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Bus relay device

A relay device and bus technology, applied in the bus network, data exchange through path configuration, electrical components, etc., can solve the problems of low reliability, complex structure of two-way relay, complex design of two-way relay, etc., to improve reliability The effects of improving performance, improving driving ability, and simplifying complexity

Inactive Publication Date: 2008-03-19
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

It can be seen from Figure 1 and Figure 2 that the existing two-way relay structure is very complicated
[0004] Since the bus relay must be bidirectional when transmitting HDLC information, but the existing bidirectional relay design is more complicated and less reliable, so a technology is needed to solve the above problems

Method used

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Embodiment Construction

[0021] The specific implementation manners of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Fig. 3 shows a bus relay device according to an embodiment of the present invention. The bus relay device includes: a bidirectional drive unit 302, which is used to receive data on the bus and perform drive regeneration to generate a signal with strong driving capability; a bus state detection unit 304, which is used to sample the bus on both sides of the bidirectional drive unit , and according to the characteristics of the HDLC protocol, judge the state of the bus on both sides, determine the data transmission direction and detect whether there is a conflict; the drive control unit 306 is used to control the bidirectional drive according to the data transmission direction, and the drive direction is set to the direction of data transmission, If the bus is in an idle state, the bidirectional drive is turned off, and the bu...

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Abstract

The invention provides a bus relay device, which includes a two-way drive unit, used to receive data on the bus, perform drive regeneration and generate signals with powerful drive capability; a bus status detection unit, used to perform the bus sampling on both sides of the two-way drive unit, judge the bilateral bus status according to a high level data link control protocol and determine the data transmission direction and detect whether any conflict occurs; a drive control unit, used to control the two-way drive unit according to the data transmission direction and a conflict making unit, used to generate conflict data and send the conflict data to the adjacent bus relay device, after the bus status detection unit detects the conflict. The invention greatly simplifies the complexity of the relay design, improves reliability and effectively improves the bus drive capability.

Description

technical field [0001] The present invention relates to the communication field, and more particularly relates to a 485 bus relay device suitable for HDLC (High-Level Data Link Control, advanced data link control). Background technique [0002] The standard 485 bus can only carry 32 points. When more loads need to be driven, a dedicated chip or relay bus is required. When transmitting HDLC information, bidirectional relay must be carried out. Now two technologies are mainly used to realize two-way relay: 1. Using additional signal lines to control the repeater; 2. Controlling the relay by detecting signals. [0003] Figures 1 and 2 show the structures used by these two technologies, respectively. It can be seen from Fig. 1 and Fig. 2 that the existing two-way relay structure is very complicated. [0004] When transmitting HDLC information, the bus relay must be bi-directional, but the existing bi-directional relay design is relatively complex and has low reliability, so a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/08H04L12/40
Inventor 沙小宁张桢
Owner ZTE CORP
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