Access method and system for passive beam splitting RS-485 optical fiber bus

A technology of RS-485 and access method, applied in the field of industrial manufacturing, can solve the problems such as the decrease of communication rate and the inability to guarantee high-speed and long-distance communication requirements, and achieve the effects of compact structure, small size and low cost of multi-channel

Active Publication Date: 2015-07-01
广东启鼎光电科技有限公司
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AI Technical Summary

Problems solved by technology

As the transmission distance increases, the communication rate will drop sharply, which cannot guarantee the high-speed and long-distance communication requirements

Method used

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  • Access method and system for passive beam splitting RS-485 optical fiber bus
  • Access method and system for passive beam splitting RS-485 optical fiber bus
  • Access method and system for passive beam splitting RS-485 optical fiber bus

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Embodiment

[0045] Example: see Figure 1 to Figure 5 , the present embodiment provides a passive optical splitting RS-485 optical fiber bus access method, which includes the following steps:

[0046] (1) Set the RS-485 bus control terminal;

[0047] (2) Set the passive RS-485 optical network local end, and one end of the passive RS-485 optical network local end is connected to the RS-485 bus control end;

[0048] (3) Set a passive RS-485 optical network terminal, and one end of the passive RS-485 optical network terminal is connected to the other end of the passive RS-485 optical network local end;

[0049] (4) User terminal equipment is set, and the user terminal equipment is connected to the other end of the passive RS-485 optical network terminal;

[0050] (5) When working, the RS-485 bus control terminal sends a control signal and transmits it to the passive RS-485 optical network central office through the bus. After the passive RS-485 optical network central office converts the c...

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Abstract

The invention discloses an access method for a passive beam splitting RS-485 optical fiber bus. The method is characterized by including the following steps of firstly, setting an RS-485 bus control side; secondly, setting a passive RS-485 optical network local side; thirdly, setting a passive RS-485 optical network terminal; fourthly, setting a user terminal device; fifthly, sending a control signal through the RS-485 bus control side, converting the control signal into an optical signal through the passive RS-485 optical network local side, transmitting the optical signal to the passive RS-485 optical network side, and converting the optical signal into an RS-485 bus logic signal so as to control the user terminal device; sixthly, making the user terminal device convert a feedback data signal into an optical signal through the RS-485 optical network side, transmitting the optical signal to the passive RS-485 optical network local side through an optical fiber, converting the optical signal into an RS-485 bus level signal or an RS-232 level signal through the passive RS-485 optical network local side, and transmitting the RS-485 bus level signal or the RS-232 level signal to an RS-485 interface or an RS-232 interface of the RS-485 bus control side. The invention further discloses a system for implementing the method.

Description

technical field [0001] The invention relates to the field of industrial manufacturing, in particular to a passive optical splitting RS-485 optical fiber bus access method and a system for implementing the method. Background technique [0002] Smart meters developed with the maturity of single-chip microcomputer technology in the early 1980s, and now the world's meter market is basically monopolized by smart meters. The reason is the need for enterprise informatization. One of the necessary conditions for enterprises to select instruments is to have a network communication interface. Initially, the data analog signal output is simple process quantity, and later the instrument interface is RS-232 interface, which can realize point-to-point communication, but this method cannot realize the networking function. Then came RS-485 to solve this problem. [0003] RS-485 uses differential signal negative logic, -2V~-6V means "0", +2V~+6V means "1". RS-485 has two kinds of wiring, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/25H04B10/278
Inventor 王春
Owner 广东启鼎光电科技有限公司
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