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Communicating method being based on Internet of Things electric temperature measurement equipment and enabling RS485 bus and CAN bus to be compatible

A technology of RS485 and CAN bus, which is applied in the direction of bus network, electrical components, data exchange through path configuration, etc., can solve the problem of low penetration rate of CAN bus, achieve good compatibility, avoid time waste, and reduce system complexity Effect

Active Publication Date: 2014-01-29
TIANJIN 712 COMM & BROADCASTING CO LTD +1
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Problems solved by technology

However, in the field of Internet of Things, the penetration rate of CAN bus is not high

Method used

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Embodiment Construction

[0039] In order to understand the present invention more clearly, describe the present invention in detail in conjunction with embodiment:

[0040] 1), define the network master and slave:

[0041] Both RS485 and CAN bus belong to half-duplex communication, both of which belong to bus network physically and star network logically. In the Internet of Things power temperature measurement equipment (WL-002), it includes the control terminal of the host computer and a number of card readers connected to the host computer through the serial bus network. Therefore, the host computer control terminal in the designated network is the master device, and all card readers are slave devices. The master device is responsible for the allocation of bus resources, and the slave device stores a 1-byte unsigned variable cMask with an initial value of 0, which is used to record the current bus type. When the master device sends data to the bus, the slave device sets different flag bits ...

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Abstract

Provided is a communicating method being based on Internet of Things electric temperature measurement equipment and enabling an RS485 bus and a CAN bus to be compatible. A method for stipulating unified master-slave equipment rules, network address assignment rules, frame formats, data package formats, bus resource allocation rules and reserved word rules consistent for the RS485 bus and the CAN bus is adopted. Firstly, network master equipment and network slave equipment are defined, then network addresses, the frame formats, the data package formats, bus resource allocation and reserved words are defined, one node in an RS485 and CAN bus network is assigned to be the master equipment, and all other nodes are used as the salve equipment. The master equipment is used for bus resource allocation. A variable is stored in the slave equipment, and used for recording the types of the current buses. The two buses are made to be in communication with the unified method. The method is good in compatibility of the RS485 bus and the CAN bus, meanwhile, the type of hardware equipment does not to be concerned in an application layer, wasted time due to the fact that two sets of software are developed for the same equipment can be avoided, meanwhile, system complexity can be lowered, the probability of mistakes can be reduced, and cost of development and maintenance links can be saved.

Description

technical field [0001] The present invention relates to a communication method based on the power temperature measuring equipment of the Internet of Things, in particular to a communication method based on the power temperature measuring equipment of the Internet of Things that can be compatible with the communication of RS485 and CAN bus at the same time. The present invention can be extended and applied to the Internet of Things, industrial control and other The equipment in the field uses RS485 to communicate with the CAN bus. Background technique [0002] With the in-depth development of the Internet of Things technology, item management and equipment operation monitoring have become important front-end technologies of the Internet of Things. The use of SAW-RFID to realize constant monitoring of equipment operation can enable the power operation department to predict failures and solve problems in advance, avoiding huge economic losses and casualties caused by failur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40H04L1/22H04L29/12
Inventor 李鸿儒吴昊王飞
Owner TIANJIN 712 COMM & BROADCASTING CO LTD
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