How the barcode scanners working

Automatic control or tracking of work-in-progress on manufacturing lines, or automatic sorting of items on conveyor belts, requires accurate, reliable and unattended bar code identification.

The fixed barcode scanner can have various external dimensions, scanning forms, reading resolution, scanning distance, scanning area, reading depth of field, installation method and interface mode, and can also form a barcode scanning network to work in groups. Coupled with sensors and a variety of advanced intelligent analysis techniques, it can perform any complex bar code automatic identification in various environments and transfer data or signals to computer or PLC. The specific solution is based on the specific application environment and requirements and constraints. The following describes how several barcode scanners work.

Counter barcode scanner

In retail chains, convenience stores, bookstores, or pharmacies, cashiers usually take merchandise to the counter for bar code scanning. The benchtop barcode scanner is compact and is usually placed on the cashier counter and connected to the POS system. It forms a plurality of intersecting mesh scan lines through a large scanning window, thereby achieving omnidirectional barcode scanning. The operator does not need to carefully adjust the direction of the barcode, and can quickly and easily read the product barcode to speed up the checkout process.

Handheld barcode scanner

Handheld barcode scanners are the most commonly used and most flexible barcode scanning recognition devices, generally available in laser, linear array CCD and matrix CCD. They are suitable for scanning items of different sizes and shapes. The operator can work at a fixed site or move to a handheld data terminal or an in-vehicle data terminal. Readable barcode system (one-dimensional or two-dimensional, stacked or matrix), scanning distance, depth of field, reading resolution, industrial level, interface mode, shape structure, application and feedback information Factors must be considered when choosing a handheld barcode scanner.

wireless barcode scanner

In general, handheld barcode scanners need to be connected to a PC, POS or other fixed terminal via a cable to work. In most cases, this mode of work is acceptable. However, in some cases, the operator needs to perform bar code scanning work in a large range, and the communication cable becomes a great limitation. The wireless barcode scanner uses a large-capacity rechargeable battery to replace the cable connection by wireless communication, frees the distance between the fixed computer and the mobile computer. In addition to point-to-point communication, a wireless barcode scanner can communicate with a computer through a wireless communication base, and can realize multi-point to one-point communication, that is, multiple barcode scanners pass through a wireless communication base. Computer communication, which wirelessly connects multiple barcode scanners to the same communication interface of the computer.

An important feature of 2D barcodes is their high code density, which is especially suitable for the automatic control and tracking management of small size products such as printed circuit boards and electronic components manufacturing processes. The fixed two-dimensional barcode reader integrates modules such as illumination, graphic acquisition, image processing, decoding and communication with matrix CCD image technology, which can quickly and easily identify one-dimensional barcodes and stacked in an omnidirectional manner. 2D barcodes (such as PDF417) and matrix 2D barcodes (such as Datamatrix and QR codes). Thanks to its very compact construction and omnidirectional identification, fixed 2D barcode readers can be easily integrated into automated production lines or in automated equipment.