Method of forwarding simple ring structure serial port modem signal

Abstract

The invention discloses a one-loop structure serial port modem signal forwarding method. The method comprises the following steps that: a: a master device receives data from a serial port and then sends the data to a connected slave device through an optical port; b: the slave device receives the data and then forwards the data to a slave device serial port and at the same time forwards the data to the connected slave port at the next lower level through the optical port; the forwarding is cycled till the last slave device; c: the last slave device receives the data from the optical port of the device at the last higher level, forwards the data to the serial port and at the same time transmits the data to a master device through an optical device. By adopting a one-loop structure made of the serial port optical fiber modem, the invention has the following advantages that: 1) the circuit implementation is simple and the cost is low; 2) the RS-232 interface and RS-485 interface are provided at the same time; 3) the complex programmable logic device (CPLD) is adopted to realize the main structure design, which ensures high reliability; 4) the serial port speed can be as high as 1 M.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a signal forwarding method of a single-ring structure serial port modem. Background technique [0002] In recent years, optical fiber communication and optical fiber communication network have been developed rapidly. Whether in post and telecommunications, railways, military, oil, public security and other fields, or in television broadcasting, banks, schools and other occasions, more and more optical fiber communication and optical fiber communication networks are used. [0003] At present, modem devices are mostly used for conversion from serial port to optical fiber, but they all use point-to-point communication, which is very inconvenient to use in point-to-multipoint applications. Although there are optical fiber devices in the loop, most of them adopt double-ring structure, which is complicated in design and high in cost. Contents of the invention [0004] The tech...

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Problems solved by technology

[0003] At present, most of the conversions from serial ports to optical fibers use modem devices, but they all use point-to-point communication, which is very inconvenient to use in point-to-multipoint applications. Although there are optical fiber devices in the loop, most of them adopt double-ring structure, which is complicated in design and high in cost.

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