485 network : RS485 / MODBUS is now a popular way of industrial networking, which is characterized by the implementation of simple and convenient, and now supports RS485 instruments and particularly large. Now the meter manufacturers have also turned to support RS485 / MODBUS, the reason is very simple, RS485 conversion interface is not only cheap but also a wide range. At least in the low-end market, RS485 / MODBUS will still be the most important industrial networking.

HART Network : HART is an overbuilt bus standard proposed by Emerson. Its main feature is the digital signal superimposed on the 4-20 mA current signal, but the protocol is not really open. To join his foundation, Joining the foundation requires a fee. HART technology is dominated by several large foreign companies, in recent years there are companies doing, but have not yet reached the level of foreign companies. There are many smart meters now with [HART card] that support HART communication. However, from the domestic situation, there is no real use of this part of the function of equipment for network monitoring, up to just use the terminal to set parameters. In the long run, due to the low HART communication rate and networking difficulties, the application of HART meters will show a downward trend.

Fieldbus Fieldbus Network : Fieldbus is one of the hottest technologies in today's automation field and is reputed as a computer LAN in the field of automation. Its appearance marks the beginning of another new era of automation and control technology. Fieldbus is a network of digital, serial, multi-station communications that connects control devices in the control room with instrumentation and control rooms. The key symbol is to support bi-directional, multi-node, bus-based all-digital communications. Fieldbus technology has become a hot spot in the world of automation and instrumentation development in recent years. Its appearance has revolutionized the structure of the traditional control system and made the automatic control system move towards the goal of "intelligent, digitalized, informatized, networked and decentralized The direction of "further" to form a new type of network communications fully distributed control system - Fieldbus Control System FCS (Fieldbus Control System). However, so far, the fieldbus has not yet formed a truly unified standard. Many standards such as ProfiBus, CANbus and CC-Link exist side by side and have their own living space. When unified, in the foreseeable future. At present, there are still a few types of instruments that support field bus, so there is little room for selection. The price is too high and the dosage is also small.

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