CN210693918U - M-Bus wireless communication module and meter - Google Patents
M-Bus wireless communication module and meter Download PDFInfo
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- CN210693918U CN210693918U CN201921729301.2U CN201921729301U CN210693918U CN 210693918 U CN210693918 U CN 210693918U CN 201921729301 U CN201921729301 U CN 201921729301U CN 210693918 U CN210693918 U CN 210693918U
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Abstract
The utility model provides a M-Bus wireless communication module and table meter relates to the thing networking field. Each unit integration in this M-Bus wireless communication module includes: the main chip is used for processing data transmitted and received by the radio frequency module and the Bluetooth module; the radio frequency module is used for receiving and transmitting data with a frequency band less than 1 GHz; the Bluetooth module is used for receiving and transmitting data of a Bluetooth protocol; the Bluetooth antenna is connected with the Bluetooth module and used for sending the received data to the Bluetooth module and sending the data provided by the Bluetooth module to the external equipment; and the radio frequency antenna interface is connected with the radio frequency module and is used for being connected with an external radio frequency antenna, so that the external radio frequency antenna can send the received data with the frequency band less than 1GHz to the radio frequency module and send the data provided by the radio frequency module to external equipment through the frequency band less than 1 GHz. Use the utility model discloses when configuring, upgrading and checking meter etc. operation to the meter, need not artifical contact meter and communication module, therefore more convenient, can reduce danger and reduce cost.
Description
Technical Field
The utility model relates to a thing networking field, in particular to M-Bus wireless communication module and table meter.
Background
Upgrading and configuration of current wireless meter reading module are mainly gone on through wired, and the on-the-spot installation environment of meter is complicated, because there is the lead sealing, and the on-the-spot uncapping of many meters can not realize almost, and what in addition hang on wire pole or wall, in being in complicated electric power network environment in addition, have certain danger, consequently at present when carrying out configuration, upgrading and the operation of checking meter etc. to the meter, very inconvenient, not only have danger but also consume a large amount of manpower and materials costs.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a M-Bus wireless communication module and meter, solve prior art and be not convenient enough problem when carrying out configuration, upgrading and the operation such as checking meter to the meter.
In order to solve the technical problem, the utility model adopts the following technical scheme:
an M-Bus wireless communication module, wherein units of the M-Bus wireless communication module are integrated, the M-Bus wireless communication module comprising:
the main chip is used for processing data transmitted and received by the radio frequency module and the Bluetooth module;
the radio frequency module is used for receiving and transmitting data with a frequency band less than 1 GHz;
the Bluetooth module is used for receiving and transmitting data of a Bluetooth protocol;
the Bluetooth antenna is connected with the Bluetooth module and used for sending the received data to the Bluetooth module and sending the data provided by the Bluetooth module to external equipment;
and the radio frequency antenna interface is connected with the radio frequency module and is used for being connected with an external radio frequency antenna, so that the external radio frequency antenna can send the received data with the frequency band less than 1GHz to the radio frequency module and send the data provided by the radio frequency module to external equipment through the frequency band less than 1 GHz.
According to the utility model discloses an embodiment, M-Bus wireless communication module is located a printed circuit board.
According to an embodiment of the present invention, the radio frequency module and/or the bluetooth module are integrated in the main chip.
According to the utility model discloses an embodiment, the data that the frequency channel is less than 1GHz are the data based on the wireless agreement of checking meter, M-Bus wireless communication module still includes:
and the universal asynchronous transceiver interface is connected with the main chip and is used for being connected with a meter so as to send the data sent by the main chip to the meter or receive and send the data sent by the meter to the main chip.
According to the utility model discloses an embodiment, M-Bus wireless communication module still includes:
and the universal input/output port is connected with the main chip and is used for being connected with external equipment so as to receive signals from the external equipment or send signals provided by the main chip to the external equipment.
According to an embodiment of the present invention, the radio frequency module is integrated in the main chip, and the M-Bus wireless communication module further includes:
and the power amplifier is connected with the main chip, is used for being connected with the radio frequency antenna interface and is used for amplifying the signal provided by the radio frequency antenna interface to the main chip.
