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A passive light-splitting rs-485 optical fiber bus embedded terminal

A RS-485, embedded terminal technology, applied in the field of industrial manufacturing, can solve the problem of not guaranteeing high-speed long-distance communication requirements, communication rate drop, etc., to achieve the effects of wide dynamic range, reduced pulse width distortion, and simple system

Active Publication Date: 2018-08-03
广东启鼎光电科技有限公司
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  • Summary
  • 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 passive light-splitting rs-485 optical fiber bus embedded terminal
  • A passive light-splitting rs-485 optical fiber bus embedded terminal
  • A passive light-splitting rs-485 optical fiber bus embedded terminal

Examples

Experimental program
Comparison scheme
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Embodiment

[0035] Example: see Figure 1 to Figure 8 This embodiment provides a passive RS-485 optical fiber bus embedded terminal, the two ends of which are respectively connected to the passive RS-485 optical network central office and terminal equipment of the passive optical RS-485 optical bus, which include a power module , Photoelectric conversion unit, RS-485 driver chip, high-speed optocoupler isolation circuit, non-polarity automatic transceiver commutation circuit and three-level lightning protection circuit, among which the photoelectric conversion unit is connected to one end of the high-speed optocoupler isolation circuit, and the high-speed optocoupler isolation circuit is another One end is connected to the non-polarity automatic transceiver commutation circuit and the RS-485 driver chip, and the RS-485 driver chip is connected to the three-level lightning protection circuit; the photoelectric conversion unit includes a transmitting unit and a receiving unit; the transmittin...

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Abstract

The invention discloses a passive optical splitting RS‑485 optical fiber bus embedded terminal, which is characterized in that its two ends are respectively connected to a passive RS‑485 optical network local end and user terminal equipment of the passive optical splitting RS‑485 optical fiber bus, It includes a power module, a photoelectric conversion unit, an RS‑485 driver chip, a high-speed optocoupler isolation circuit, a non-polarity automatic transceiver circuit and a three-level lightning protection circuit. Among them, the photoelectric conversion unit is connected to one end of the high-speed optocoupler The other end of the coupling isolation circuit is connected to the non-polarity automatic transceiver reversing circuit and the RS-485 driver chip, and the RS-485 driver chip is connected to a three-level lightning protection circuit; the photoelectric conversion unit includes a transmitting unit and a receiving unit; the transmitting unit includes a laser driver and Laser; the receiving unit includes a photodiode and an amplification and comparison circuit.

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 embedded terminal. Background technique [0002] Smart meters were developed with the maturity of single-chip technology in the early 1980s. Now the world meter market is basically monopolized by smart meters. The reason is the need of enterprise informatization. One of the necessary conditions for the enterprise to choose the instrument is to have a networked communication interface. In the beginning, it was a simple process quantity of data analog signal output. Later, the instrument interface was an RS-232 interface. This interface can realize point-to-point communication, but this method cannot realize the networking function. The subsequent RS-485 solves this problem. [0003] RS-485 adopts differential signal negative logic, -2V~-6V means "0", +2V~+6V means "1". RS-485 has two-wire and four-wire connections. The four-w...

Claims

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Application Information

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