A kind of passive light-splitting rs-485 optical fiber bus communication method

A technology of RS-485 and optical fiber bus, which is applied in the field of industrial manufacturing, can solve problems such as the inability to guarantee high-speed long-distance communication requirements and the decrease of communication rate, and achieve the effects of improving lightning protection ability, cost saving, and saving optical fiber resources

Active Publication Date: 2018-01-19
广东启鼎光电科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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  • A kind of passive light-splitting rs-485 optical fiber bus communication method
  • A kind of passive light-splitting rs-485 optical fiber bus communication method
  • A kind of passive light-splitting rs-485 optical fiber bus communication method

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Embodiment

[0035] Example: see Figure 1 to Figure 5 , the present embodiment provides a passive optical splitting RS-485 optical fiber bus communication method, which includes the following steps:

[0036] (1) Set the RS-485 industrial optical fiber bus system, which includes the RS-485 bus control terminal connected in sequence, the passive RS-485 optical network local end and the passive RS-485 optical network terminal;

[0037] (2) the user terminal equipment connected with the RS-485 industrial optical fiber bus system described in step (1) is set, and the user terminal equipment is connected with the passive RS-485 optical network terminal;

[0038] (3) When working, the RS-485 bus logic "0" signal is represented by light, and the RS-485 bus logic "1" signal is represented by no light; It cannot send out optical signals exceeding the specified intensity, that is, when sending the RS-485 bus logic "1", it must have a transmission judgment function to prevent the failure of communic...

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Abstract

The invention discloses a passive light-splitting RS-485 optical fiber bus communication method. The RS-485 bus logic "0" signal is represented by light, and the RS-485 bus logic "1" signal is represented by no light; the bus device does not send a signal At this time, the light emitting unit of its own photoelectric conversion module cannot send out an optical signal exceeding the specified intensity, that is, when sending the logic "1" of the RS-485 bus, it must have a launch judgment function to prevent the failure of communication due to bus confusion ; Passive RS‑485 optical network central office, passive RS‑485 optical network terminals and user terminal equipment, only one device is allowed to send signals at each moment, and other devices are in the listening state; data transmission of all user terminal equipment All requests are processed by the RS-485 bus control terminal. All user terminal equipment can transmit data only when they receive their own data transmission instructions sent by the RS-485 bus control terminal, otherwise they are in a silent listening state.

Description

technical field [0001] The invention relates to the field of industrial manufacturing, in particular to a passive light splitting RS-485 optical fiber bus communication 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, two-wire system and four-wire system...

Claims

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Application Information

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