It refers to the change in unit time after the signal is modulated, that is, the number of times the carrier parameter changes per unit time, for example, 240 characters are transmitted per second, and each character format contains 10 bits (1 start bit, 1 Stop bit, 8 data bits), the baud rate at this time is 240Bd, and the bit rate is 10 bits * 240 bits/second = 2400bps. For two ports communicating, these parameters must match.Ī, Baud rate: This is a parameter that measures the transmission rate of symbols. The most important parameters of serial communication are baud rate, data bits, stop bits and parity. Other lines are used for handshake, but are not required. Because serial communication is asynchronous, the port can send data on one wire while receiving data on the other. Communication is done using 3 wires, which are ground, send, and receive.
Typically, serial ports are used for the transmission of ASCII characters. For example, when IEEE488 defines the parallel communication state, it is stipulated that the total length of the device line shall not exceed 20 meters, and the length between any two devices shall not exceed 2 meters for serial ports, the length can be up to 1200 meters. It is simple and enables long-distance communication. The concept of serial communication (SerialCommuniicaTIons) is very simple, the serial port sends and receives bytes by bit (bit).Īlthough slower than byte-by-byte parallel communication, serial ports can use one wire to send data at the same time as another wire to receive data. The principle of serial communication and USB to serial communication
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