Shulou(Shulou.com)06/02 Report--

This article will explain in detail what the types of communication interfaces are, and the content of the article is of high quality, so the editor will share it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

There are five main types of communication interfaces: standard serial port (RS232), GPIB interface, Ethernet interface, USB interface and wireless interface.

Communication interface (communication interface) refers to the interface between the CPU and the standard communication subsystem. For example: RS232 interface. The RS232 interface is the serial port. The 9-core socket at the back of the computer chassis is usually marked with "| O | O |".

Five main types of communication interfaces

1. Standard serial port (RS232)

The communication line is simple, as long as a cross line can carry out point-to-point two-way communication with PC host. The cost of cable is low, but the transmission speed is slow, so it is not suitable for long-distance communication. Consumer PCs also gradually cancel the interface, which mostly exists in industrial computers and some communication equipment.

After the industrial control computer has installed the system and the necessary drivers, its serial port can be used directly, and there are many popular serial port debugging tools on the Internet that can be used to test instruments. It is also relatively simple for users to re-develop communication programs.

2 、 GPIB

The most important feature of GPIB is that it can connect several instruments with one bus to form an automatic test system. The communication rate is low, and it is often used to send control commands, which is suitable for laboratories or production sites with slight electrical interference. As ordinary PCs and industrial computers seldom provide GPIB interfaces, it is necessary to purchase special control cards and install drivers before they can communicate with the instrument.

3. Ethernet

At present, most devices are equipped with LAN network interface, commonly known as "crystal head", which has the advantages of flexible networking, multipoint communication, unlimited transmission distance, high speed and so on, which makes it the mainstream mode of communication at present.

The function of the interface itself is mainly for the router to connect with the local area network. However, there are a variety of LAN types, so this determines that the LAN interface types of routers may also be diverse. Different networks have different interface types. The common Ethernet interfaces are AUI, BNC and RJ-45 interfaces, as well as FDDI, ATM and optical fiber interfaces. These networks all have corresponding network interfaces. In the instrument industry or system integration industry, most engineers will also choose to write commands through the network port to control the instrument.

4 、 USB

As the most commonly used interface, USB has only four wires, two power supplies and two signals, and the signal is transmitted serially, so the USB interface is also called serial port. The output voltage and current of the interface is + 5V 500mA actually has an error, the maximum can not exceed + /-0.2V, that is, 4.8V-5.2V.

The four wires of the USB interface are generally assigned as follows: black line: gnd red line: vcc green line: data+ white line: the main function of data- USB is to store the data in the device or for the device to read and identify external information through the USB interface; in addition, USB is also an effective interface for secondary development. Although the technology of USB3.0 has been very mature in the field of notebook computers, but in the field of instruments, affected by the processing speed and architecture, the most common is the technology of USB2.0.

5. Wireless

In addition to the common communication interface, wireless connection is also a very important way of communication, its characteristics are: no physical line connection, fast transmission rate, there are many instruments and equipment directly built-in 802.11 wireless interface.

The instrument can be connected to the wireless route, or connected to the WIFI hotspot of the mobile phone to form a network.

6. Multi-computer synchronization interface

In fact, the multi-computer synchronization interface is different from the common communication interfaces such as USB and LAN mentioned above, but the interface designed by the equipment of power analyzer to ensure that the number of channels can be measured simultaneously. Multi-channel models can be tested at the same time by connecting two instruments through cables, which ensures the synchronization of signal testing.

About the types of communication interfaces which are shared here, I hope that the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.