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Communication method for passive beam splitting RS-485 optical fiber bus

A technology of RS-485 and optical fiber bus, which is applied in the field of industrial manufacturing, can solve the 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 solving damage hazards

Active Publication Date: 2015-07-01
广东启鼎光电科技有限公司
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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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  • Communication method for passive beam splitting RS-485 optical fiber bus
  • Communication method for passive beam splitting RS-485 optical fiber bus
  • Communication method for passive beam splitting RS-485 optical fiber bus

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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 communication method for a passive beam splitting RS-485 optical fiber bus. A logic signal 0 of the RS-485 bus is represented when light exists, and a logic signal 1 of the RS-485 bus is represented when light does not exist. When a bus device does not send a signal, none of light emission units of photovoltaic conversion modules of the bus device can transmit an optical signal exceeding the specific intensity; in other words, when the logic 1 of the RS-485 bus is sent, the transmission judgment function is needed, and the fault that communication can not be conducted when bus chaos happens is prevented. In passive RS-485 optical network local sides, passive RS-485 optical network terminals and user terminal devices, only one device is allowed to send a signal at each moment, and the rest of the devices are in the interception state; data sending requests of all the user terminal devices are processed through the RS-485 bus control sides, all the user terminal devices can not transmit data until receiving data sending instructions which are sent by the RS-485 bus control sides and belong to the user terminal devices, otherwise the user terminal devices are in the silent interception 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 Applications(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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