What ports are com1 and com2?

com1 and com2 are serial communication ports, referred to as serial ports; a motherboard generally has two com serial interfaces, which are usually used to connect mice or communication devices. The serial interface refers to the data bit by bit. Sequential transmission is characterized by simple communication lines, and only a pair of transmission lines can achieve two-way communication.

The operating environment of this tutorial: Windows 10 system, DELL G3 computer.

What are the ports of com1 and com2?

COM1 and COM2 are both COM ports, which are serial communication ports, referred to as serial ports.

A motherboard generally has two COM serial ports. Usually used to connect mice and communication equipment (such as connecting external MODEM for data communication), etc. The COM port connector on a PC is usually a 9-pin male D-shells interface. The COM pin definition is the same as the RS-232C interface definition (DB9).

Serial interface

Serial interface is referred to as serial port, also known as serial communication interface or serial communication interface (usually referred to as COM interface) , is an extended interface using serial communication. Serial Interface refers to the sequential transmission of data bit by bit. Its characteristic is that the communication line is simple, and only a pair of transmission lines can achieve two-way communication (telephone lines can be directly used as transmission lines), thus greatly reducing costs, and is especially suitable for long-distance communication, but the transmission speed is slow.

Serial Interface (Serial Interface) refers to the sequential transmission of data bit by bit. It is characterized by simple communication lines. As long as a pair of transmission lines are needed, two-way communication can be achieved (telephone lines can be directly used as transmission lines). This greatly reduces the cost and is especially suitable for long-distance communication, but the transmission speed is slow. The communication method in which each bit of data of a message is transmitted bit by bit in sequence is called serial communication. The characteristics of serial communication are: the transmission of data bits is carried out in bit order and can be completed with at least one transmission line; the cost is low but the transmission speed is slow. The distance of serial communication can range from a few meters to several kilometers; according to the direction of information transmission, serial communication can be further divided into three types: simplex, half-duplex and full-duplex.

Ports can be divided into virtual ports and physical ports. Virtual ports refer to ports inside the computer or within the switch router and are invisible.

Hardware port: The CPU transfers data with peripherals through interface registers or specific circuits. These registers or specific circuits are called ports. The ports in the hardware field are also called interfaces, such as parallel ports, serial ports, etc.

Network port: In network technology, port (Port) has several meanings. The ports of hubs, switches, and routers refer to the interfaces connected to other network devices, such as RJ-45 ports, Serial ports, etc. . The port referred to here does not refer to the port in the physical sense, but specifically refers to the port in the TCP/IP protocol, which is the port in the logical sense.

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