Detection device for expanding monitoring quantity by CAN bus

Abstract

A detecting device and method for expanding monitor capacity through a Controller Area Network (CAN) bus are provided. The device includes: a CAN master device and a Field Programmable Gate Array (FPGA) expanding system; within the FPGA expanding system, a CAN IP core receives the data on the CAN bus, sends the data to an information filter, and sends the data returned from an instruction control unit to the CAN master device; when the information filter judges that the data is that received by this FPGA expanding system, the information filter sends the data to the instruction control unit; the instruction control unit executes a corresponding operation according to the data from the information filter and returns the resultant data. The system and method depend on original system less, and can be used as long as there is a CAN bus, thus, the system and method have better expansibility; also fewer hardware resources are used, thus, the maximum flexibility of designs can be realized.

Description

technical field [0001] The invention relates to a monitoring technology, in particular to a detection device and a method for expanding the monitoring quantity through a CAN (Controll Area Network) bus. Background technique [0002] With the development of monitoring technology and the continuous improvement of automation, more and more signals need to be monitored in real time in industrial control, communication, automobile, consumer electronics and other fields and products to achieve the purpose of unattended. [0003] However, due to the continuous increase in monitoring requirements, it is impossible to replace all the original monitoring equipment, which is not allowed in terms of time or cost. Therefore, it is hoped that new monitoring equipment can be expanded on the basis of the original monitoring equipment. The detection system of the monitoring quantity. [0004] At present, there are mainly the following methods for the detection of extended monitoring volume:...

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Problems solved by technology

[0008] Although the above methods can save time and cost to a certain extent while meeting the monitoring requirements, the original system must have a parallel or serial bus and corresponding interfaces through parallel and serial bus expansion. Expansion through the CPU+CAN controller requires the original system and must have a CPU to implement the corresponding expansion. Therefore, expansion through the parallel bus, expansion through the serial bus, and expansion through the CPU+CAN controller are all subject to the requirements of the original system. Constraints, there are limitations in scalability, while using more hardware resources, the flexibility is not strong

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