Working Principle and Advantages and Disadvantages of Laser Barcode Scanner
When the user touches the power switch or the corresponding device to make the barcode scanner energized, the VLD sends out a red laser beam, which passes through the expanding lens to be expanded, and then shoots to the surface of the mirror which can be swung and reflected back to the barcode to form a laser point. When the mirror swing, according to the principle of optical reflection on the barcode laser point location changes, the mirror continuous swing, then we will see a red laser ray on the barcode, which is caused by the visual phenomenon of temporary retention. The surface of the barcode is rough, the laser point on the barcode reflection, bar and empty reflection intensity is different, diffuse reflection of light to the mirror, and then reflected by the mirror to the collector, the collector set of light, filtered by the filter off the stray natural light into the photosensitive diode, resulting in a photo-sensitive signal, and then amplified, shaping the decoding, into useful information, transmitted to the host computer.
The laser scanner is divided into handheld and fixed two forms: handheld laser gun connected to the line is convenient and simple, the use of flexible, fixed laser scanner is suitable for reading the most large, small barcode occasions, effectively freeing the hands of work.
Advantages: laser scanner can be used for non-contact scanning, usually, in the reading distance of more than 30cm when the laser reader is the only choice; laser reading barcode density range, and can read the irregular bar code surface or through the glass or transparent adhesive paper to read, because of non-contact reading, so it will not damage the bar code labels; because of advanced reading and decoding system, the first reading recognition success rate is high. Because of the more advanced reading and decoding system, the first reading recognition success rate is high, recognition speed relative to the light pen and CCD faster, and the printing quality is not good or fuzzy bar code recognition effect is good; false bit rate is very low (only about one in three million); laser reader shockproof and drop-proof performance is good, such as: Symbol LS4000 series of scanners, can be 1.5 meters of cement drop-proof.
Disadvantages: The only disadvantage of the laser scanner is that its price is relatively high, but if the total cost of purchase and use of the cost of calculating, and the CCD reader is not much difference.
Can not read the causes of failure and troubleshooting methods:
1) Not open to read the function of this bar code.
2) The bar code does not meet the specifications, such as the lack of necessary blank area, the bar and the empty contrast is too low, the bar and the empty pairs of the width of the ratio is not appropriate.
3) Direct sunlight, photosensitive devices into the saturation zone.
4) The surface of the bar code is covered with transparent material, the reflectivity is too high, although the eyes can see the bar code, but the collector reading conditions are strict, can not read.
5) Hardware failure, and your dealer contact for repair.
On the laptop, the barcode scanner on the keyboard interface does not work properly, or the barcode scanner is normal and the keyboard does not work:
On the laptop, the barcode scanner on the keyboard interface is equivalent to an external keyboard. The possible changes to a laptop's keyboard interface with a keyboard attached are:
1) The original keyboard is not working. The barcode scanner works and the keyboard does not.
2) The laptop's keyboard works and the external keyboard does not work. The barcode scanner does not work.
Solution:
1) Set the BIOS to make the external keyboard work through the automatic mode
2) Connect the keyboard interface to the barcode scanner
3) Connect the barcode scanner to the external keyboard
4) Or use the serial port barcode scanner
After reading a barcode, the barcode scanner is down:
1) Due to the barcode scanner is down, the barcode scanner works fine, but the keyboard does not work. p> 1) Due to the protection function of the barcode scanner, if the read barcode data is transmitted incorrectly, it will automatically enter the protection state, thus preventing the data from being lost. If the information that was not transmitted successfully is read, the barcode scanner can be reused.
2) If this phenomenon occurs, please carefully check the connection and agreement. After confirming that there is no error, turn off the barcode scanner, and then turn it on again can be used normally again.
The device can not be powered on:
1) bad power connection
2) fuse blown
3) barcode scanner power circuit failure
Faults that should be sent for repair:
1) abnormal indicator, the device can not work
2) abnormal sound
3) no radium rays
4) The scanning distance becomes very close... Wireless scanner gun usually have several kinds of information transmission:
1. Bluetooth distance of 10 meters or less, low cost
2. WIFI network distance of up to 100 meters, high cost.
The principle of transmission is to scan the digital \ text information through radio waves transmitted to the receiver, the receiver and then passed to the computer.
The principle of barcode scanner, barcode scanner principle is how?
A barcode reader is an electronic device that reads printed barcodes. Like a platform scanner, it consists of a light source, a lens and a light sensor to turn light into electrical impulses. In addition, almost all barcode readers contain decoder circuits that analyze the image of the barcode to provide information to the sensor and transmit the barcode content to the scanner's output port.
