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Side Mount, Angled Down and Inward

Mount the reader on a post or pole beside the lane, at roughly windshield height. Aim the antenna down and toward the center of the lane, so the beam intersects the pavement just in front of the gate. This is the most common installation. The downward tilt prevents the beam from reaching the next car in line. The inward angle keeps it off adjacent traffic.

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Overhead Mount, Pointing Straight Down

Mount the reader on a canopy or arch directly above the stop position, with the antenna pointing straight down. The read zone forms a tight footprint on the pavement directly under the antenna. Overhead mounting is the cleanest option when the site has existing structure to support it.

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Verifying the Read Zone

After installation, walk a test tag through the lane to confirm:
  1. The tag reads when held inside a vehicle stopped at the gate.
  2. The tag does not read from the next stop position behind the gate.
  3. The tag does not read from adjacent lanes or drive-by paths.
If reads occur outside the intended zone, adjust the tilt, reduce the reader’s transmit power, or both. Small angle changes have a large effect on where the beam lands.
For troubleshooting power, network, and read failures on an installed reader, see RFID Reader. For vehicles that interfere with RFID at the windshield, see LPR and RFID Limitations.