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Passive light splitting RS-485 optical fiber bus single-ported terminal

A RS-485, optical fiber bus technology, applied in the field of industrial manufacturing, can solve the problem of not guaranteeing high-speed long-distance communication requirements, communication rate reduction, etc., to achieve the effect of improving anti-lightning protection ability, cost saving, and system simplicity

Active Publication Date: 2015-05-13
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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  • Passive light splitting RS-485 optical fiber bus single-ported terminal
  • Passive light splitting RS-485 optical fiber bus single-ported terminal
  • Passive light splitting RS-485 optical fiber bus single-ported terminal

Examples

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Effect test

Embodiment

[0030] Example: see Figure 1 to Figure 7, the present embodiment provides a passive RS-485 optical fiber bus single-port terminal, the two ends of which are respectively connected to the passive RS-485 optical network local end and terminal equipment of the passive optical splitting RS-485 optical fiber bus, which includes a power module, A photoelectric conversion module, a phase conversion circuit, an RS-485 driver chip, two high-speed optocoupler circuits, a non-polarity automatic transmission and reception commutation circuit and a three-level lightning protection circuit, wherein one end of the photoelectric conversion module is connected to the other end of the phase conversion circuit, and the phase 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 circuit is connected to the RS-485 driver chip, the other end of the second high-speed ...

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Abstract

The invention discloses a passive light splitting RS-485 optical fiber bus single-ported terminal which is characterized in that two ends of the terminal are connected with a passive RS-485 optical network local side of a passive light splitting RS-485 optical fiber bus and a terminal device respectively, the terminal comprises a power module, a photoelectric conversion module, a phase conversion circuit, an RS-485 driving chip, two high-speed optical coupling circuits, a non-polar automatic transmitting and receiving reversing circuit and a three-level lightning protection circuit, one end of the photoelectric conversion module is connected with one end of the phase conversion circuit, the other end of the photoelectric conversion module is connected with one end of the first high-speed optical coupling circuit and one end of the second high-speed optical coupling circuit, the other end of the first high-speed optical coupling circuit is connected with one end of the non-polar automatic transmitting and receiving reversing circuit and the RS-485 driving chip, and the other end of the non-polar automatic transmitting and receiving reversing circuit, the other end of the second high-speed optical coupling circuit and the three-level lightning protection circuit are connected with the RS-485 driving chip.

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 single-port terminal. 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): H04B10/25H04B10/27
Inventor 王春
Owner 广东启鼎光电科技有限公司
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