The scanning of the bar code requires a scanner, which uses its own light source to illuminate the bar code, and then uses a photoconverter to accept the reflected light, and convert the brightness of the reflected light into a digital signal. No matter what kind of rules are adopted to print the barcode, it is composed of static area, start character, information character and end character. Some barcodes also have a check digit between the information and termination digits.
▲Static area: the static area, also called the blank area, is divided into the left blank area and the right blank area, the left blank area is to let the scanning device ready for scanning, and the right blank area is to ensure that the scanning device correctly recognizes the end of the barcode mark.
In order to prevent the left and right blank area (static area) in the printing and typesetting was inadvertently occupied, can be printed in the blank area of a symbol (the left side of the print without the number of numbers & lt; No., the right side of the print without the number of numbers & gt; No.) This symbol is called the static area of the mark. The main role is to prevent the static area width is insufficient. As long as the width of the static area can be guaranteed, there is no such symbol does not affect the recognition of the barcode.
▲Starting character: the first character, with a special structure, when the scanner reads the character, it will start to read the program code.
▲Information character: the main content of the barcode.
▲Check digit: check if the read data is correct. Different encoding rules may have different checksum rules.
▲Termination character: the last character, with the same special structure, is used to tell the program that the code has been scanned, and also plays the role of just doing the checksum calculation.
In order to facilitate bi-directional scanning, the start and stop literals have an asymmetric structure. Therefore, the scanner can automatically rearrange the barcode information when scanning. Barcode scanners are light pen, CCD, laser three
▲ light pen: the most primitive scanning method, you need to manually move the light pen, and also with the bar code contact.
▲CCD: CCD as a photoelectric converter, LED as a light-emitting light source scanner. Within a certain range, it can realize automatic scanning. And can read a variety of materials, uneven surfaces on the bar code, the cost is also relatively inexpensive. But compared with the laser type, the scanning distance is shorter.
▲Radium: radium as a light source scanner. It can be categorized into several types, such as linear, omni-directional, etc.
Linear.
Linear: Mostly used in handheld scanners, far range, high accuracy.
Omniformity: mostly horizontal, high degree of automation, in a variety of directions can automatically read the bar code.
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Ordinary barcode scannerDepends on what interface ... Directly connected to the computer,
PS/2 interface, the scanner gun into the computer behind the keyboard interface, the keyboard connected to the scanning line on the transfer interface.
USB interface directly into the computer's USB interface can be
Then the scanner's red light on the barcode scanning on the line.
Android cell phone barcode scanner
Baidu I check put into the card and install it
Barcode scanner in several categories
Barcode scanner according to different application requirements can be divided into several categories as follows:
1, wired barcode scanner, wireless barcode scanner
2, one-dimensional barcode scanner, two-dimensional barcode scanner
3, general-purpose barcode scanner, high industrial-grade barcode scanner
If you have more automatic identification barcode related issues can consult Guangzhou Topin Information Technology Co. p>
3, configuration
Google Authenticator installed successfully for the first time the implementation of the need to configure a little before you can use. Tap Start Setup
There are two ways to add a new account scanning the barcode or enter the key provided
Note: The account is required to tie the Google Authenticator app or website will provide the QR code and key.
4. Enter the provided golden key as a demonstration, because scanning barcodes I personally feel how to work. Enter the app or website QR code and golden key. Tap Add
5, on the application successfully tied Google authenticator. Google authenticator will change every thirty seconds. This realizes the function of dynamic authentication code.
6, validation
7, configuration is complete after the tie to the required Google Authenticator application.
How to choose a barcode scanner
Buy a barcode scanner, you should focus on the following quotes:
1, scanning mode The scanning mode of the barcode scanner is mainly divided into CCD photomask type, laser scanning, image type. CCD photomask type scanning distance is relatively close, generally no more than 2 centimeters; laser scanning is more sensitive, but because of scanning the engine has a rotation of the mechanical parts, it is not drop-resistant; image type is generally speaking, the scanning distance is relatively close, usually no more than 2 centimeters. Not drop-resistant; image-based generally higher reliability, scanning depth of field is also relatively large.
2, the scanning speed that the number of times per second can be scanned
3, resolution, with the mil value to nominal (mil). In general, the smaller the value, the better.
4, interface mode Usually divided into keyboard port (KB interface), RS232 interface (serial port) and USB interface.
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