CN100425031C - Locomotive digital network interconnection equipment based on embedded operating system and control method thereof - Google Patents
Locomotive digital network interconnection equipment based on embedded operating system and control method thereof Download PDFInfo
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Abstract
The present invention relates to locomotive digital network interconnection equipment based on embedded operating systems and control method thereof, which comprises a shell, a CPU board, an interface board and an LCD display system. A touch screen and an IC card socket can also be added according to the requirement of practical application. Whole IDD equipment only has one CPU board. The processing of all control parts (which comprise display and communication) of the IDD equipment is completed by placing on a CPU. Even if one CPU is used for completing the functions of the display of the IDD and the communication of a TCN network. A circuit board of the IDD equipment comprises the CPU board and the interface board which are connected through two rectangular sockets. Simultaneously, the IDD equipment adopts an embedded Linux operating system and realizes the function of a real-time protocol packet of an embedded GUI (a graphical user interface) and a TCN (a train control network).
Description
Technical field
The present invention relates to locomotive digital network interconnection equipment and control method thereof, especially for showing various device and the various information relevant on the train, and provide IDD device and control method thereof with the interface of various device interactive information and data for the operator with train operation.
Background technology
IDD (information display device) is the electronic installation that is installed on positions such as drivers' cab operating desk, attendant's operation room, be used to show various device and the various information relevant on the train with train operation, and, show that with communicate by letter be two main functions of IDD realization for the operator provides interface with various device interactive information and data.Railway locomotive was to be divided into two separate CPU to handle with demonstration and the communications portion of IDD in the past, and promptly a CPU finishes and shows control, and another piece CPU is responsible for communication.Correspondingly, two CPU move the separate system of two covers respectively.Like this, the complex structure of IDD system, and improved the hardware manufacturing and the software development cost of equipment.On December 8th, 2004, the CN2661527Y Chinese patent of bulletin disclosed a kind of new type train supervising device screen display.This train supervision device screen display is made up of base plate, IC-card voice plate, power panel, hardboard, CPU card, display card, display screen, communication daughter board, loud speaker, buzzer, thin film switch panel, and have various communication interfaces and an input/output port with main frame, therefore the various data and the Word message of locomotive operation can be reacted fully, in time, Chinese character and graph curve can be in time shown.On September 21st, 2005, the CN2727849Y Chinese patent of bulletin disclosed a kind of supervising device nixie display.This nixie display comprises microprocessor, program storage, static RAM (SRAM), voice warning circuit, communication interface circuit, IC-card, keyboard-display circuit and display circuit.Documents mentioned above equally all exists foregoing problem, therefore necessary this is improved.
Summary of the invention
The objective of the invention is to the deficiency at existing I DD device, it is more reasonable to propose a kind of structure, cpu busy percentage height especially, and real-time is good, novel locomotive digital network interconnection equipment and control method thereof that equipment volume is less.
According to the technology implementation scheme that purpose of the present invention proposed be: a kind ofly be used to show various device and the various information relevant on the train with train operation, and, comprise shell, CPU board, interface board, LCD display system at least for the operator provides I DD device with the interface of various device interactive information and data.Can also increase touch-screen, IC-card seat according to the needs of practical application.Entire I DD device has only a CPU board, the processing of all control sections of IDD device (comprise show and communicate by letter) is placed on the CPU finishes, promptly use a CPU to finish demonstration and the TCN network communicating function of IDD, the circuit board of described IDD device comprises a CPU board and two parts of an interface board, and connects by two rectangular receptacle.Simultaneously described IDD device adopts built-in Linux operating system, realizes embedded type GUI (graphical user interface) and TCN (Train Control network) real-time protocol (RTP) packet function.Wherein:
Described CPU board is the core component of whole system, and the major control function of whole system is all finished by a CPU board.Mainly comprise Flash memory, SDRAM memory, USB Host interface, touch screen interface, Ethernet interface, audio system on the CPU board, use piece of CPLD to finish the plate controlled function, comprise the output of address decoding, internal circuit logic and latch, the distribution etc. of resource in the plate.The power supply of CPU board is provided by interface board, is connected to CPU board by rectangular receptacle; CPU board system reset is controlled by reset controller, comprises three reset source: electrification reset, hand-reset, watchdog reset; The FLASH of CPU board comprises BOOT ROM and user data area; USB Host interface is supported USB low speed and full speed pattern.USB power supply ground and systematically between and be added with magnetic bead on the usb data line, to satisfy the EMC requirement.USB interface is connected on the standard socket on the protecgulum by rectangular receptacle.Audio system provides control signal by processor.Simulated audio signal is connected on the interface board by rectangular receptacle, and the maximum effective value of signal is 1V (RMS), and load impedance should be greater than 10K Ω.When needs use audio system, integrated amplifier circuit as required on interface board.
