CN101692659A

CN101692659A - ARM7-based WTB-RS422 gateway

Info

Publication number: CN101692659A
Application number: CN200910187337A
Authority: CN
Inventors: 于跃; 吴健; 杜振环; 王晓鹏; 李春昭
Original assignee: CNR Dalian Electric Traction R& D Center Co Ltd
Current assignee: CRRC Dalian R&D Co Ltd
Priority date: 2009-09-11
Filing date: 2009-09-11
Publication date: 2010-04-07

Abstract

The invention discloses an ARM7-based WTB-RS422 gateway, which is characterized by comprising a WTB board card, a RS422 board card, a CPU board card, a power supply board card and a back board, wherein the WTB board card, the RS422 board card and the CPU board card are connected through a back board bus on the back board; the power supply board card supplies a working voltage to the WTB board card, the RS422 board card and the CPU board card; the WTB board card takes charge of data acquisition and transmission of WTB bus equipment; the RS422 board card takes charge of data acquisition and transmission of RS422 bus equipment; and the CPU board card takes charge of central processing of data of the WTB bus equipment and the RS422 bus equipment. The gateway is TCN network equipment in accordance with international standard, has the characteristics of novel design, high reliability and the like, and is suitable for wide application in fields of China railway industry and the like.

Description

WTB-RS422 gateway based on ARM7

Technical field

WTB-RS422 gateway based on ARM7 of the present invention relates to the Computer Communication Networks control system.Be widely used in the industrial control field that real-times such as railroad train, subway train and urban rail transit vehicles are had relatively high expectations.

Background technology

Along with the needs of railway great-leap-forward development, trains such as CRH5, CRH2, HXD1 are used on the basic routing line at home widely, and external advanced TCN network control technology has been introduced domestic.Simultaneously the electric locomotive vehicle of China also begins to adopt successively the TCN technology, promptly solves problems such as the collection of on-the-spot all signals and control by the TCN network.

IEC61375-1 " TCN " (being called for short the TCN standard) is an international standard, also is China railways industry standard TB/T3035-2002.The TCN standard definition multifunction vehicle bus MVB and two kinds of forms of wired train bus WTB, it is standard for Fieldbus for this special application field design of railway systems, it has formulated the communication system of an opening, thus make various rolling stocks can mutually interconnected extension, the equipment of different vendor can be interconnected.

The RS422 bus is one of fieldbus of industry spot widespread usage, and the TIA/EIA-422-A standard is its international standard.The RS422 bus standard is followed the ISO/OSI model, has adopted physical layer wherein, data link layer and application layer.The RS422 bus is the serial communication network of distributed control of a kind of effective support and real-time control system, has outstanding reliability, real-time and flexibility.

At present, because the service request of domestic RS422 interface train safety monitoring system needs by the RS422 interface train operation data to be sent in the train safe supervisory control system, be convenient to train traffic safety and maintenance.

So the WTB-RS422 gateway just becomes the essential key equipment of TCN network control system, make RS422

Reach seamlessly with the WTB network and to combine.Succeeding in developing of WTB-RS422 gateway, indicate that whole WTB-RS422 switch technologies capture, filled up the blank in domestic this field, make the TCN network control of China technical a new step, have realistic meaning for the technological innovation of domestic rail vehicles industry.

Summary of the invention

The purpose of this invention is to provide a kind of novel WTB-RS422 gateway, be mainly used in the WTB network control system of railroad train, subway train and urban track traffic industry, the network equipment that connects the RS422 bus interface, make it both to have had WTB process data function, message data function and bus management function, also had RS422 link layer management function and application level function.

Technical solution of the present invention is achieved in that

A kind of WTB-RS422 gateway based on ARM7 is characterized in that comprising WTB integrated circuit board, RS422 integrated circuit board, CPU board card, power supply integrated circuit board and backboard.Described WTB integrated circuit board, RS422 integrated circuit board and CPU board card all are to be connected by the core bus on the backboard, and the power supply integrated circuit board provides operating voltage for WTB integrated circuit board, RS422 integrated circuit board and CPU board card; Described WTB integrated circuit board is responsible for the data acquisition and the transmission of WTB bus apparatus; Described RS422 integrated circuit board is responsible for the data acquisition and the control of RS422 equipment.

