Access Control System Common Problems and Solutions

May 28, 2023

With the development of our country’s economy, access control has become the first barrier to the protection of security. However, due to the uneven quality of access control products in access control, it will inevitably lead to failures. Therefore, this issue has been introduced in detail for the phenomenon of frequent failures in access control systems.

Symptom 1:

After the access control equipment is connected, the software cannot communicate with the computer.

Possible Causes When Using RS422 Communication:

(1) The wiring between controller and network extender is incorrect.

(2) Jumper switch on the controller is in the closed state (communication mode is RS232);

(3) The distance from the controller to the network extender exceeds the effective length (1200M);

(4) Whether the serial port of the computer is normal, whether there is a normal connection or is occupied by other programs, and retesting after excluding these reasons;

(5) In the software setting, the actual setting and connection of the device address number do not correspond;

(6) Line interference, not normal communication.

Possible causes when using RS232 communication:

(1) The wiring between the controller and the computer serial port is not correct;

(2) The jumper switch on the controller is in the disconnected state (communication mode is RS422);

(3) The distance from the controller to the computer exceeds the effective length (15M);

(4) Whether the serial port of the computer is normal, whether there is a normal connection or is occupied by other programs, and retesting after excluding these reasons;

(5) In the software setting, the device address number does not correspond to the actual setting or connection;

Symptom 2:

When the card is near the card reader, the buzzer does not sound and the indicator light does not respond. The communication is normal.

Possible Causes:

(1) The connection between the card reader and the controller is incorrect;

(2) The reader to controller line exceeds the effective length (120M);

Symptom 3:

The valid card is close to the card reader, the buzzer sounds, the LED indicator has no change, and the door cannot be opened.

Possible Causes:

(1) The connection between the card reader and the controller is incorrect;

(2) The line is seriously disturbed and the card reader data cannot be transmitted to the controller;

Symptom 4:

The use of the access controller has been normal. One day it suddenly found that all valid cards cannot be opened (invalid card).

Possible Causes:

(1) The operator sets the access controller to rest (no cards can be opened at rest);

(2) The operator has initialized the access controller or other reasons causing the controller to execute an initialization command;

Symptom 5:

Move the valid card close to the card reader. The buzzer sounds and the LED indicator turns green, but the door lock is not open.

Possible Causes:

(1) The connection between the controller and the electronically controlled lock is incorrect;

(2) Whether the power supply to the electric lock is normal (the electric lock requires a separate power supply);

(3) Electronically controlled lock failure;

(4) mechanical locking of the tongue and lock;

Symptom 6:

The card will be effectively approached, the buzzer will sound, the door lock will be open, but the light of the card reader will be off.

Possible Causes:

(1) The controller and the electronically controlled lock share a single power supply, and the reversed potential interferes when the electric lock is in operation, causing the controller to reset;

(2) The power supply is insufficient, causing the controller and card reader to not work properly.

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Liên hệ chúng tôi

Author:

Ms. Yanjun Chen

E-mail:

quentin@zecheng.com.cn

Phone/WhatsApp:

+8613602572892

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