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Communication adapter

A communication adapter and matching problem technology, applied in the field of bus, can solve the problems of low real-time requirements, no DPV1, occupying communication time, etc., to solve the problem of network protocol conversion and matching, save the number of wires, and achieve obvious economic benefits. Effect

Inactive Publication Date: 2006-03-29
SHANGHAI ELECTRICAL APPLIANCES RES INSTGROUP
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AI Technical Summary

Problems solved by technology

[0012] For the Profibus-DP communication adapter, although there are Profibus-DP communication modules developed for medium and low voltage power distribution systems in China, many technical defects have been found through the use of users, mainly because the developed modules only use DPV0 (periodic data Exchange) agreement, did not use DPV1 (aperiodic data exchange) agreement
The amount of data transmitted by low-voltage electrical appliances is relatively large, and some parameters do not require high real-time performance. If only DPV0 is used for transmission, it will take up a lot of communication time and the overall performance will be greatly affected.

Method used

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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] refer to figure 1 , which is a hardware block diagram of the Profibus-DP communication adapter of the present invention.

[0028] As shown in the figure, the hardware of the communication adapter includes: Profibus-DP 1, RS485 driver 2, optocoupler isolation 3, SPC34, STC microcontroller 5, optocoupler isolation 6, RS485 driver 7, RS323 driver 8, Modbus 9, main 5VDC power supply 10. Power supply DC-DC module 11, Modbus communication 5VDC power supply 12, Profibus-DP communication 5VDC power supply 13, status indication 14, address setting 15.

[0029] The signal transmission of the above circuit: starting from Profibus-DP 1, it is processed by RS485 drive 2, optocoupler isolation 3, SPC3 4, STC single chip microcomputer 5, and then through optocoupler isolation 6, RS485 drive 7, RS323 drive 8, Modbus 9 Conversion, and then reversely transmit ...

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Abstract

This invention relates to a communication adaptor for converting and matching network protocols in different bus devices including profibus-DP, drive RS485, light-couple isolation, SPC3, single-chip processor STC, light couple isolation, device RS485, device RS232, Modbus, a primary 5VDC supplier, a DC-DC supply module, a Modbus communication 5VDC supplier, a profibus-DP communication 5VDC supplier, a state indication and address design. The circuit signals are transmitted from profibus-DP via RS485 light couple isolation SPC3 and processed by STC, then via light-couple isolation, RS485, RS232 and Modbus conversion to be delivered to profibus-DP inversely. The software includes SPC3 flows primary program flow and interruption program flow.

Description

technical field [0001] The invention relates to a Profibus-DP communication adapter, which is used for low-voltage equipment with Modbus communication function to access the Profibus-DP bus, belonging to the field of bus technology. Background technique [0002] With the development of science and technology, a bus technology has been developed, which is changing the appearance of some fields [0003] Profibus bus technology adopts data bus, and the master station only needs to lead out two or a few lines to connect various field devices to provide configuration, monitoring and diagnosis functions for the devices. [0004] The development of bus technology has brought great impact to low-voltage electrical products, but at present, products in the field of low-voltage power distribution cannot be directly connected to the (Profibus) network to form a (Profibus) bus-type power distribution system. There are basically two ways to add a (Profibus) interface to the device: one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04L12/40
Inventor 殷君薛吉
Owner SHANGHAI ELECTRICAL APPLIANCES RES INSTGROUP
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