Described interface board mainly comprises parts such as MVB communication interface (multifunction vehicle bus), power-supply system, peripheral hardware control circuit.The backlight electric power and the control circuit of LCD liquid crystal display screen also are installed on the interface board.Wherein, the MVB subsystem is for adopting MVB 3 kind equipments, and physical layer adopts the ESD+ interface.The MVB subsystem is realized the physical layer and the data link layer of MVB agreement.The initialization of MVB, configuration and TCN Real-time Transport Protocol network are realized by CPU board software.CPLD finishes interface logic and the MVB sequencing control with processor.In the (SuSE) Linux OS kernel, realize the driving that MVB message data is relevant; The address space that directly TM is mapped to CPU is realized the communication of MVB process data.Two LCD back light inverters are housed on interface board, are used for the backlight power supply of LCD liquid crystal display screen.
Described LCD display system adopts built-in Linux operating system.Adopt Tiny X GUI (graphical user interface) as application software development platform.The LCD display system comprises LCD liquid crystal display screen and some control buttons, and the LCD liquid crystal display screen is installed on the protecgulum, is driven by CPU board to show.
A kind of be used to show various device and the various information relevant on the train of the present invention with train operation, and be: the processing mode that adopts facilitation for the operator provides the control method with the IDD device of the interface of various device interactive information and data, implement control and treatment with a CPU board, the processing of all control sections of IDD device (comprise show and communicate by letter) is placed on the CPU finishes, promptly use a CPU to finish demonstration and the TCN network communicating function of IDD, adopt built-in Linux operating system simultaneously, realize embedded type GUI (graphical user interface) and TCN (Train Control network) real-time protocol (RTP) packet function.Entire I DD system control program flow process is as follows:
At first, program is carried out initialization to Chinese font, can be set to 16 dot matrix or 24 raster fonts as required.Then MVB is configured, comprises device address, process data port initialization, message data port initialization, message queue configuration; Configuration to the TCN protocol stack comprises routing configuration, function number configuration etc.; Program also needs to be provided with the startup of radiator fan and stops temperature.User program has used the notion of control, and elements all on the interface all are controls, to the programmer, can set up graphic user interface as playing with building blocks, and can well realize separating of bed boundary and bottom data.User program comprises several windows, and each window all is placed with related content, and program is at first carried out initialization to the content and the form at the interface of each window.User program adopts event-driven structure, and the flow process of program is not to have only the serial of an inlet and several outlets to carry out circuit; On the contrary, program can be in a recurrent state always, in this circulation, program constantly from the outside or inside obtain some incident, such as user's button, the reception of PORT COM data etc., make certain reaction according to these incidents then, and finish certain function, this circulation receives till certain withdraws from message circulation up to program.The user program of IDD has mainly used three class incidents: KeyEvent, timer event, TCN protocol stack incident:
KeyEvent: when the user has key to press, after message circulation mechanism detects behind the KeyEvent, send message to the user program window, this window checks which child control is this incident belong to, if detect suitable control, program will be called the call back function of this control, and this incident is handled.Such as in this program, when the user pressed the F1 key, program jumped to main interface, and when the user presses the F2 key, then program jumps to socket.
Timer event: timer event is mainly used to more new data, and the concrete time can decide according to needs.In the data of this program setting on 0.5s renewal interface.
TCN protocol stack incident: take place as TCN protocol stack incident (mainly being to receive message data), program will be called correlation function and carry out event handling, obtaining MVB message data, and carry out respective handling, as warning, echo message, display message etc. according to the content of message data.
The invention has the advantages that: because the present invention adopts a CPU board to implement control and treatment, the processing of all control sections of entire I DD device (comprise show and communicate by letter) is placed on the CPU entirely to be finished, and employing built-in Linux operating system, IDD device response therefore of the present invention is fast, the real-time height, equipment volume is less, can fully satisfy the various kinds of vehicles of correlation standard, the operational environment of train, is very suitable for railway territory.
