When the barcode scanner feedback NG (indicates that the barcode cannot be scanned or recognized successfully), the possible reasons and solutions can be summarized as follows:

Possible reasons

Barcode problem: The barcode does not meet the specifications, such as the lack of necessary blank areas, the contrast between bars and spaces is too low, the width and narrowness ratio of bars and spaces is not appropriate, etc.

The barcode is damaged, contaminated or too blurred.

The scanned barcode is incomplete or seriously damaged.

Scanning device problem: Hardware failure of the scanning device, such as damage to the optical head or motherboard.

Scanning device setting problem, such as the serial port gun does not correctly set the serial port number and baud rate, or does not set the scanning code system.

Scanning device power supply problem, such as insufficient power supply, poor contact or damage of the data cable interface.

Environmental factors: The light in the scanning environment is too strong or too weak, such as direct sunlight or insufficient light.

The surface of the barcode is covered with transparent materials, resulting in excessive reflection.

The input method is not closed during scanning, resulting in scanning interference.

Operational problem: The distance is too far or too close during scanning, and the angle is too large.

The cursor is not in the scanning area during scanning.

The wired scanner is not connected properly or is not connected to the computer properly.

Solution

Check the barcode: Make sure the barcode is complete, clear, and in compliance with the specifications.

If the barcode is damaged or contaminated, try to clean or replace the barcode.

Check the scanning device: Check whether the hardware of the scanning device is intact. If it is damaged, contact the dealer for repair.

Check the manual of the scanning device, check and set the correct serial port number and baud rate, as well as the scanning code system.

Check whether the power and data cable connections are stable. If necessary, replace the new power or data cable.

Adjust environmental factors: Scan in a moderately lit environment, avoid direct sunlight or too dark light.

If the barcode surface is covered with transparent material, try to remove or replace the material.

Turn off the input method to avoid interference during scanning.

Note: Maintain an appropriate scanning distance and angle, and make sure the cursor is in the scanning area.

For wired scanners, make sure the cable is connected correctly and stably.

The above steps can usually solve the problem of barcode scanner feedback NG. If the problem persists, it is recommended to contact the equipment supplier or professional technical support team for further investigation and resolution.