A passive optical splitting rs-485 optical fiber bus access method and system

Abstract

The invention discloses a passive optical splitting RS-485 optical fiber bus access method, which is characterized in that it comprises the following steps: (1) setting the RS-485 bus control terminal; (2) setting the passive RS-485 optical network office (3) set the passive RS-485 optical network terminal; (4) set the user terminal equipment; (5) the RS-485 bus control terminal sends out the control signal, and the passive RS-485 optical network local end converts the control signal into The optical signal is transmitted to the passive RS-485 optical network terminal, and the optical signal is converted into an RS-485 bus logic signal to control the user terminal equipment; (6) The user terminal equipment sends the feedback data signal through the passive RS-485 optical network The terminal converts the optical signal into an optical signal, and then transmits the optical signal to the passive RS‑485 optical network central office through the optical fiber, and the passive RS‑485 optical network central office converts the optical signal into an RS‑485 bus level or RS‑485 232 level signal, transmitted to the RS-485 interface or RS-232 interface of the RS-485 bus control terminal. The invention also discloses a system for implementing the method.

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 access method and a system for implementing the 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, ...

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

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