Description of drawings
Fig. 1 is the theory diagram of documents 1;
Fig. 2 is the theory diagram of documents 2;
Fig. 3 is a system global structure block diagram of the present invention;
Fig. 4 is a signal topological diagram in the CPU board plate of the present invention;
Fig. 5 is a CPU board power principle block diagram of the present invention;
Fig. 6 is a base plate MVB subsystem theory diagram of the present invention;
Fig. 7 is a software architecture diagram of the present invention;
Fig. 8 is a program flow diagram of the present invention.
Among the figure: 1, MVBC address bus; 2, processor data bus; 3, processor address bus; 4, processor control bus.
Embodiment
Accompanying drawing has provided a specific embodiment of the present invention, and the invention will be further described below in conjunction with drawings and Examples.
Main design of the present invention is to effectively integrate resource, adopts the way of facilitation that the structure of entire I DD device is further dwindled, and the utilance of device further improves.
From accompanying drawing as can be seen the present invention be a kind of be used to show various device and the various information relevant on the train with train operation, and, comprise shell, CPU board, interface board, LCD display system at least for the operator provides IDD device with the interface of various device interactive information and data.Can also increase touch-screen, IC-card seat according to the needs of practical application.Whole device has only a CPU board, the processing of all control sections of IDD device (comprise show and communicate by letter) is placed on the CPU finishes, promptly use a CPU to finish demonstration and the TCN network communicating function of IDD, the circuit board of described IDD device comprises a CPU board and two parts of an interface board, and connects by two rectangular receptacle.Simultaneously described IDD device adopts built-in Linux operating system, realizes embedded type GUI (graphical user interface) and TCN (Train Control network) real-time protocol (RTP) packet function.Wherein:
Described CPU board is the core component of whole system, and the major control function of whole system is all finished by a CPU board.Therefore CPU board is to select the Xscale processor P XA255 of Intel Company for use, and operating frequency is 400MHz.Fig. 3 is the interior signal topological diagram of the CPU board plate of one embodiment of the invention, from accompanying drawing as can be seen, mainly comprise 32M Flash memory, 64M SDRAM memory, a USB Host interface, a touch screen interface, an Ethernet interface, an AC97 audio system on the CPU board, use a slice XC9536XL CPLD to finish the plate controlled function.CPU board adopts the DC5V power supply, is provided by interface board, is connected to CPU board by rectangular receptacle, and the design (calculated) load of DC5V is 1.5A.The TPS75733 chip is 3.3V with the 5V power source conversion, and for most of circuit of CPU board provides power supply, its capacity is 3A.The MIC5219BM5 chip is 1.37V with the 3.3V voltage transitions, for CPU provides core voltage.MIC2026-1BM mains switch chip is by software control, for the LCD liquid crystal display screen provides working power.System reset is controlled by MAX823E, comprises three reset source: electrification reset, hand-reset, watchdog reset.The hand-reset signal is connected on the interface board by 40 core sockets; Watchdog reset is controlled by GPIO6, and refresh time is 0.9-2.5 second, does not reset if do not use to guard the gate, and R51 (the WDI pin that is about to reset controller is unsettled) then should be installed.FLASH comprises BOOT ROM and user data area, is made up of two 16 FLASH chip (28F128J3C150), uses the CS0 address space, can be configured to 32M (28F128) or 64M (28F256).If use 28F128, then A25 receives the NC of chip.SDRAM can operating speed be that 10ns is above, highway width is 16 128Mb or 256Mb chip.USB Host interface control chip is CY7C67300, supports USB low speed and full speed pattern.The power supply of USB interface is provided by a slice MIC2026-1BM chip by the DC5V power supply.USB power supply ground and systematically between and be added with magnetic bead on the usb data line, to satisfy the EMC requirement.USB interface is connected on the USB Tpye A standard socket on the protecgulum by 4 core rectangular receptacle.USB Host interface takies the CS3 address space.Use the CS4297A chip as Audio Codec, provide control signal by processor.Simulated audio signal is connected on the interface board by 40 core rectangular receptacle, and the maximum effective value of signal is 1V (RMS), and load impedance should be greater than 10K Ω.When needs use audio system, need on interface board integrated amplifier circuit as required.Audio system takies GPIO28-GPIO31.Use ADS7843 as touch screen controller, can drive 4 wire resistance type touch-screens.Touch screen controller takies GPIO1, GPIO4, GPIO5.Use CS8900A as ethernet controller, ST7011 is an isolating transformer.Ethernet takies the CS1 address space.Use a slice XC9536XL CPLD chip to finish the control of plate level, comprise the output of address decoding, internal circuit logic and latch, the distribution etc. of resource in the plate.The LCD interface is supported 16bit TFT LCD, STN LCD etc., adopts the output of TTL numeral VGA signal, and supply voltage is 3.3V.