Described WTB integrated circuit board comprises MCU control circuit, FPGA encoding and decoding processor and WTB bus driver.Described device data stream allows through FPGA encoding and decoding processor from core bus, import the MCU control circuit into and be converted into HDLC form message, be sent to FPGA encoding and decoding processor and generate Manchester signal, carry out the signal adjustment by the WTB bus driver again, be sent to the WTB bus and get on; Described WTB bus integrated circuit board can also receive the transmission data on the WTB vehicle bus, passes back to after treatment on the core bus of backboard.

Described RS422 integrated circuit board comprises that RS422 isolates optocoupler and RS422 protocol controller, described device data stream is sent to RS422 from core bus and isolates the signal level that optocoupler becomes isolation, is converted into link packet formation differential signal by the RS422 protocol controller again and is sent to the RS422 bus; Described RS422 bus integrated circuit board can also receive the transmission data on the RS422 bus, passes back to after treatment on the core bus of backboard.

Described CPU board card comprises central processing unit, FLASH, SDRAM, electric power management circuit, reset circuit and Nonvolatile memory cell, described central processing unit transmits WTB bus and RS422 bus data stream respectively, and the core bus of process backboard imports WTB bus integrated circuit board and RS422 bus integrated circuit board into.

Described MCU control circuit reads WTB process data, message data or monitoring data with inquiry mode, be converted into the HDLC message format, import into and form Manchester coded signal in the FPGA encoding and decoding processor, perhaps will be from Manchester coded signal of FPGA encoding and decoding processor, resolve to standard parallel signal data through handling, import the MCU control circuit into.

Described RS422 protocol controller is the differential signal that the isolation signals of will isolate optocoupler from RS422 is converted into the link packet form, be sent on the RS422 bus, perhaps will be from the differential signal on the RS422 bus, the data flow that is converted into standard is sent to RS422 and isolates optocoupler.

Described core bus structure is combined into an integral device with various integrated circuit boards, and the power supply integrated circuit board adopts modularized design that the power supply of whole gateway is provided.

Compared with prior art, this gateway has solved the data communication problem of special wired train bus WTB and general RS422, have modern design, high reliability, high flexibility and characteristics with low cost, be with a wide range of applications in rolling stock industry and association area.

Description of drawings

Fig. 1 is a structured flowchart of the present invention;

Fig. 2 is a WTB integrated circuit board structured flowchart of the present invention;

Fig. 3 is a RS422 integrated circuit board structured flowchart of the present invention;

Fig. 4 is a CPU board card structure block diagram of the present invention;

Fig. 5 is ARM7 and peripheral circuit interface circuit figure thereof in the CPU board card of the present invention;

Fig. 6 is the circuit connection diagram that RS422 isolates optocoupler and RS422 protocol controller in the RS422 integrated circuit board of the present invention;

Fig. 7 is the circuit connection diagram of MCU control circuit in the WTB bus integrated circuit board of the present invention;

Fig. 8 is a network topological diagram of the present invention;

Fig. 1 is a specification digest accompanying drawing of the present invention.

Among the figure: 1, WTB integrated circuit board, 2, the RS422 integrated circuit board, 3, the CPU board card, 4, power supply integrated circuit board, 5, backboard, 6, the MCU control circuit, 7, FPGA encoding and decoding processor, 8, the WTB bus driver, 9, RS422 isolates optocoupler, 10, RS422 protocol controller, 11, central processing unit, 12, FLASH, 13, SDRAM, 14, electric power management circuit, 15, reset circuit, 16, Nonvolatile memory cell.

Embodiment

As shown in Figure 1, a kind of WTB-RS422 gateway based on ARM7, it is characterized in that comprising WTB integrated circuit board 1, RS422 integrated circuit board 2, CPU board card 3, power supply integrated circuit board 4 and backboard 5, described WTB bus integrated circuit board 1, RS422 integrated circuit board 2 are connected by the core bus on the backboard 5 with CPU board card 3; Described power supply integrated circuit board 4 is installed on the backboard 5 unifies power supply to WTB bus integrated circuit board 1, RS422 integrated circuit board 2 and CPU board card 3; Described WTB bus integrated circuit board 1 is responsible for gathering and controlling the data flow of equipment on the WTB bus; Described RS422 integrated circuit board 2 is responsible for gathering and controlling the data flow of equipment on the RS422 bus; The central authorities that described CPU board card 1 is responsible for WTB bus and RS422 bus apparatus data handle.

