The popularity of the high-definition license plate recognition system effectively solves the problem of the community management vehicle. The same license plate recognition system has always had some problems. Let's take a look at the common faults and troubleshooting methods of HD license plate recognition system.
Fault 1 description: the card gate is not open
Analysis: card expired, invalid card, card has entered (out) field, card machine motherboard failure, barrier failure
Processing method: 1. Listen to the system voice, confirm the validity of the card, and exclude the card from being illegal; 2. Brush the legal card, and measure whether there is +12V output between the signal OPEN and GND output by the card machine at the gate end, and eliminate the card machine. Motherboard and line problems; 3, through the triple button to open the gate to eliminate the gate failure. 4. On the card machine, directly connect VCC and OPEN to see if the gate is open, and eliminate the line and gate problems.
Fault 2 description: The controller does not respond to the card (no voice, no brake)
Analysis: Card non-HD license plate recognition system card, the card machine feels dead due to the uncompressed ground reading card, the card reader antenna connector is unplugged or damaged, the hardware on the control board is not installed or has problems;
Approach:
1. Determine the card as a card that has been kept secret by the HD license plate recognition system ;
2. Check if the OUTPUT light on the ground sensor of the card machine is always on (normal), restart the card machine after power off, and re-press the ground to read the card;
3. Check if the connector of the card reader antenna is properly connected to the motherboard, and replace the antenna board test;
4. Check if the hardware on the motherboard is properly installed.
Fault phenomenon 3: The car does not go off.
possible reason:
1 The ground sense coil is buried incorrectly or the coil is damaged or broken;
2 Vehicle detector power shortage (Max250mA) or improper sensing sensitivity (too high or too low); 3 "Sense" of the "COM" terminal is disconnected or poorly connected to the "GND" common ground of the gate controller .
Fault phenomenon 4: Click the [Open Gate] button in the monitoring interface, the gate is not open, but the manual button can be used to open the gate.
possible reason:
1 The “control switch†in the card reader is not short-circuited (it is disconnected at the factory and is in offline working state. When it is connected with the computer, it must be short-circuited online);
2 The computer and the card reader cannot communicate normally, and the controller does not receive the open command. (Check if the connection of the computer serial port is normal and the parameter setting is correct)
Symptom 5: Read the card on the exit and entrance card readers. The card number transmitted to the computer is sometimes correct (can be opened), and sometimes it cannot be opened.
possible reason:
1 line encounters strong interference (such as co-management of communication line and AC power line);
2 The line is too long, beyond the effective communication distance (200M), the signal is seriously degraded;
3 The card reader controls the grounding terminal (signal ground) of the main board to be short-circuited with the AC power ground (power ground), causing communication interference;
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