Described interface board mainly comprises parts such as communication interface MVB, power-supply system, peripheral hardware control circuit.The backlight electric power and the control circuit of LCD liquid crystal display screen also are installed on the interface board.The MVB subsystem is MVB 3 kind equipments of employing MVBC01 asic chip, MCM=2 (32K Traffic Memory), and physical layer adopts the ESD+ interface, and its structure is as shown in Figure 4.The MVB subsystem is realized the physical layer and the data link layer of MVB agreement, and the initialization of MVBC01, configuration and TCN Real-time Transport Protocol network are realized by CPU board software.CPLD finishes interface logic and the MVBC01 sequencing control with processor.The MVB subsystem takies the CS5 address space, uses the interruption input of GPIO9 as the MVBC01 chip.In the (SuSE) Linux OS kernel, realize the driving that MVB message data is relevant; The CS5 address space that directly TM is mapped to CPU is realized the communication of MVB process data.Power-supply system is input as direct current 110V.Power module VI-J00 finishes the conversion of 110V to 5V, and capacity is 50W; The LDS12-5S12 module is converted to 12V with 5V, and to the radiator fan power supply, capacity is 15W.Power line filter DNF214B3-03 is housed on 110 incoming lines, and the VI-J00 modular design has surge protection circuit.Two LCD back light inverter CXA-L10A are housed on the interface board, are used for the backlight power supply of LCD liquid crystal display screen.The LM3940IMP-3.3 chip is 3.3V with the 5V power source conversion, gives 3.3V chip power supply in the plate.The peripheral hardware control circuit all passes through the I2C bus and is connected with CPU board, comprises keyboard, temperature monitoring and fan control, real time clock circuit.Keyboard: keyboard circuit is realized by 16 road IO chip PCA9555D of I2C interface, adopts scan mode, is 3 * 7 the tunnel at present.Monitoring temperature: the monitoring temperature chip AD7416AR by the I2C interface realizes, drives radiator fan work by metal-oxide-semiconductor FDV303N.Real-time clock: the real-time timepiece chip PCF8563T by the I2C interface realizes that 3V lithium battery and BAT54C chip are used for the saved system time after system's power down.
Described LCD display system adopts built-in Linux operating system.The kernel version is 2.4.18.The LCD display system comprises LCD liquid crystal display screen and some control buttons, and the LCD liquid crystal display screen is installed on the protecgulum, is driven by CPU board to show.The major function of display is man-machine interface, and the another one key component of all displays software systems is graphical user interface (GUI).The GUI of system's employing at present is Tiny X, uses and writes application program based on the graphic programming instrument of FLTK.
A kind of be used to show various device and the various information relevant on the train of the present invention with train operation, and be: the processing mode that adopts facilitation for the operator provides the control method with the IDD device of the interface of various device interactive information and data, implement control and treatment with a CPU board, the processing of all control sections of IDD device (comprise show and communicate by letter) is placed on the CPU finishes, promptly use a CPU to finish demonstration and the TCN network communicating function of IDD, adopt built-in Linux operating system simultaneously, realize embedded type GUI (graphical user interface) and TCN (Train Control network) real-time protocol (RTP) packet function.Entire I DD system control program flow process is as follows:
At first, program is carried out initialization to Chinese font, can be set to 16 dot matrix or 24 raster fonts as required.Then MVB is configured, comprises device address, process data port initialization, message data port initialization, message queue configuration; Configuration to the TCN protocol stack comprises routing configuration, function number configuration etc.; Program also needs to be provided with the startup of radiator fan and stops temperature.User program has used the notion of control, and elements all on the interface all are controls, to the programmer, can set up graphic user interface as playing with building blocks, and can well realize separating of bed boundary and bottom data.User program comprises several windows, and each window all is placed with related content, and program is at first carried out initialization to the content and the form at the interface of each window.User program adopts event-driven structure, and the flow process of program is not to have only the serial of an inlet and several outlets to carry out circuit; On the contrary, program can be in a recurrent state always, in this circulation, program constantly from the outside or inside obtain some incident, such as user's button, the reception of PORT COM data etc., make certain reaction according to these incidents then, and finish certain function, this circulation receives till certain withdraws from message circulation up to program.The user program of IDD has mainly used three class incidents: KeyEvent, timer event, TCN protocol stack incident:
KeyEvent: when the user has key to press, after message circulation mechanism detects behind the KeyEvent, send message to the user program window, this window checks which child control is this incident belong to, if detect suitable control, program will be called the call back function of this control, and this incident is handled.Such as in this program, when the user pressed the F1 key, program jumped to main interface, and when the user presses the F2 key, then program jumps to socket.
