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Communication slave, bus cascading method and system

A line-level and cascading technology, applied in the field of bus cascading methods and systems, and communication slaves, can solve the problems of low reliability and complex hardware of communication expansion units, and achieve the effect of high reliability.

Inactive Publication Date: 2009-12-23
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The "communication extension unit" has complex hardware and low reliability, and requires complex bus management algorithms to realize the logical address registration of communication slaves

Method used

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  • Communication slave, bus cascading method and system
  • Communication slave, bus cascading method and system
  • Communication slave, bus cascading method and system

Examples

Experimental program
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Effect test

Embodiment Construction

[0045] see figure 2 , is a schematic structural diagram of the first embodiment of the bus cascading system provided by the embodiment of the present invention.

[0046] The bus cascading system includes a communication master 100 and a communication slave.

[0047] figure 2 As shown, the bus cascading system provided by the embodiment of the present invention includes:

[0048] Communication master 100, for connecting communication slaves, such as figure 2 As shown, the communication slave 1, the communication slave 2, ... the communication slave n are connected to the communication master 100 through the bus.

[0049] Specifically, the communication master 100 includes an interface 001, an interface 002, ... an interface 00N, the communication slave 1 includes an interface 10, and the interface 10 includes an input logic 12 and an output logic 13. The communication slave 1 The input logic 12 is connected to the interface 001 of the communication master 100 through the...

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PUM

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Abstract

The embodiment of the invention discloses a communication slave, a bus cascading method and a bus cascading system. When the cascading hierarchy has two levels, the bus cascading system comprises a communication host, a first communication slave connected with the communication host, and a second communication slave connected with the first communication slave. The method comprises that: the first communication slave receives a level signal of the communication host, which is opposite to the level defaulted by the first communication slave self; and the first communication slave changes self defaulted level state according to the received level signal, and changes self defaulted logical address. By adopting the embodiment of the invention to carry out logical address register on the communication host, the communication host does not need to increase a communication port to connect the communication slave, and the communication slave can determine self logical address so as to realize logical address register and identification.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a communication slave, a bus cascade connection method and a system. Background technique [0002] At present, in the bus system of communication exchange, a serial bus physical layer standard RS485, Peripheral Component Interconnection (PCI, Peripheral Component Interconnection), Ethernet, etc. are commonly used. Communication lines are shared between bus devices, which is low in cost and high in reliability, but the devices on the bus must use the bus in time-sharing. The most commonly used bus is controlled by the communication host. There are multiple communication slaves connected to the bus. The communication host should reserve enough physical interfaces to support the access of up to N communication slaves, but this will cause the volume of the communication host Bulk and increased manufacturing costs. [0003] figure 1 It is an existing bus connection method. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40H04L29/06
Inventor 王勇
Owner HUAWEI TECH CO LTD
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