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Communication gateway implementation method

An implementation method and communication gateway technology, which is applied in the direction of network connection, data exchange network, digital transmission system, etc., can solve problems such as delay in issuing commands, large communication delay, and poor communication, so as to improve data delay time and improve efficiency , the effect of improving the response speed

Inactive Publication Date: 2015-12-23
北京和欣运达科技有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the upper computer often accesses the variables in the BACnet device more than a certain frequency, it will cause extremely poor communication, large communication delay, and the command sent on the software platform will be delayed or even lost.

Method used

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  • Communication gateway implementation method

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Embodiment Construction

[0019] The specific embodiments of the present invention will be described in detail below.

[0020] Such as figure 1 As shown, one side of the gateway is connected to the host computer, and the other side of the gateway is connected to multiple controllers.

[0021] A method for implementing a communication gateway includes the following steps:

[0022] (1) The gateway on the MSTP bus generates a gateway table and initializes all variable lists. The gateway table contains the variable lists of all controllers;

[0023] (2) When the host computer on the BACnet / IP side sends a data request frame to the gateway, the gateway directly reads the data corresponding to the variable from the gateway table and feeds back the data to the host computer, and at the same time marks the variable in the gateway table ;

[0024] (3) Traverse all variables in the gateway table to find all marked variables;

[0025] (4) According to all the marked variables, the gateway sends data request frames to the ...

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Abstract

The invention relates to a communication gateway implementation method, which comprises the steps of: (1), a gateway generates a gateway table and initializes all variable lists, wherein the gateway table comprises the variable lists of all controllers; (2), the gateway directly reads data corresponding to a variable and feeds back the data to an upper computer when the upper computer sends a data request frame to the gateway, and marks the variable in the gateway table; (3), all variables in the gateway table are traversed, and all the marked variables are found out; (4), the gateway sends the data request frames to the controllers in sequence according to all the marked variables, and requests update of the marked variables; (5) and the controllers respond to the data request frames, update numerical values corresponding to the marked variables in the gateway table, and eliminates the mark of the variables. The communication gateway implementation method has the beneficial effects of improving the efficiency of the system and greatly increasing response speed of data request.

Description

Technical field [0001] The invention belongs to the field of communication control, and specifically relates to a method for implementing a communication gateway. Background technique [0002] BACnet is a protocol standard developed by the American Society of Heating, Ventilation and Air-Conditioning Engineers (ASHARE) and widely popular in the world. The protocol implemented on the RS-485 bus is BACnet / MSTP, and its highest communication baud rate is 76800BPS. The protocol implemented is BACnet / IP, and its communication rate is between 10M and 1G. The controller equipment installed in the field is usually connected to the MSTP bus, and the data interface of the upper computer is usually Ethernet / IP. Therefore, the BACnet / MSTP to BACnet / IP gateway is the key technical equipment in the BACnet system. [0003] The current gateways of various manufacturers, for those frames that request and respond to variable data, only change the underlying network routing information and simply fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/771H04L12/66H04L45/60
Inventor 张青
Owner 北京和欣运达科技有限公司
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