RS232 port is a classic serial communication interface set by the electronic industry association（EIA）, which is also one of the most widely used physical layer communication standards in industrial control and data communication. As the first standardized serial communication protocol, it has been verified by several decades of technical iteration, and is still a basic interface solution for low-speed and reliable interaction between equipment via RS232 communication port. Although high-speed Ethernet has become the mainstream of the current network transmission, the RS232 serial port has always been an irreplaceable choice in local operations and the underlying industrial equipment access.
1.RS232 Port: what is the use of rs232 port？
From the technical to analyze, the rs232 serial port adopts the single-end signal transmission mechanism, supports the all-duplex data interaction, the circuit logic is simple, the supporting device is low cost, so it is always widely used. The reliable transmission distance is about 15 meters, it is enough for the low bandwidth scene of control instruction, equipment status acquisition, configuration parameter interaction and other low bandwidth scene, the transmission delay is controlled, and the anti-interference performance of the short distance scene can fully satisfy the basic communication requirements when users need how to check rs232 port is working for daily equipment debugging.
2. RS232 Port physical interface form
In the form of physical interface, in addition to the traditional DB9 needle serial rs232 port interface, it also have the RJ45 interface, USB rs232c port interface. DB9 interface is a classic interface form in the industrial field, which is more common in the traditional industrial instrument and early industrial equipment. The RJ45 interface is equipped with the universal wiring system of the network equipment, which makes it easier for the on-site operator to use the regular network line to complete the connection. The USB type is appropriate for the interface configuration of the modern operation and maintenance terminal, which can be connected to the computer without additional transfer. The interface of different forms has the appropriate scene, which can meet the different equipment.
3.How do you apply the RS232 interface in the application scenario?
The most core application of the RS232 in network communication products is the local debug interface as the console, which is a fully independent and out-of-run management channel for the business data plane. The core value of this design is Its maintenance channel is completely decoupled from the service network, not taking up business bandwidth, and not affected by the problem of network configuration error, port loop and business link interrupt. Even if the network management channel such as the network parameter is completely failed, the operator can still connect the terminal through the interface, enter the interface to complete the device initialization configuration, the system firmware upgrade, the running log reading, the fault location check, the factory configuration reset, etc.. In the design system of industrial network equipment, the console port is an important indicator of the reliability of the equipment, especially in the outdoor, remote unattended sites, and the equipment can be used to complete the emergency disposal through the local serial port, avoiding the uncontrollable equipment. In the industrial automation scene, many traditional on-site equipment, such as the PLCC, industrial instrument, sensor and card reader, are limited to the development cycle and the service life, which only has the ability of serial port output, which cannot be directly connected to the Ethernet architecture. This type of industrial terminal is often used in the long period of service period, and the operation state is stable, the long period of implementation, and the risk of production continuously. At this time, the RS232 can be used as the physical entry of the data collection, the switch equipment with the independent serial port server or the integrated serial port service function, and the network connection of the traditional serial port equipment is realized by means of the protocol transformation to transfer the serial port data transparent to Ethernet, and the traditional serial port equipment is implemented without modifying the terminal hardware and not modifying the original communication logic.
This kind of access scheme supports various working patterns such as TCP server/clientage and virtual serial port, and can be flexible to match the access architecture of different industrial systems: whether it is the collection structure of the direct connection of the point, the acquisition structure of multi-point polling, or the existing top machine software through the virtual serial port, all can provide the corresponding technical implementation path, and greatly reduce the technical threshold and the risk of the system transformation. At present, the scheme has been widely used in intelligent manufacturing, intelligent water, electric power monitoring, rail transportation, environmental monitoring and so on, and it is a cost-effective method for the cost of transformation and industrial digital transformation.
4.Summary
The built-in RS-232 serial port of Rayin Technology industrial Ethernet switches, depends on the ability of full self-develped software, also can be developed flexibly according to the actual application scene of different industries. In addition to the local maintenance of the normal console port, it can also be customized for the exclusive function of serial port, protocol conversion, and the diversified equipment access requirements of the industrial site. If you need a complete product plan and technical white paper for Rayin Technology industrial switches, welcome to the website: www.szrayin.com.