As shown in Figure 2, WTB bus integrated circuit board 1 comprises that the WTB integrated circuit board comprises MCU control circuit 6, FPGA encoding and decoding processor 7 and WTB bus driver 8.Described device data stream allows through FPGA encoding and decoding processor 7 from core bus, import MCU control circuit 6 into and be converted into HDLC form message, be sent to FPGA encoding and decoding processor 7 and generate Manchester signal, carry out the signal adjustment by WTB bus driver 8 again, be sent to the WTB bus and get on; Described WTB bus integrated circuit board 1 can also receive the transmission data on the WTB vehicle bus, passes back to after treatment on the core bus of backboard 5.MCU control circuit 6 provides WTB link layer service function, has finished major-minor management of process function.WTB bus driver 8 has improved the bus driver ability, has the high-frequency interferencing signal inhibitory action, and EMC satisfies the EN50155 standard.

As shown in Figure 3, RS422 integrated circuit board 2 comprises that RS422 isolates optocoupler 9 and RS422 protocol controller 10, described device data stream is sent to RS422 from core bus and isolates the signal level that optocoupler 9 becomes isolation, is converted into link packet formation differential signal by the RS422 protocol controller again and is sent to the RS422 bus; Described RS422 bus integrated circuit board can also receive the transmission data on the RS422 bus, passes back to after treatment on the core bus of backboard 5.RS422 isolates 9 pairs of data-signals of optocoupler and has carried out electrical isolation, has the effect that suppresses electrical Interference.

As shown in Figure 4, cpu bus integrated circuit board 3 comprises central processing unit 11, FLASH 12, SDRAM 13, electric power management circuit 14, reset circuit 15 and Nonvolatile memory cell 16, described central processing unit 11 transmits WTB bus and RS422 bus data stream respectively, and the core bus of process backboard 5 imports WTB bus integrated circuit board 1 and RS422 bus integrated circuit board 2 into.Central processing unit 11 is ARM7 nuclear microprocessors, is responsible for the processing operation function of program.FLASH 12 and SDRAM 13 are respectively central processing unit 11 program memory space and running space are provided.Electric power management circuit 14 provides 3.3V and 5V power supply for whole integrated circuit board.In addition, central processing unit 11 peripheral also arrangement reset circuit 15 and Nonvolatile memory cells 16.

Shown in Fig. 5～7, wherein MCU control circuit 6 comprise IS62C1024, Z8S180 and Z85230 chip, FPGA encoding and decoding processor 7 for XCS30XL, fpga logic processor 9 for XC2S30, RS422 isolate optocoupler 9 for HCPL0661, RS422 protocol controller 10 for MAX488, central processing unit 11 comprises AS1117M3 for AM29LV160B, SDRAM 13 for MT48CL4M16A2, electric power management circuit 14 for NET+50, FLASH 12 and MIC5207 chip, reset circuit 15 are DS 1265W for IMP706, Nonvolatile memory cell 16; Central processing unit 11 is the core of whole system for the ARM7 master controller, and it is made up of two parts: i.e. hardware and software.The effect of hardware mainly is the exchanges of being responsible for the processing of the central authorities of WTB bus and RS422 data and two kinds of bus data streams.Software is then finished network protocol stack function and application controlled function.MCU control circuit 6 and RS422 protocol controller 10 are respectively the core devices of WTB bus and RS422 bus, are responsible for finishing the link layer functionality service.

Be connected to core bus in the WTB-RS422 gateway between each integrated circuit board and the integrated circuit board, this core bus has been followed the external memory access bus of standard, the core bus socket is the physical structure that above-mentioned integrated circuit board is coupled together, it carries out cabling and level match with the peace of the signal between integrated circuit board according to special requirement, and the 24V external power power supply interface of whole WTB-RS422 gateway is provided simultaneously.Described back plate design is that the core bus signal has high reliability, good flexibility energy and Scalable Performance according to the characteristics design of the on-the-spot electric circumstance of railway systems; What power supply integrated circuit board 4 adopted is the method for modularized design, and the core power module that uses is that Switzerland VACON company produces the power module chip, and purpose is that+24V voltage transitions is+5V power supply, supplies with that integrated circuit board uses in the cabinet, is a very stable power.

