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Control system based on RS485

A RS485, control system technology, applied in the direction of comprehensive factory control, comprehensive factory control, electrical program control, etc., can solve problems such as the limitation of the number of RS485 interface chips, and achieve the effect of infinite cascading of nodes

Inactive Publication Date: 2012-09-12
重庆星河光电科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a control system based on RS485, which effectively solves the problem in the prior art that the number of RS485 interface chips connected to the RS485 bus is limited

Method used

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  • Control system based on RS485
  • Control system based on RS485
  • Control system based on RS485

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Embodiment Construction

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0020] See figure 1 , figure 1 It is a structural diagram of a 485 communication control system in the prior art, usually each RS485 bus 101 is connected with at least one processing unit, wherein each processing unit includes an RS485 interface chip 102 and an intelligent chip MCU103, each RS485 The interface chips 102 are connected in parallel. Due to the impedance matching problem between the input signal and the output signal of the RS485 interface chip ...

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Abstract

The invention provides a control system based on RS485. The control system comprises an RS485 bus and at least one processing unit, wherein the processing unit comprises an RS485 group; every RS485 group is connected in series through the RS485 bus; each RS485 group comprises a first RS485 interface chip and a second RS485 interface chip; the first RS485 interface chip converts a received differential 485 signal transmitted by the RS485 bus into a direct current signal and outputs to the second RS485 interface chip; and the second RS485 interface chip converts the direct current signal into the differential 485 signal and outputs the signal. The direct current signal is transmitted between the first RS485 interface chip and the second RS485 interface chip, so that the problem about impedance matching between an input signal and an output signal is electrically solved, and node limitless cascading of RS485 is realized.

Description

technical field [0001] The present invention relates to the field of industrial control, more specifically, relates to a control system based on RS485. Background technique [0002] RS485 interface chips have been widely used in many fields such as industrial control, instruments, meters, multimedia networks, and mechatronics products. In the field of RS485 communication control, please refer to figure 1 , usually each RS485 bus is connected with at least one processing unit, wherein each processing unit includes an RS485 interface chip and an intelligent chip MCU, and each RS485 interface chip is connected in parallel. Due to the impedance matching problem between the input signal and the output signal of the RS485 interface chip, the number of RS485 interface chips connected to the RS485 bus is limited and cannot be infinitely cascaded. Theoretically, each RS485 bus supports a maximum of 32 or 256 nodes. The so-called number of nodes is the number of RS485 chips that ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 黄敏
Owner 重庆星河光电科技股份有限公司