According to the utility model discloses an embodiment, M-Bus wireless communication module still includes:
and the I2C bus interface is connected with the main chip and is used for being connected with an external device so as to receive signals from the external device or send signals provided by the main chip to the external device.
A meter, comprising:
the metering unit is used for metering to obtain field data applied by the meter;
the processing unit is used for acquiring the field data and processing the field data so as to convert the field data into digital signal data;
and the universal asynchronous receiving and transmitting transmitter interface is used for being connected with the universal asynchronous receiving and transmitting transmitter interface of the M-Bus wireless communication module so as to transmit the digital signal data to the M-Bus wireless communication module.
A meter, comprising:
the metering unit is used for metering to obtain field data applied by the meter;
the processing unit is used for acquiring the field data and processing the field data so as to convert the field data into digital signal data;
and the Bluetooth unit is used for being connected with the Bluetooth module of the M-Bus wireless communication module so as to send the digital signal data to the M-Bus wireless communication module based on a Bluetooth protocol.
According to the above technical scheme, the utility model discloses following advantage and positive effect have at least:
the utility model provides a M-Bus wireless communication module and meter, each unit is integrated in an organic whole in the M-Bus wireless communication module, the main chip that can handle bluetooth data and frequency channel and be less than 1 GHz's data has been adopted, bluetooth antenna links to each other with bluetooth module, make M-Bus wireless communication module's main chip can communicate with external equipment through the mode of bluetooth, and can connect external antenna through the radio frequency antenna interface, utilize this external antenna can make M-Bus wireless communication module's main chip communicate with external equipment through the frequency channel that is less than 1 GHz. The utility model provides an M-Bus wireless communication module which has small volume, low power consumption and clear structure and can be applied to the scenes of the Internet of things such as meter reading and the like; because can communicate with external equipment through the frequency channel that is less than 1GHz and bluetooth two kinds of modes simultaneously, on the one hand, can carry out configuration and the upgrading to the meter through the mode of bluetooth, on the other hand, can carry out meter reading through the frequency channel that is less than 1GHz, carry out configuration, upgrading and the operation such as checking meter to the meter and all go on through wireless mode, need not direct contact meter and M-Bus wireless communication module, consequently greatly made things convenient for operations such as configuration, upgrading and checking meter to the meter, can greatly reduced danger and reduce the manpower and material resources cost of consumption.
Drawings
Fig. 1 is a block diagram of an M-Bus wireless communication module according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the embodiment of the present invention when the M-Bus wireless communication module is integrated on the printed circuit board.
The reference numerals of fig. 1 are explained as follows:
a 100-M-Bus wireless communication module; 110-a master chip; 120-a bluetooth module; 130-a radio frequency module; 140-a bluetooth antenna; 150-radio frequency antenna interface.
The reference numbers of fig. 2 are explained as follows:
a 200-M-Bus wireless communication module; 210-a master chip; 220-a bluetooth antenna; 230-a power management module; 240-radio frequency crystal oscillator; 250-main chip system crystal oscillator; a 260-Sub-1GHz radio frequency front end module; 270-external antenna placement interface.
And pin definition: 1,2,4,7,8,13,14,22-34,37,38, 40-ground; 18-21,35-36, 42-none; 3-module reset; 5-general purpose input/output port (GPIO port) or data pin of I2C bus interface; 6-a general purpose input/output port (GPIO port) or a clock pin of an I2C bus interface; 9,10, 11-supply voltage of power amplifier (2V-4.8V); 12,43-48,53,54, 55-general purpose input/output port (GPIO port); 15-download configuration port; 16-a receive pin of a first universal asynchronous receiver transmitter interface (first UART interface); 17-a transmit pin of a first universal asynchronous receiver transmitter interface (first UART interface); a 39-920MHz antenna interface; a power supply input pin of a 41-3.6V lithium battery; 49-flow control send Request (RTS) signal pin of second universal asynchronous receiver transmitter interface (second UART interface); 50-a flow control transmit enable (CTS) signal pin of a second universal asynchronous receiver transmitter interface (second UART interface); 51-a receive pin of a second universal asynchronous receiver transmitter interface (second UART interface); 52-transmit pin of second universal asynchronous receiver transmitter interface (second UART interface); 56-supply voltage of main chip (2V-3.3V).
