LonWorks network technology is one of the important standards in the international and domestic construction equipment industry. Especially in the field of central air-conditioning, it is recognized as the most outstanding fieldbus technology with high reliability, high stability, good interoperability, and convenient construction and maintenance. International brands such as Mitsubishi Electric, Daikin, Trane, Mitsubishi Heavy Industries, Hitachi and other VRV central air-conditioning equipment use LonWorks communication interface as the standard remote communication interface, communication protocol is LonTalk, can easily access the building automation system and smart home control system. Simultaneously. In these fields, a large number of third-party RS232, RS485 and other common ModBus RTUs or other custom serial communication protocol smart meters and devices need to be integrated into the LonWorks network. On other occasions, how to implement interoperability between different types of fieldbuses such as KNX/EIB, CANBus, BACnet, and LonWorks is extremely important. The LonWorks intelligent gateway introduced in this paper is the key equipment that realizes the conversion of various types of communication protocols and LonTalk protocols. It plays a key role in the integration of building automation systems and smart home systems.
LonWorks Smart Gateway, also known as LonWorks protocol converter, is an innovative application of LonWorks network technology. Gateway (also known as gateway), protocol converter. The gateway is to realize the interconnection of the network on the transport layer, it is the most complicated network interconnection device, only used for the interconnection of two different high-level protocols. The structure of the gateway is similar to that of a router. The difference is the interconnection layer. A gateway is a computer network system device that acts as a transforming task. The gateway is a translator between two systems that use different communication protocols, data formats or languages, or even architectures that are completely different. Unlike bridges, which simply communicate information, gateways repackage incoming messages to suit the needs of the destination system.
In actual engineering applications, a large number of third-party instruments and devices do not use the LonTalk protocol. Instead, they use more common instruments and devices such as RS232 and RS485 serial communication modes. How to achieve data collection and intelligence for these devices? The control of the LonWorks network system platform is very important. On other occasions, based on the LonWorks network technology design how to realize the integration of VRV central air-conditioning equipment with Ethernet, RS485 bus, KNX/EIB bus, BACNet bus and other field bus, which gave birth to a variety of field bus communication protocols and The birth of the intelligent gateway that the LonTalk agreement exchanges each other, this is the LonWorks gateway series products.
I. LonWorks Gateway Functions and Features
The following uses HiSilicon iGate series LonWorks intelligent gateway products to introduce their functional characteristics and application of technical parameters.
1. Based on the internationally advanced LonWorks control network technology, the network is flexible, easy to expand, and has good interoperability;
2.1 or more serial communication interface, using optically isolated RS232 interface, RS485 interface, etc., can improve the system's anti-jamming capability and reliability;
3. LonWorks wireless gateways should provide support for multiple wireless communication modes such as 433M and ZigBee;
4. The Neuron 3150 chip's smart node supports 64 network variants, and the new generation Neuron FT5000 chip supports up to 254 standard network variables. There is a big gap between the load capacity of these two kinds of neuron chips and attention should be paid when selecting the LonWorks gateway.
5. Access MODBUS RTU, KNX/EIB, CANBus, BACnet, Ethernet and other devices through LonWorks;
6. Access LonWorks devices through MODBUS RTU, KNX/EIB, CANBus, BACnet, and Ethernet devices;
7. Hass iGate211 multi-protocol LonWorks intelligent network server is HiSilicon's latest intelligent gateway product, which can simultaneously realize the conversion of protocols such as LonTalk, TCP/IP, ModBus RTU, CAN, etc., 3-way RS232/485 serial port, master station, slave The station can be freely defined and has WEB access control function, which can independently build intelligent monitoring system; support APP application development;
8. Using a variety of anti-jamming technology (multilayer circuit board, power supply and communication double isolation, redundant design, etc.), can work stably and reliably in a strong electromagnetic interference environment;
In Hass iGate series LonWorks intelligent gateway products, iGate211 type, iGate105, iGate102 and other three models are the most commonly used, in which iGate211 LonWorks network server has LonTalk protocol (Note: LonWorks bus communication protocol), ModBus RTU protocol ( Up to three RS232, RS485 bus interface), ModBus TCP (or TCP/IP), CAN protocol and other communication protocols can convert each other at the same time. The built-in web control system program greatly facilitates the control system for multiple intelligent terminal devices. (such as VRV air conditioning, electricity meter, water meter, home theater, lighting control system, curtain control system, etc.) system integration, at the same time, users can remotely monitor the home control system through the network at any time, any place, is the core equipment of the home control system.
Second, LonWorks gateway in the VRV air-conditioning system control system composition
In the domestic smart home industry, numerous control system integrators are still using the control system based on RS485 bus technology because 485 bus technology is easy to master; a large number of third-party equipment are all based on the low-cost products of the 485 bus technology, and thus the construction cost. Low; At the same time, there are many 485 bus talents. In addition, in some high-end smart home control systems, applications such as CAN bus and KNX/EIB bus have been increasingly praised by users. In all these home control systems, the integration of high-end equipment only requires the purchase of corresponding fieldbus intelligent gateways. Therefore, Mitsubishi Electric, Daikin, Trane, Mitsubishi Heavy Industries, Hitachi and other major imported brands integrate VRV air conditioner into the home. The control system is very convenient.
The following figure shows the typical network structure of the VRV air conditioner integrated into the home control system:
End Launch Adapter,Coax Connector Adapter,Wr28 Waveguide Adapter,End Launch Coaxial Adapter
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