CN102457446A

CN102457446A - RS485-multifunction vehicle bus (RS485-MVB) gateway based on VxWorks

Info

Publication number: CN102457446A
Application number: CN2010105194734A
Authority: CN
Inventors: 毛强
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-10-25
Filing date: 2010-10-25
Publication date: 2012-05-16

Abstract

The invention discloses an RS485-multifunction vehicle bus (RS485-MVB) gateway based on application of a VxWorks operating system to a train. The invention provides the RS485-MVB gateway based on VxWorks, the gateway can be comprehensively applied to a communication interlink between an RS485 bus and an MVB bus and has the advantages of stable and reliable performance and low communication error rate. The technical scheme provided by the invention comprises that: the hardware system of the RS485-MVB gateway comprises a central processing unit (CPU) subsystem, a memory subsystem, an MVB communication subsystem, a power supply subsystem and other communication interface subsystems; a 32-bit reduced instruction set computer (RISC) COLDFIRE processor is adopted to construct the gateway and operate a VxWorks embedded real-time operating system; and the RS485-MVB gateway is connected with communication equipment having the RS485 bus through the RS485 bus and is switched in an MVB network through a standard MVB interface by communication protocol conversion.

Description

A kind of RS485-MVB gateway based on VXWORKS

Technical field:

The present invention relates to a kind ofly, relate in particular to a kind of RS485-MVB gateway based on VXWORKS based on the application technology of VXWORKS operating system in train.

Background technology:

The train control system that current main in the world locomotive supplier provides for the user has all adopted the TCN network that meets the IEC61375 standard, like the SIBAS32 of Siemens Company, the MITRAC of BOMBARDIER company etc.The DTECS network control system of Zhuzhou Nancheshidai Electric Co., Ltd's independent research has also adopted the TCN network.TCN adopts 2 grades of topological structures, and train bus-line adopts WTB, and vehicle bus adopts MVB.The TCN network is more and more accepted by the manufacturer of countries in the world and user; But still have the technology of some other fieldbus also on some rolling stocks, to be applied; Like CAN bus and RS485 bus etc.; Thereby have the interconnected problem of communication between the multiple different fieldbus, cause data communication chaotic.

Summary of the invention:

The present invention provides a kind of stable performance, reliable exactly for addressing the above problem, and the communication error rate is low, but overall application is at the RS485-MVB gateway based on VXWORKS based on RS485 bus and the interconnection of MVB bus communication.

For reaching above purpose, the present invention adopts following technical scheme, RS485-MVB gateway hardware system comprise cpu subsystem, memory sub-system, MVB communication subsystem, power subsystem, other communications interface subsystems; Its design feature is to adopt 32 RISC COLDFIRE processor structure gateways, operation VXWORKS embedded real-time operating system; The RS485-MVB gateway links to each other with the communication equipment with RS485 through the RS485 bus, and the conversion of process communication protocol, through the MVB interface access MVB network of standard.

The beneficial effect of the invention:

The present invention has solved the interconnection problems of MVB and RS485 bus effectively, can be widely used on subway, the magnetic suspension train, and this gateway also can be separately as RS485 communication equipment or MVB communication equipment.

Description of drawings:

Fig. 1 is a RS485-MVB gateway communication system construction drawing.

Embodiment:

RS485-MVB gateway hardware system comprise cpu subsystem, memory sub-system, MVB communication subsystem, power subsystem, other communications interface subsystems; Its design feature is to adopt 32 RISCCOLDFIRE processor structure gateways, operation VXWORKS embedded real-time operating system; The RS485-MVB gateway links to each other with the communication equipment with RS485 through the RS485 bus, and the conversion of process communication protocol, through the MVB interface access MVB network of standard.

That CPU adopts is 32 COLDFRIE flush bonding processor MCF5235, and dominant frequency is 150MHz; That FLASH adopts in the memory sub-system is the 28F128J3A of 16M, and this FLASH is as the storage of plate level support package BSP, VXWORKS program, MVB software module, ISAGRAF application program, RS485 software module, fault data etc.; MVB communication subsystem hardware provides the interface channel with the MVB bus communication for the RS485-MVB gateway, and it comprises communication memory TM, cpu i/f buffering and control logic and the MVB bus physical layer interface of MVB communication controler, 1MB; DC/DC switch power module input voltage range is that DC77～137V, 5V export, power is 10W in the power subsystem, and power subsystem is the power supply that whole RS485-MVB gateway provides 5V, 3.3V and 2.5V; Other communications interface subsystems comprise RS232 interface, 10/100M Ethernet interface, RS485 communication interface.