Detailed Description
Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.
Referring to fig. 1, fig. 1 is a block diagram illustrating a structure of an M-Bus wireless communication module 100 according to the present embodiment. Referring to fig. 1, it can be seen that the units of the M-Bus wireless communication module 100 are integrated together, and the M-Bus wireless communication module 100 includes: the bluetooth module 120, the rf module 130, the bluetooth antenna 140 and the rf antenna interface 150, wherein the bluetooth module 120 and the rf module 130 are integrated inside the main chip 110. The bluetooth antenna 140 is connected to the bluetooth module 120, and can send the received data to the bluetooth module 120, or send the data provided by the bluetooth module 120 to an external device, where the data transmission and reception of the bluetooth antenna 140 and the bluetooth module 120 are usually performed according to the specification of a bluetooth protocol; the rf module 130 is connected to the rf antenna interface 150, the rf antenna interface 150 may be externally connected to an rf antenna, the externally connected rf antenna may receive data with a frequency band less than 1GHz (Sub-1GHz) from an external device and provide the data to the rf module 130 through the rf antenna interface 150, or may receive the data provided by the rf module 130 through the rf antenna interface 150 and transmit the data to the external device through the frequency band less than 1GHz (Sub-1GHz), and the data received and transmitted by the rf module 130, the rf antenna interface 150, and the externally connected rf antenna all conform to a certain Sub-1GHz bandwidth and narrow band communication protocol, for example, a 920MHz wireless meter reading protocol. In this embodiment, since the bluetooth module 120 and the rf module 130 are integrated inside the main chip 110, the overall power consumption can be reduced, and the size of the M-Bus wireless communication module can be reduced. As a variation of this embodiment, the bluetooth module 120 and/or the rf module 130 may be located outside the main chip 110, i.e., only one of the rf module 130 and the bluetooth module 120 is integrated in the main chip 110 or neither the rf module 130 nor the bluetooth module 120 is integrated in the main chip 110.
Various ways of integrating the units of the M-Bus wireless communication module together may be provided, for example, the M-Bus wireless communication module may be assembled on a Printed Circuit Board (PCB), and at this time, the bluetooth antenna 140 is a built-in antenna on the PCB.
In an embodiment of the present invention, the aforementioned frequency band less than 1GHz may be data based on a wireless meter reading protocol, and the M-Bus wireless communication module may further include: a universal asynchronous Receiver/Transmitter (UART) interface connected to the main chip for connecting to the meter to transmit data from the main chip to the meter or to receive and transmit data from the meter to the main chip. The meter can be an electric meter, a water meter and other Internet of things equipment, a UART interface of the M-Bus wireless communication module can collect field data of the electric meter, the water meter and other Internet of things equipment, and tasks such as parameter configuration and system upgrading can be performed on the electric meter, the water meter and other Internet of things equipment.
In an embodiment of the present invention, the M-Bus wireless communication module may further include: a General-purpose input/output (GPIO) port or an I2C Bus interface, which can be connected to a main chip for connecting to an external device, so as to implement communication between the M-Bus wireless communication module and the external device. Specifically, the GPIO port, I2C bus interface, may receive signals from an external device or send signals provided by the main chip to an external device. By arranging the GPIO port and/or the I2C Bus interface, the function of the M-Bus wireless communication module can be further enriched, the convenience of communication with external equipment is improved, and communication with more external equipment is realized. The GPIO port and/or the I2C Bus interface can be used for being connected with a meter to receive field data of the meter, and can also be used for being connected with a handheld terminal such as a mobile phone to write data into the M-Bus wireless communication module or the meter connected with the M-Bus wireless communication module.
