Multi-host communication system

Abstract

This invention discloses a micro controller with bus and intercommunicated nodes for multi-host communication system, which contains data transmission unit, receiving unit, asynchronous series communication interface, bus monitor check unit, priority mark transmission unit, bus priority arbitration unit, priority mark filter unit, data/address identifying unit, wherein the asynchronous series communication interface connected with a multi-host interface whose another end connected with said bus. Said invention not only realizes point-to-point multi-host communication among plurality of equipment but also does not increase the occupation to software and hardware resource of MCU, and reduces cost and raises efficiency.

Description

technical field [0001] The invention relates to a multi-master communication system in which each node can actively initiate a communication request in a cluster network equipment system. Background technique [0002] With the application and development of network technology and automatic control technology, the control system is becoming more and more complex, and the application of various control systems has gradually developed from a single machine to a multi-machine network, such as data acquisition, fire protection, access control, consumption and other measurement and Control system, which requires the formation of a network between various measurement and control devices or between each device and a computer to communicate with each other. [0003] At present, to realize data communication between multiple control devices, the existing technology mainly adopts two methods: one is a master-slave communication system composed of RS-485 and other communication methods,...

AI Technical Summary

Problems solved by technology

Although this communication network simplifies the burden on the MCU of the device and the design complexity of the user, it also has some disadvantages:

[0006] (1) The special protocol explains that the chip price is relatively high (often exceeding the price of the MCU of many devices), and it is impossible to consider this communication method for many products with strict cost control (such as a large number of various industrial and civilian products). , only other communication methods can be selected;

[0007] (2) Dedicated protocol interpretation The interface between the chip and the MCU of the device is generally a parallel bus interface, but many devices now use a single-chip operation mode (that is, the MCU in the device itself has certain peripheral functions, There is no need for bus expansion), so the use of this communication method will lead to the complexity of the internal hardware circuit of the device, and will also increase the size of the device (because the bus expansion circuit of the MCU and the dedicated protocol interpretation chip must be added)

[0008] (3) Various field buses have their own different network protocols and software and hardware requirements, and are incompatible with each other. The special agreement explains that the chip manufacturers are all foreign manufacturers, and some manufacturers even require users to sign some kind of agreement with them before supplying them to users. Protocol interpretation chips, so when users invest a lot of energy and money to develop these bus products, they are easily controlled by protocol chip manufacturers, and it is almost impossible to have other choices;

[0009] (4) Since the bus communication protocol has been fixed (after the bus type is selected, the bus communication protocol is fixed), it is not necessarily suitable for the user's application needs;

[0010] In short, the two methods of multi-point communication that are widely used now either cannot meet the requirements of multi-master communication, or have disadvantages such as high hardware cost, inability to reduce the volume, and complicated circuits.

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