The connection method of the UHF RFID Reader with computer as bellow: Serial RS232, RS485, Wiegand 26/34/42, RJ 45, WIFI, etc.

Currently on the market popular UHF reader often provide a serial communication connection, and the serial port is the most most of the hardware and computer communication of the most important method. So let us first look at what is the serial port?

Serial port is the serial communication interface (Serial Interface) referred to, also known as COM port. It is characterized by simple communication lines, as long as a pair of transmission lines can achieve two-way communication, and can use telephone lines, which greatly reduces the cost, especially for long-distance communications, but the transmission speed is slow. The information of each bit of information is transmitted in order by serial communication. Serial communication is characterized by: data bit transmission, transmission by bit order, at least one transmission line can be completed; low cost but the transmission speed is slow. Serial communication distance can be from a few meters to a few kilometers; according to the direction of information transmission. Serial communication can be further divided into simplex, half duplex and full duplex three.

The initial stage of the serial port is to achieve the purpose of connecting the computer peripherals, the initial serial port is generally used to connect the mouse and external Modem and old camera and WordPad and other equipment. The serial port can also be used due to the interconnection and data transmission between two computers (or devices). As the serial port (COM) does not support hot-swappable and low transmission rate of the current part of the new motherboard and most of the portable computer has begun to cancel the interface, the current serial port for industrial control and measurement equipment and some communications equipment. Serial interface in accordance with electrical standards and protocols can be divided into RS-232, RS-422, RS485 and so on. Which RS-232 also known as the standard serial port, is the most commonly used a serial communication interface, it takes unbalanced transmission, the so-called single-ended communication. The maximum transmission distance of about 15 meters, the maximum rate of 20kb / s. RS-232 is designed for point-to-point (ie, only a pair of incoming and outgoing devices), with a driver load of 3 to 7kΩ. So RS-232 for local communication between the equipment, in the later described the reader device connection is also a 9-pin standard RS232 interface based. RS232 serial data cable 9-pin interface pin is defined as follows:

Shenzhen Jietong technology UHF reader support serial communication, and provide SDK and DEMO source, very convenient for customers to develop the second time.