In an embodiment of the present invention, the radio frequency module is integrated in the main chip, and the M-Bus wireless communication module may further include: a Power Amplifier (PA) connected to the main chip, configured to connect to the rf antenna interface, and configured to amplify a signal provided by the main chip to the rf antenna interface. As a variation of this embodiment, the M-Bus wireless communication module may further include: and the Low Noise Amplifier (LNA) is connected with the radio frequency antenna interface, is used for being connected with the main chip, and is used for amplifying the signal provided by the radio frequency antenna interface to the main chip, so that the signal-to-noise ratio of the signal provided to the main chip can be reduced, and the Low noise amplifier and the power amplifier both belong to a Sub-1GHz radio frequency front-end module.
Specifically, please refer to fig. 2, which shows a schematic diagram of the M-Bus wireless communication module integrated on the printed circuit board according to an embodiment of the present invention. In fig. 2, the M-Bus wireless communication module 200 mainly includes: the main chip 210, the bluetooth antenna 220, the power management module 230, the radio frequency crystal oscillator 240, the main chip system crystal oscillator 250, the Sub-1GHz radio frequency front end module 260, and the external antenna installation interface 270, wherein the main chip 210 integrates the radio frequency module and the bluetooth module, and the radio frequency module can be used for receiving and transmitting data with a frequency band less than 1GHz (Sub-1GHz), so that the main chip is a dual-band Micro Control Unit (MCU). Other units or modules such as a Read-Only Memory (Read-Only Memory) and a Flash Memory (Flash Memory) may also be integrated in the main chip 210. Bluetooth antenna 220 may be a 2.4GHz antenna supporting the bluetooth protocol. The power management module 230 is used to supply power to the main chip 210. A Radio Frequency (RF) crystal 240 may provide base frequencies for the RF module and the bluetooth module, respectively, and the Frequency may be 32 MHz. The frequency of the main chip system crystal oscillator 250 may be 32.768kHz for driving the main chip 210 to operate. The Sub-1GHz radio frequency front end module 260 may include a power amplifier and a low noise amplifier. The rf antenna interface of the M-Bus wireless communication module 200 is a pin 39, which is an antenna interface of 920MHz, and after the external rf antenna is connected to the pin 39, it can be placed on the external antenna mounting interface 270 for fixing. The power management module 230 can respectively provide power for the main chip 210 and the Sub-1GHz rf front-end module 260, wherein the Sub-1GHz rf front-end module 260 can be provided with a 2V-4.8V power supply voltage through the pins 9-11, the main chip 210 can be provided with a 2V-3.3V power supply voltage through the pin 56, and the lithium battery access pin 41 can provide a 3.6V power supply voltage for the whole M-Bus wireless communication module. The pin 15 is a download configuration port, and can receive an external signal to provide configuration data for the main chip 210. The embodiment of the utility model provides an in M-Bus wireless communication module can provide output for 20 dBm's bluetooth signal and output for 30 dBm's Sub-1GHz radio frequency signal.
In order to cooperate with the utility model provides an M-Bus wireless communication module, the utility model also provides a meter.
A meter, comprising:
the metering unit is used for metering to obtain field data applied by the meter;
the processing unit is used for acquiring the field data and processing the field data so as to convert the field data into digital signal data;
and the Bluetooth unit is used for being connected with the Bluetooth module of the M-Bus wireless communication module so as to send the digital signal data to the M-Bus wireless communication module based on a Bluetooth protocol.
In order to with the utility model provides a M-Bus wireless communication module who possesses general asynchronous receiving and dispatching transmitter interface cooperatees, the utility model also provides another kind of table meter, this table meter can include M-Bus wireless communication module, also can be independent of outside M-Bus wireless communication module.
A meter, comprising:
the metering unit is used for metering to obtain field data applied by the meter;
the processing unit is used for acquiring the field data and processing the field data so as to convert the field data into digital signal data;
and the universal asynchronous receiving and transmitting transmitter interface is used for being connected with the universal asynchronous receiving and transmitting transmitter interface of the M-Bus wireless communication module so as to transmit the digital signal data to the M-Bus wireless communication module.
In order to make those skilled in the art more understand the general application of the M-Bus wireless communication module provided by the present invention, the following description will be made in detail.
