Data communication method applied to rack-mounted plant station terminal

Abstract

The invention discloses a data communication method applied to a rack-mounted plant station terminal. The data communication method comprises the following steps: 1) opening virtual equipment nodes ofeach channel of each daughter board by a mainboard application; 2) the application writes the data into a virtual node through system calling, and a driver packages the data with an equipment addressand a channel number into a bus frame and inserts the bus frame into a data queue for queuing; 3) checking the queue by the kernel host process, waiting if the queue is empty, and entering the step 4if the queue is not empty; 4) taking a current head node of the queue, writing the current head node into an RS485 serial port, and broadcasting to each daughter board; 5) recognizing and receiving the frame by the daughter board matched with the broadcast frame; 6) the daughter board sends a reply frame to the mainboard; and 7) after the mainboard receives the reply frame, analyzing the data contained in the reply frame into the FIFO, and skipping to the step 3. According to the method, the virtual device nodes of the channels of the daughter boards are created on the system layer, bus protocol analysis and communication are achieved, an application can focus on service data processing, and system resources and performance are further saved.

Description

technical field [0001] The invention relates to the technical field of computer bus communication, in particular to a data communication method applied to a rack-type factory station terminal. Background technique [0002] The power station terminal is a terminal device used in power plants and substations. It can realize the collection and storage of energy meter information and the detection of the operating conditions of the energy meter, and manage and forward the collected information. Rack-type plant terminal refers to the plug-in plant terminal that can be installed in the standard panel cabinet of power plants and substations. Various types of acquisition modules and communication modules can be flexibly configured according to needs. The sub-boards are connected to the same bus, and each board device on the bus has a fixed address, and the main board device communicates by specifying the address of the slave device in the transmission data. [0003] For the communi...

AI Technical Summary

Problems solved by technology

[0003] For the communication of rack-mounted factory station terminals, the existing technology usually implements bus protocol analysis at the application layer, which requires the application to consume resources to distinguish the sub-devices that are physically connected, and cannot allow the application to focus on business data processing; moreover, in Application layer analysis of the bus protocol requires the bottom layer to transmit all data received on the bus to the application layer, which will include bus protocols that have nothing to do with business data. Copying a large amount of data memory at the application layer will inevitably waste system resources and performance

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