Timer event: timer event is mainly used to more new data, and the concrete time can decide according to needs.In the data of this program setting on 0.5s renewal interface.
TCN protocol stack incident: take place as TCN protocol stack incident (mainly being to receive message data), program will be called correlation function and carry out event handling, obtaining MVB message data, and carry out respective handling, as warning, echo message, display message etc. according to the content of message data.
Claims (9)
1. based on the locomotive digital network interconnection equipment of embedded OS, comprise shell, CPU board, interface board, LCD display system, it is characterized in that: entire I DD device has only a CPU board, promptly uses a CPU to finish demonstration and the TCN network communicating function of IDD; The circuit board of described IDD device comprises a CPU board and two parts of an interface board, and connects by two rectangular receptacle; Described IDD device adopts built-in Linux operating system, realizes embedded type GUI (graphical user interface) and TCN (Train Control network) real-time protocol (RTP) packet function.
2. locomotive digital network interconnection equipment as claimed in claim 1 is characterized in that: described IDD device also has touch-screen, IC-card seat.
3. locomotive digital network interconnection equipment as claimed in claim 1, it is characterized in that: comprise Flash memory, SDRAM memory, a USB Host interface, a touch screen interface, an Ethernet interface, an audio system on the described CPU board, the power supply of CPU board is provided by interface board, is connected to CPU board by rectangular receptacle; CPU board system reset is controlled by reset controller, comprises three reset source: electrification reset, hand-reset, watchdog reset; The FLASH of CPU board comprises BOOT ROM and user data area; USB Host interface is supported USB low speed and full speed pattern; Audio system provides control signal by processor, and simulated audio signal is connected on the interface board by rectangular receptacle.
4. locomotive digital network interconnection equipment as claimed in claim 3 is characterized in that: described CPU board uses piece of CPLD to finish the plate controlled function, comprise address decoding, internal circuit logic and latch, the distribution of resource in the plate; Described USBHost interface is connected on the standard socket on the protecgulum by rectangular receptacle, and the maximum effective value of signal (RMS) is 1V, and load impedance is greater than 10K Ω.
5. locomotive digital network interconnection equipment as claimed in claim 1, it is characterized in that: described interface board comprises communication interface MVB (multifunction vehicle bus), power-supply system, peripheral hardware control circuit part, and the backlight electric power of LCD liquid crystal display screen and control circuit also are installed on the interface board; Wherein, the MVB subsystem adopts the MVBC01 asic chip, and physical layer adopts the ESD+ interface; The MVB subsystem is realized the physical layer and the data link layer of MVB agreement; The initialization of MVB, configuration and TCN Real-time Transport Protocol network are realized by CPU board software; CPLD finishes the interface logic and the MVB sequencing control of processor; In the (SuSE) Linux OS kernel, realize the driving that MVB message data is relevant; The address space that directly TM is mapped to CPU is realized the communication of MVB process data; Two LCD back light inverters are housed on interface board, are used for the backlight power supply of LCD liquid crystal display screen.
6. locomotive digital network interconnection equipment as claimed in claim 1, it is characterized in that: described LCD display system adopts built-in Linux operating system, the LCD display system comprises LCD liquid crystal display screen and some control buttons, and the LCD liquid crystal display screen is installed on the protecgulum, is driven by CPU board to show; The function of display is man-machine interface, and the graphical user interface of all displays software systems adopts Tiny X interface, uses and writes application program based on the graphic programming instrument of FLTK.
