Serial port (Serial port) is a very common interface for communication between devices, and is also widely used for communication between devices and instruments. Common serial ports are RS-232 (using a 25-pin or 9-pin connector) and IPC half-duplex RS-485 and full-duplex RS-422 for applications.
Serial communication uses serial communication, that is, the serial port sends and receives byte sequences bit by bit. Typically, the serial port is used for the transmission of ASCII characters. Serial communication is done using 3 wires: ground, transmit and receive. Serial communication can use the sending line to send data and use the receiving line to receive data at the same time. It is very simple and can realize long-distance communication, and its communication length can reach 1200 meters.
(1) Advantage
, For those devices without serial ports, during their development, the common method is to connect to the computer for development through the serial port, so the serial port is the simplest and easiest way for devices to communicate.
It is also worth mentioning that the cost of serial communication is very low if the cable connecting the serial port is not considered.
(2) Disadvantages
The networking capability of serial communication is poor, although it is usually more stable than wireless,However, in an industrial environment, it is also susceptible to the electromagnetic influence of the environment where the cable is located, resulting in unstable communication and even burnout of the serial port. There is still a big gap between the communication speed of the serial port and Ethernet . Generally speaking, it is only suitable for the communication of low speed and small amount of data.
Chuangling currently produces WiFi module , there are several models with serial interface, such as 8189 series controlled by Realtek RTL8189FTV, and 8723, 8822 series; Silicon Valley's SV6152, SV6256 and other series; HiSilicon's 3881, 3861 series.
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