The modularization hierarchy is adopted in the system design of RS485-MVB gateway software, and plate level support package BSP is as the bottom of system, for operating system and user task provide the standard that hardware device is conducted interviews driving interface; BSP mainly provides the guiding of device drives and operating system, comprises that System self-test drives, the driving of serial ports, SDRAM driving, the driving of network interface, the driving of FLASH etc.; VXWO-RKS KERNEL is a multitask kernel, has task scheduling mechanism, intertask communication and interrupt processing mechanism etc.; According to the needs of this gateway system, the VXWORKS kernel is reduced, the operating system that satisfies the function needs of a minimum is provided; The MVB software module is a MVB link layer program, just the core of MVB communication process, the mainly processing of implementation procedure data, message data, monitoring data etc.; The MVB software module can be confirmed the cycle of COM1 and each port data of MVB according to the MVB configuration file; And the api interface function of the required functional block of encapsulation image development environment ISAGRAF, process of transmitting data function piece SET_MVB_PORT_VALUE needed api interface function MVB_set_source_data and the needed api interface function of receiving course data function piece GET_MVB_PORT_VALUE MVB_get_sink_data be provided; Graphical development environment bottom software bag ISAGRAF TARGET is as a kind of special task, be responsible for to the parsing of ISAGRAF application program carry out, with debug terminal communicate by letter and with the interface of other application tasks; Api interface function according to RS485-MVB communication protocol and RS485-MVB protocol conversion bottom software provide has encapsulated communication interface, and corresponding communication and controlled function piece etc. are provided.

Claims

1. the RS485-MVB gateway based on VXWORKS comprises cpu subsystem, memory sub-system, MVB communication subsystem, power subsystem, other communications interface subsystems; It is characterized in that adopting 32 RISC COLDFIRE processor structure gateways, operation VXWORKS embedded real-time operating system; The RS485-MVB gateway links to each other with the communication equipment with RS485 through the RS485 bus, and the conversion of process communication protocol, through the MVB interface access MVB network of standard.

2. according to the said a kind of RS485-MVB gateway based on VXWORKS of claim 1, that it is characterized in that the CPU employing is 32 COLDFRIE flush bonding processor MCF5235, and dominant frequency is 150MHz; That FLASH adopts in the memory sub-system is the 28F128J3A of 16M, and FLASH is as the storage of plate level support package BSP, VXWORKS program, MVB software module, ISAGRAF application program, RS485 software module, fault data etc.; MVB communication subsystem hardware provides the interface channel with the MVB bus communication for the RS485-MVB gateway, and it comprises communication memory TM, cpu i/f buffering and control logic and the MVB bus physical layer interface of MVB communication controler, 1MB; DC/DC switch power module input voltage range is DC77～137V in the power subsystem, 5V output, and power is 10W, power subsystem is the power supply that whole RS485-MVB gateway provides 5V, 3.3V and 2.5V; Other communications interface subsystems comprise RS232 interface, 10/100M Ethernet interface, RS485 communication interface.

3. according to the said a kind of RS485-MVB gateway of claim 1 based on VXWORKS; It is characterized in that RS485-MVB gateway software system design employing modularization hierarchy; Plate level support package BSP is as the bottom of system, for operating system and user task provide the standard that hardware device is conducted interviews driving interface; BSP mainly provides the guiding of device drives and operating system, comprises that System self-test drives, the driving of serial ports, SDRAM driving, the driving of network interface, the driving of FLASH etc.; VXWO-RKS KERNEL is a multitask kernel, has task scheduling mechanism, intertask communication and interrupt processing mechanism etc.; According to the needs of this gateway system, the VXWORKS kernel is reduced, the operating system that satisfies the function needs of a minimum is provided; The MVB software module is a MVB link layer program, just the core of MVB communication process, the mainly processing of implementation procedure data, message data, monitoring data etc.; The MVB software module can be confirmed the cycle of COM1 and each port data of MVB according to the MVB configuration file; The api interface function of the required functional block of encapsulation image development environment ISAGRAF is provided, process of transmitting data function piece SET_MVB_PORT_VALUE needed api interface function MVB_set_source_data and the needed api interface function of receiving course data function piece GET_MVB_PORT_VALUE MVB_get_sink_data; Graphical development environment bottom software bag ISAGRAF TARGET is as a kind of special task, be responsible for to the parsing of ISAGRAF application program carry out, with debug terminal communicate by letter and with the interface of other application tasks; Api interface function according to RS485-MVB communication protocol and RS485-MVB protocol conversion bottom software provide has encapsulated communication interface, and corresponding communication and controlled function piece etc. are provided.