Serial communication is a data transmission method in binary bit(bit)units.Only one bit is transmitted at a time.Except for the ground wire,only one data line is required in one data transmission direction.This line is both a data line.It is also used as a communication link control line,and data and contact signals are transmitted bit by bit on this line.Serial communication requires less signal lines,at least two or three lines,and is suitable for long distance occasions.Both computers and PLCs are equipped with common serial communication interfaces,and serial communication is generally used in industrial control.Serial communication is mostly used for data communication between PLC and computer and between multiple PLCs.
串行通信是以二进制的位(bit)为单位的数据传输方式,每次只传送一位,除了地线外,在一个数据传输方向上只需要一根数据线,这根线既作为数据线又作为通信联络控制线,数据和联络信号在这根线上按位进行传送。串行通信需要的信号线少,最少的只需要两三根线,适用于距离较远的场合。计算机和PLC都备有通用的串行通信接口,工业控制中一般使用串行通信。串行通信多用于PLC与计算机之间、多台PLC之间的数据通信。
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