Device and method for realizing multiple hosts based on single-master multi-slave protocol

Abstract

The invention provides a device and a method for realizing multiple hosts based on a single-master multi-slave protocol. The device comprises a processor module, at least two host access modules and at least one slave access module. The host access modules and the slave access module are respectively connected with the processor module and are used for realizing the communication between the hostsand the processor module and between slave machines and the processor module. A host interface is expanded on an original single-master 485 network, three RS485 interfaces are provided in total, power supply isolation and signal isolation are adopted for each interface, and a TVS and a resettable fuse are provided. A cache coordination software algorithm is combined, when the two hosts communicate at the same time, the data of a host of another path is cached, when a bus is idle, another path communicates, so that the problem of a communication failure of multiple hosts on a single-master multi-slave protocol is completely solved, the data collision is avoided, memory resources and logic unit resources of a processor are reasonably utilized, and the device has the advantages of reliable communication and high efficiency.

Description

technical field [0001] The invention relates to the field of single-master-multiple-slave communication, in particular to a device and method for realizing multi-master based on a single-master-multiple-slave protocol. Background technique [0002] With the introduction of the concept of the Internet of Things and the implementation of related industries, the Internet of Things industry has ushered in rapid development. Electronic sensors, instruments, equipment, controllers, etc., and electronic terminal equipment all over the world have the need to access the Internet of Things. , and the vast majority of stock terminals do not have redundant interfaces to join the Internet of Things, which makes the last mile of the Internet of Things face a huge challenge. [0003] In the stock market, most of the instruments, controllers, sensors, etc. use the 2-wire 485, and most of the supported protocols are MODBUS protocol and free protocol. The Modbus protocol adopts a simple mast...

AI Technical Summary

Problems solved by technology

However, this method does not fundamentally solve data collisions, and the single-threaded execution mode of polling interruption and master-slave interaction in turn does not make reasonable use of single-chip memory resources and logic unit resources, resulting in low communication efficiency, which urgently needs to be improved.

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