7. the control method of locomotive digital network interconnection equipment according to claim 1, be used to show various device and the various information relevant on the train with train operation, and provide interface with various device interactive information and data for the operator, it is characterized in that: the processing mode that adopts facilitation, implement control and treatment with a CPU board, the IDD device comprised show to be placed on the CPU and finish with all control sections processing of communicate by letter, promptly use a CPU to finish demonstration and the TCN network communicating function of IDD, adopt built-in Linux operating system simultaneously, realize embedded type GUI (graphical user interface) and TCN (Train Control network) real-time protocol (RTP) packet function.
8. as the control method of locomotive digital network interconnection equipment as described in the claim 7, it is characterized in that: entire I DD system control program flow process is as follows: at first, program is carried out initialization to Chinese font, is set to 16 dot matrix or 24 raster fonts as required; Then MVB is configured, comprises device address, process data port initialization, message data port initialization, message queue configuration; Configuration to the TCN protocol stack comprises routing configuration, function number configuration; Program also needs to be provided with the startup of radiator fan and stops temperature; User program has used the notion of control, and elements all on the interface all are controls, to the programmer, can set up graphic user interface as playing with building blocks, and can well realize separating of bed boundary and bottom data; User program comprises several windows, and each window all is placed with related content, and program is at first carried out initialization to the content and the form at the interface of each window; User program adopts event-driven structure, and program can be in a recurrent state always, in this circulation, program constantly from the outside or inside obtain data, react according to these data then, and finish certain function, this circulation up to program receive withdraw from message circulation till; The user program of IDD has used three class incidents: KeyEvent, timer event, TCN protocol stack incident.
9. as the control method of locomotive digital network interconnection equipment as described in the claim 8, it is characterized in that: described KeyEvent is: when the user has key to press, after message circulation mechanism detects KeyEvent, send message to the user program window, this window checks which child control is this incident belong to, if detect suitable control, program will be called the call back function of this control, and this incident is handled; Described timer event is: timer event is used for more new data, and the concrete time decides according to needs; Described TCN protocol stack incident is: take place as TCN protocol stack incident, program will be called correlation function and carry out event handling, obtaining MVB message data, and carry out respective handling according to the content of message data.
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| CN102602253A (en) * | 2011-12-22 | 2012-07-25 | 中国北车集团大连机车研究所有限公司 | Driver display unit of electric locomotive |
| CN103281226B (en) * | 2013-06-09 | 2017-03-29 | 南车株洲电力机车研究所有限公司 | A kind of MVB device address configuration system and method based on TCN |
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| CN105835906B (en) * | 2016-05-31 | 2018-02-09 | 中国铁道科学研究院 | A kind of train network system display device and train network system method for information display |
| CN105842572B (en) * | 2016-06-12 | 2019-02-05 | 重庆金美通信有限责任公司 | A kind of portable general comprehensive detector |
| CN108540364A (en) * | 2018-03-17 | 2018-09-14 | 王健 | A kind of decoding of MVB bus data and collection method based on CPLD technologies |
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| CN2727849Y (en) * | 2004-07-15 | 2005-09-21 | 株洲时代集团公司 | Digital display of monitoring apparatus |
-
2006
- 2006-05-09 CN CNB2006100316175A patent/CN100425031C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296581A (en) * | 1998-02-06 | 2001-05-23 | 微形产品设计投资公司 | Thermally efficient portable computer incorporating deploying CPU module |
| CN2340025Y (en) * | 1998-09-03 | 1999-09-22 | 机械工业部上海工业自动化仪表研究所 | Multifunction taxi-meter |
| CN1495585A (en) * | 2002-09-20 | 2004-05-12 | ض� | Method for defining CPU operation factor regardless of operation system and system |
| CN2661527Y (en) * | 2003-12-23 | 2004-12-08 | 株洲时代集团公司 | Novel screen display of train monitoring device |
| CN2727849Y (en) * | 2004-07-15 | 2005-09-21 | 株洲时代集团公司 | Digital display of monitoring apparatus |
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| CN1848786A (en) | 2006-10-18 |
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Address after: The age of 412001 in Hunan Province, Zhuzhou Shifeng District Road No. 169 Patentee after: ZHUZHOU CRRC TIMES ELECTRIC Co.,Ltd. Address before: 412007 Hunan Province, Zhuzhou Shifeng District Tian Xin North Gate Patentee before: ZHUZHOU CSR TIMES ELECTRIC Co.,Ltd. |
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