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Instrument bus system based on bus topology

A bus system and bus-type technology, applied in the direction of bus network, data exchange through path configuration, etc., can solve problems such as unfavorable system expansion, and achieve the effect of reliable signal transmission, high data transmission rate, and enhanced independence

Inactive Publication Date: 2017-05-31
BEIJING INST OF ELECTRONICS SYST ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the communication protocol of each module is changed, it needs to be modified at the logical level, which is not conducive to the expansion of the system

Method used

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  • Instrument bus system based on bus topology
  • Instrument bus system based on bus topology
  • Instrument bus system based on bus topology

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0033] In this example, the switch module is directly integrated on the backplane, and the switch chip used is a dedicated FPGA chip, which has the following functional characteristics: 1), supports router and switch function configuration; 2), supports 1K MAC addresses; 3), Support auto-negotiation of working mode and auto-port flip; 4), support external configuration chip for function configuration.

[0034] There are three ways to configure and control the function of the dedicated FPGA chip: through the pull-up or pull-down resistor, configure the pin level of the chip; through the MII / RMII interface, the external processor uses the SMI interface to access the MII register for chip control and management; through the configuration Chip EEPROM, when the chip starts, it will automatically read the contents of the EEPROM chip and configure the on-chip registers. According to actual needs, the switch chip FPGA chip is configured as an 8-port switch mode for remote computers an...

example 2

[0040] The signal is input and output through the PHY interface of the FPGA chip. In order to enable interconnection between different devices, a transformer is used for differential voltage conversion, and at the same time, the network device can be isolated. In this example, each transformer supports two channels of network transmission and reception. image 3 A schematic diagram of the output interface of the FPGA chip is shown.

[0041] One possible transformer structure is as Figure 4 As shown, the differential voltage output by the FPGA chip is based on AVCC, and the voltage conversion and isolation are performed through the transformer. The output of the transformer can be directly connected to the RJ45 socket, or connected to other network devices. Since the present invention uses the W5100 to communicate with the backplane bus, the reference voltages REF1 and REF2 need to be powered by 3.3V. Each single-chip transformer supports the transmission and reception of two ...

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Abstract

The invention discloses an instrument bus system based on bus topology. The instrument bus system comprises an embedded computer module, an application module and a switch module, the embedded computer module is electrically connected with the application module by the bus topology and is connected with a remote network through the switch module; the application module comprises a communication module, an analog module and a semaphore module, and LVDS buses are used as communication buses of the modules. Under the bus topology structure, the system only needs to separately set an IP address for the modules to change the communication protocols of the modules without performing modification on the logic level, and thus the scalability of the system can be enhanced.

Description

technical field [0001] The invention relates to the field of instrument bus technology. More specifically, it relates to an instrument bus system based on bus topology. Background technique [0002] For any instrument that can be associated with system-level testing, the bus is an indispensable unit, carrying important functions such as data transmission and control in test equipment and systems. At present, the most used instrument buses are PXI, VXI, RS-485, RS-422, etc. The embedded computer of the simulator uses RS-485 bus to communicate with each sub-module, and HDLC protocol is used for data transmission. RS-485 adopts half-duplex working mode and supports multi-point data communication. The RS-485 bus network topology generally adopts a terminal-matched bus structure, that is, a bus is used to connect each node in series, and a ring or star network is not supported. RS-485 uses balanced transmission and differential reception, so it has the ability to suppress comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40
CPCH04L12/40
Inventor 王蕾蕾牛慧博邱辉
Owner BEIJING INST OF ELECTRONICS SYST ENG
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