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Fleetwatch FMS · Fuel Lane Hardware
Checking the SRF55 Vehicle Detector (Transaction Reset Sensor)
The SRF55 is an overhead sensor that detects when a vehicle is parked in the service lane. It connects to a control module (the “black box”) wired into the JB20 junction box. When the vehicle drives away, the system resets the RIH transaction and the RIH prompt returns to Employee, ready for the next vehicle.
Reading the Green LED on the Black Box
| Green LED | What it means |
|---|---|
| Off | Normal No vehicle under the sensor. |
| On steady | Normal A vehicle is parked under the sensor. |
| Flashing | Problem The black box can’t communicate with the overhead sensor. |
⚠ Before you open the JB20
The JB20 junction box contains live power. Only qualified personnel should open it or work on its wiring.
Troubleshooting
Start by checking the green LED on the black box with the lane empty. Then follow the path that matches what you see.
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If the LED is flashing
Check the sensor wiring
The black box and the overhead sensor aren’t communicating.
• Check the wiring between the overhead sensor and the black box.
• The most likely causes are a bad connection at the overhead sensor or a bad sensor.
• Use the wiring table below to confirm each wire is on the correct terminal.
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If the LED is not flashing
Reset and test with a bus
1. Clear the lane of vehicles and personnel so nothing is under the overhead sensor.
2. Cycle power to the Fleetwatch system using CB1 in the JB20.
3. Bring a bus in under the sensor. The green LED should light up.
4. Move the bus out. The LED should turn back off, and the RIH should return to the Employee prompt.
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Park Under the Sensor
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During servicing, vehicles must be parked under the SRF55 vehicle detector. If a vehicle stops short of or past the sensor, the system thinks it has left and may reset the transaction unintentionally. If the RIH goes back to the Employee prompt while a vehicle is still being serviced, first check that the vehicle is parked in the correct position under the sensor.
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Wiring Reference
| Wire | Function | On board | To JB20 |
|---|---|---|---|
| Brown | Power in (board) | CONN1 – Pwr | 5VDC (Veh. Det. Block) |
| Black | Ground (board & SRF55) | CONN1 – Grd | GND (Veh. Det. Block) |
| Blue | Vehicle det. ground | CONN9 – Grd | 23 (I/O Block) |
| Yellow | Flow reset 0 | CONN9 – Out0 | 25 (I/O Block) |
| Red | Power (SRF55) | CONN11 – Yes | P (Veh. Det. Block) |
| White | Signal (SRF55) | CONN3 – Rx | S (Veh. Det. Block) |
Check the wire pairs on I/O Block terminals 23 and 25
| Terminal | Top wire | Bottom wire |
|---|---|---|
| 23 | Blue | Purple |
| 25 | Yellow | Yellow |
Make sure the blue wire on top goes with the purple wire on the bottom, and the yellow wire on top goes with the yellow wire on the bottom.
Full wiring diagram: the black box (with green LED), the vehicle detector terminal block (P, S, F, GND, 5VDC), the 5V power supply, I/O block terminals 23 and 25, and CB1/CB2 in the RIH junction box.
Green LED still not behaving as expected? Contact Fleetwatch Support.