By the constructed WTB-RS422 gateway of above-mentioned four integrated circuit boards, be connected with the inner RS422 network equipment of train, the train information on the RS422 network equipment can carry out the exchange of data flow with the WTB network like this.If need more RS422 in the train, just need the such equipment of a cover so in each RS422.The canonical system framework map is formed the WTB-RS422 gateway by WTB bus integrated circuit board, RS422 integrated circuit board and CPU board card as shown in Figure 8, connects WTB network and RS422 simultaneously.The RS422 network also comprises the on-the-spot IO equipment that has the RS422 interface.IO equipment is given RS422 integrated circuit board with field data, generates RS422 data format message, is sent on other equipment on the WTB bus by CPU board card and WTB bus integrated circuit board then.Simultaneously also the data of other equipment of WTB can be sent to IO equipment conversely.The data flow of whole system as mentioned above.Certainly, can also be with a lot of other equipment according to the requirement of RS422 system, such as intelligent display unit, train supervision unit etc.

Claims

1. WTB-RS422 gateway based on ARM7, it is characterized in that comprising WTB integrated circuit board (1), RS422 integrated circuit board (2), CPU board card (3), power supply integrated circuit board (4) and backboard (5), described WTB integrated circuit board (1), RS422 integrated circuit board (2) and CPU board card (3) are connected by the core bus on the backboard (5); Described power supply integrated circuit board (4) is installed in backboard (5) and upward WTB integrated circuit board (1), RS422 integrated circuit board (2) and CPU board card (3) is unified power supply; Described WTB integrated circuit board (1) is responsible for gathering and controlling the data flow of equipment on the WTB bus; Described RS422 integrated circuit board (2) is responsible for gathering and controlling the data flow of equipment on the RS422 bus; The central authorities that described CPU board card (1) is responsible for WTB bus and RS422 bus apparatus data handle.

2. the WTB-RS422 gateway based on ARM7 according to claim 1, it is characterized in that described WTB integrated circuit board comprises MCU control circuit (6), FPGA encoding and decoding processor (7) and WTB bus driver (8), described device data stream allows through FPGA encoding and decoding processor (7) from core bus, import MCU control circuit (6) into and be converted into HDLC form message, be sent to FPGA encoding and decoding processor (7) and generate Manchester signal, carry out the signal adjustment by WTB bus driver (8) again, be sent to the WTB bus and get on; Described WTB bus integrated circuit board (1) can also receive the transmission data on the WTB vehicle bus, passes back to after treatment on the core bus of backboard (5).

3. the WTB-RS422 gateway based on ARM7 according to claim 2, it is characterized in that described RS422 integrated circuit board comprises that RS422 isolates optocoupler (9) and RS422 protocol controller (10), described device data stream is sent to RS422 from core bus and isolates the signal level that optocoupler (9) becomes isolation, is converted into link packet formation differential signal by RS422 protocol controller (10) again and is sent to the RS422 bus; Described RS422 bus integrated circuit board can also receive the transmission data on the RS422 bus, passes back to after treatment on the core bus of backboard (5).

4. the WTB-RS422 gateway based on ARM7 according to claim 3, it is characterized in that described CPU board card comprises central processing unit (11), FLASH (12), SDRAM (13), electric power management circuit (14), reset circuit (15) and Nonvolatile memory cell (16), described central processing unit (11) transmits WTB bus and RS422 bus data stream respectively, and the core bus of process backboard (5) imports WTB bus integrated circuit board (1) and RS422 bus integrated circuit board (2) into.

5. the WTB-RS422 gateway based on ARM7 according to claim 4, it is characterized in that described MCU control circuit (6) reads WTB process data, message data or monitoring data with inquiry mode, be converted into the HDLC message format, import into and form Manchester coded signal in the FPGA encoding and decoding processor (7), perhaps will be from Manchester coded signal of FPGA encoding and decoding processor (7), resolve to standard parallel signal data through handling, import MCU control circuit (6) into.

6. the WTB-RS422 gateway based on ARM7 according to claim 5, it is characterized in that described RS422 protocol controller (10) is the differential signal that the isolation signals of will isolate optocoupler (9) from RS422 is converted into the link packet form, be sent on the RS422 bus, perhaps will be from the differential signal on the RS422 bus, the data flow that is converted into standard is sent to RS422 and isolates optocoupler (9).