Barcode Scanners, also known as barcode scanners or barcode readers, are devices used to read the information contained in a barcode. It can recognize one-dimensional or two-dimensional barcodes and convert them into data signals that can be processed by computers. The basic working principle of a barcode scanner is to use a light source to illuminate the barcode, then convert the reflected light signal into an electrical signal through a photoelectric conversion component, and finally interpret it as a digital signal that can be directly accepted by the computer through a decoding circuit.
PDA: PDA (Personal Digital Assistant), that is, a personal digital assistant, is a portable device that integrates mobile computing, data communication, barcode scanning and other functions, similar to a mobile phone. PDA can be used in warehouse management to record and transmit asset information in real time, helping to complete inventory work quickly and accurately. The working principle of the PDA scanner is mainly based on optical recognition technology, which uses a laser diode to emit light to illuminate the barcode and reflect it back into the device to read the barcode information.
A barcode scanner is a graphical analysis input tool, which can be directly equivalent to a keyboard. The keyboard can be wired or wireless. The wireless one is to break through the distance limit, but it still needs to be connected to the host PC, that is, connected to the computer. The connection method may be wired, Bluetooth, or a USB receiver.
For example, at the self-service checkout counter of Sam's Supermarket, there will be a wireless barcode scanner to scan the barcodes of purchased goods. The collected barcode information will be connected to the PC of the checkout counter via Bluetooth, and the barcodes will be input like a keyboard.
For example, in some convenience stores, supermarket platforms, etc., when we are at the checkout, the clerk will use the barcode scanner to scan the goods we purchased and finally calculate the final amount to be paid. After we open the payment code of WeChat or Alipay, the other party will use the barcode scanner to scan our mobile payment code again.
PDA was originally defined as a handheld computer, but with the development and progress of technology, it can now be understood as a special mobile phone (the system may be Android, WinCE, or iOS), and some people call it a "handheld data terminal or handheld terminal". In addition to the basic functions of a mobile phone ,PDA will also add some special modules to the shell, such as a barcode recognition module (scanning head), an RFID recognition module, etc.
For example, SF Express's courier can use a PDA to scan the barcode of the package to complete the signature, or scan the barcode of the shipment to obtain the corresponding shipment information, or scan the user's payment code to complete the collection of freight, etc. These do not need to rely on the PC, but can complete all operations on one device.