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Communication converter supporting recommended standard (RS) 485 and Modbus multi-master station data acquisition

A rs485&modbus, communication converter technology, applied in the field of industrial field bus communication, can solve the problem of inability to guarantee the originality and authenticity of data, and achieve the effect of flexible use, prevention of human tampering, and strong real-time performance

Active Publication Date: 2013-02-13
南京富岛信息工程有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this method cannot prevent the data from being tampered with in the middle, and cannot guarantee the originality and authenticity of the data. It is difficult to apply in occasions that require high data originality and authenticity (such as customs supervision).

Method used

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  • Communication converter supporting recommended standard (RS) 485 and Modbus multi-master station data acquisition
  • Communication converter supporting recommended standard (RS) 485 and Modbus multi-master station data acquisition
  • Communication converter supporting recommended standard (RS) 485 and Modbus multi-master station data acquisition

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Embodiment Construction

[0038] In the following, the present invention will be described in detail in combination with specific examples and accompanying drawings. In this embodiment, ARM microprocessor adopts AT91RM9200, SDRAM adopts K4S561632C, and NORFLASH adopts 28F128J3A.

[0039] Such as figure 1 , 2As shown, a communication converter supporting RS485&Modbus multi-master data acquisition, which includes: ARM microprocessor, power supply / reset circuit, backup link, UI circuit, SDRAM, NORFLASH, first RS485&Modbus interface, second RS485&Modbus interface and the third RS485&Modbus interface, the signal output end of the power supply / reset circuit is connected with the signal input end of the ARM microprocessor, the signal output end of the ARM microprocessor is connected with the signal input end of the backup link, and the ARM microprocessor It is also connected with UI circuit, SDRAM, NORFLASH, the first RS485&Modbus interface, the second RS485&Modbus interface and the third RS485&Modbus interf...

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Abstract

The invention discloses a communication converter supporting recommended standard (RS) 485 and Modbus multi-master station data acquisition. The communication converter comprises an advanced reduced instruction set computer (RISC) machine (ARM) microprocessor, a power / reset circuit, a standby link, a user interface (UI) circuit, a synchronous dynamic random access memory (SDRAM), a NOR Flash, a first RS485 and Modbus interface, a second RS485 and Modbus interface and a third RS485 and Modbus interface, wherein the signal output end of the power / reset circuit is connected with the signal input end of the ARM microprocessor; the signal output end of the ARM microprocessor is connected with the signal input end of the standby link; and the ARM microprocessor is also connected with the UI circuit, the SDRAM, the NOR Flash, the first RS485 and Modbus interface, the second RS485 and Modbus interface and the third RS485 and Modbus interface. The communication converter has the advantages that by using the ARM microprocessor as a core and using a peripheral hardware interface circuit, two pieces of master station equipment can simultaneously acquire data on an RS485 and Modbus bus, so the data which are acquired by each master station are original and real.

Description

technical field [0001] The invention relates to the technical field of industrial field bus communication, and realizes a communication converter supporting RS485&Modbus multi-master station data collection. Background technique [0002] The Modbus serial protocol was originally proposed by Modicon in 1979. It is the world's first real bus protocol used in industrial fields, and it is now one of the most popular general industrial standard protocols in the world in the industrial field. [0003] Modbus serial communication uses master-slave technology, that is, only one master station and multiple slave stations are allowed to perform digital communication on one RS485&Modbus bus. This master-slave communication protocol of Modbus determines that only one master station can exist at any time. The master station collects data. [0004] In industrial production process control or data acquisition systems, such as different DCS systems, PLC systems, etc., there are many cases...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40
Inventor 张良朝陈夕松璩泽刚王家渠张乐
Owner 南京富岛信息工程有限公司
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