The five main types of communication interfaces are: standard serial port (RS232), GPIB interface, Ethernet interface, USB interface, and wireless interface.
The communication interface refers to the interface between the central processor and the standard communication subsystem. Such as: RS232 interface. The RS232 interface is a serial port. The 9-pin socket on the back of the computer case usually has a "|O|O|" mark next to it.
The five main types of communication interfaces
1. Standard serial port (RS232)
The 232 communication line is simple, only one cross It can carry out point-to-point two-way communication with the PC host through the line. Cables are low cost, but have slow transmission speeds and are not suitable for long-distance communications. Consumer PCs have also gradually canceled this interface, and it is currently found in industrial computers and some communication equipment.
After the system and necessary drivers are installed on the industrial computer, its serial port can be used directly. There are also many popular serial port debugging tools on the Internet that can be used to test instruments. Secondary development of communication programs by users is also relatively simple.
2. GPIB
The biggest 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 is often used to send control commands. It is suitable for laboratories or production sites with slight electrical interference. Since ordinary PCs and industrial computers rarely provide GPIB interfaces, you need to purchase a special control card and install the driver before you can communicate with the instrument.
3. Ethernet
At present, most devices are equipped with LAN network interface, commonly known as "crystal head". This feature is flexible networking, The advantages of multi-point communication, unlimited transmission distance, and high speed make it the current mainstream communication method.
The interface itself is mainly used to connect the router to the LAN. However, LAN types are diverse, so this also determines that the router's LAN interface types may also be diverse. Different networks have different interface types. Common Ethernet interfaces mainly include AUI, BNC, and RJ-45 interfaces, as well as FDDI, ATM, and optical fiber interfaces. These networks have corresponding network interfaces. In the instrument industry or system integration industry, most engineers also choose to control instruments by writing commands through the network port.
4. USB
As the most commonly used interface, USB has only 4 wires, two for power and two for signals. The signals are transmitted serially. , so the USB interface is also called a serial port. The output voltage and current of the interface are 5V 500mA. In fact, there is an error, and the maximum cannot exceed /-0.2V, which is 4.8-5.2V.
The four wires of the USB interface are generally allocated as follows: black wire: gnd red wire: vcc green wire: data white wire: data- The main function of USB is to store data in the device or pass the device through The USB interface reads and identifies external information; in addition, USB is also an effective interface for secondary development. Although USB3.0 technology has been very mature in notebook computers and other fields, in the field of instruments, due to the impact of processing speed and architecture, USB2.0 technology is more common.
5. Wireless
In addition to common communication interfaces, wireless connection is also a very important communication method. Its characteristics are: no physical wires The connection and transmission rate are fast, and many instruments and equipment have built-in 802.11 wireless interfaces directly.
You can connect the instrument to a wireless router or connect to the WIFI hotspot of your mobile phone to form a network.
6. Multi-machine synchronization interface
In fact, the multi-machine synchronization interface is different from the common communication interfaces such as USB and LAN mentioned above, but is a power analyzer type device to ensure simultaneous measurement. Get the interface designed with more channels. By connecting two instruments via cables, multiple models can be tested at the same time, ensuring the synchronization of signal testing.
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