A passive optical splitting rs-485 optical fiber bus single-port terminal

A technology of RS-485 and optical fiber bus, which is applied in the field of industrial manufacturing, can solve the problems of communication rate drop and cannot guarantee high-speed long-distance communication requirements, and achieve cost saving, improved anti-lightning protection ability, and simple system

Active Publication Date: 2018-03-27
广东启鼎光电科技有限公司
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  • Abstract
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  • 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 optical splitting rs-485 optical fiber bus single-port terminal
  • A passive optical splitting rs-485 optical fiber bus single-port terminal
  • A passive optical splitting rs-485 optical fiber bus single-port terminal

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Embodiment

[0030] Example: see Figure 1 to Figure 7 This embodiment provides a passive optical split RS-485 optical fiber bus single-port 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 split RS-485 optical bus, which include a power module, Photoelectric conversion module, phase conversion circuit, RS-485 driver chip, two high-speed optocoupler circuits, non-polar automatic transceiver commutation circuit and three-level lightning protection circuit, wherein one end of the photoelectric conversion module is connected to one end of the phase conversion circuit. The other end of the conversion circuit is connected to one end of the first high-speed optocoupler circuit and one end of the second high-speed optocoupler circuit. The other end of the first high-speed optocoupler circuit is connected to one end of the non-polarity automatic transceiver commutation circuit and the RS-485 ...

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PUM

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Abstract

The invention discloses a passive optical splitting RS-485 optical fiber bus single-port terminal, which is characterized in that its two ends are respectively connected to a passive RS-485 optical network local end and terminal equipment of the passive optical splitting RS-485 optical fiber bus, which includes Power supply module, photoelectric conversion module, phase conversion circuit, RS-485 driver chip, two high-speed optocoupler circuits, non-polarity automatic transmission and reception commutation circuit and three-level lightning protection circuit, wherein one end of the photoelectric conversion module is connected to the phase conversion circuit One end, the other end of the phase conversion circuit is connected to one end of the first high-speed optocoupler circuit and one end of the second high-speed optocoupler circuit, and the other end of the first high-speed optocoupler circuit is connected to one end of the non-polar automatic transceiver commutation circuit and the RS‑485 driver chip, non-polar The other end of the automatic transceiver circuit is connected to the RS‑485 driver chip, the other end of the second high-speed optocoupler circuit is connected to the RS‑485 driver chip, and the third-level lightning protection circuit is connected to the RS‑485 driver chip.

Description

Technical field [0001] The invention relates to the field of industrial manufacturing, in particular to a passive split-light RS-485 optical fiber bus single-port 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-wire...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/25H04B10/27
Inventor 王春
Owner 广东启鼎光电科技有限公司
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