串口与并口的区别

先决条件——计算机中的端口介绍
1. 串口：
串口是用于连接串行线以实现串行通信的接口。这些端口可以对接一个连接传输线的9针D形连接器，称为DB-9连接器。通过单线获得的串行通信，只有单一的数据流从一端传输到另一端。因此，与并行传输一样，在串行传输中数据速度不匹配不是问题。电线的长度可以根据需要增加。

与并口传输速度相比，串口的传输速度相对较低。串行端口通常在调制解调器、连接设备、控制器、鼠标以及安全摄像头中实现。 DB-9 针连接器示意图如下。

2. 并口：
与串行端口不同，并行端口可以在 8 条不同的线上一次移动一组 8 位。这就是为什么它比串行通信更快的原因。与串口不同，它使用一个 25 针连接器，称为 DB-25 连接器。为了消除串扰和错误，所有比特流都需要在并行通信中以相同的速度传输数据。但是，这是不切实际的。因此，出于这个原因，在并行通信中，传输线最好是短的。

并行端口通常在 zip 驱动器、打印机、硬盘驱动器、CD-ROM 驱动器等中实现。DB-25 引脚连接器图如下所示。

串口与并口的区别：

S.NO	Serial Port	Parallel Port
1.	Serial port is used to achieve serial transmission.	While parallel port is used to achieve parallel transmission.
2.	The transmission speed of serial port is comparatively low as compared to parallel port transmission speed.	While transmission speed of parallel port is higher than serial port transmission speed.
3.	In serial port communication less number of wires are used.	While in parallel port communication more number of wires are used as compared to serial port.
4.	A serial port is capable of delivering the single stream of data.	While a parallel port is capable of delivering multiple streams of data.
5.	Serial port send a bit after another bite at a time.	While parallel ports send multiple bits at once.
6.	In a serial port, male ports are involved.	While in a parallel port, female ports are involved.
7.	Serial ports are typically implemented in modems, connecting devices, security cameras and controllers.	Parallel ports are typically implemented in zip-drives, printers, hard drives, CD-ROM drives, etc.