先决条件–计算机端口的介绍
1.串口:
串行端口是用于连接串行线路以实现串行通信的接口。这些端口可以对接连接到传输线的9针D型连接器,称为DB-9连接器。通过单线获得的串行通信和仅单个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。
与并行端口的传输速度相比,串行端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,鼠标以及安全摄像机中实现。 DB-9引脚连接器图如下所示。
2.并行端口:
与串行端口不同,并行端口可以同时在八根不同的线上移动一组8位。这就是为什么它比串行通信更快的原因。与串行端口不同,它使用25针连接器,称为DB-25连接器。为了消除串扰和错误,所有位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,由于这个原因,在并行通信中,传输线优选地是短的。
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。
串行端口和并行端口之间的区别:
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. |