The first method is as follows: the M-Bus wireless communication module is installed on a meter reading field, a Universal Asynchronous Receiver Transmitter (UART) interface of the M-Bus wireless communication module is connected with a meter, data of the meter can be acquired, Sub-1GHz radio frequency signal data is provided for a workstation or a data center through a radio frequency module and a radio frequency antenna interface, the acquired meter data can be sent to the workstation or the data center, and communication is carried out with a Bluetooth module and a Bluetooth antenna of the M-Bus wireless communication module through a handheld terminal (such as a smart phone), so that configuration and firmware upgrading of the meter and/or the M-Bus wireless communication module can be achieved.
The second method comprises the following steps: the M-Bus wireless communication module is installed on a meter reading site, a GPIO interface or an I2C Bus interface of the M-Bus wireless communication module is connected with a meter, data of the meter can be acquired, Sub-1GHz radio frequency signal data is provided for a workstation or a data center through a radio frequency module and a radio frequency antenna interface, the acquired meter data can be sent to the workstation or the data center, and a handheld terminal (such as a smart phone) is communicated with a Bluetooth module and a Bluetooth antenna of the M-Bus wireless communication module, so that configuration and firmware upgrade of the meter and/or the M-Bus wireless communication module can be achieved.
The third method comprises the following steps: the M-Bus wireless communication module is installed on a meter reading field, a Bluetooth module and a Bluetooth interface of the M-Bus wireless communication module are in wireless connection with a meter, data of the meter can be acquired, Sub-1GHz radio frequency signal data are provided for a workstation or a data center through the radio frequency module and the radio frequency antenna interface, the acquired meter data can be sent to the workstation or the data center, and a handheld terminal (such as a smart phone) is communicated with the Bluetooth module and the Bluetooth antenna of the M-Bus wireless communication module, so that configuration and firmware upgrading of the meter and/or the M-Bus wireless communication module can be achieved.
The method is as follows: the first M-Bus wireless communication module is installed in the handheld meter reading terminal, a second M-Bus wireless communication module which is in wired or wireless connection with a meter is arranged on a meter reading site, the second M-Bus wireless communication module can acquire data of the meter and then provides Sub-1GHz radio frequency signal data to the first M-Bus wireless communication module of the handheld meter reading terminal through a radio frequency module and a radio frequency antenna interface, so that the acquired data of the meter is sent to the handheld meter reading terminal, the handheld terminal (such as a smart phone) or the handheld meter reading terminal is communicated with a Bluetooth module and a Bluetooth antenna of the second M-Bus wireless communication module, and configuration and firmware upgrading of the meter and/or the second M-Bus wireless communication module can be achieved.
To sum up, the utility model provides a pair of M-Bus wireless communication module has following advantage and positive effect:
1. the structure is clear, small and stand-by power consumption is low, is applicable to the thing networking especially wireless scene of checking meter.
2. The main chip of the Bluetooth and Sub-1GHz dual-frequency bands is adopted, functions are comprehensive, application modes are multiple, and near-distance and far-distance communication can be achieved.
3. Because can communicate with external equipment through the frequency channel that is less than 1GHz and bluetooth two kinds of modes simultaneously, on the one hand, can carry out configuration and the upgrading to the meter through the mode of bluetooth, on the other hand, can carry out meter reading through the frequency channel that is less than 1GHz, carry out configuration, upgrading and the operation such as checking meter to the meter and all go on through wireless mode, need not direct contact meter and M-Bus wireless communication module, consequently greatly made things convenient for operations such as configuration, upgrading and checking meter to the meter, can greatly reduced danger and reduce the manpower and material resources cost of consumption.
4. The Bluetooth signal with the output power of 20dBm and the Sub-1GHz radio frequency signal with the output power of 30dBm can be provided, the signal is strong, and the communication performance is excellent.
5. A plurality of interfaces (such as a GPIO interface and a UART interface) for communicating with an external device are provided, which facilitates extension of functions.
While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (10)
1. An M-Bus wireless communication module, wherein units of the M-Bus wireless communication module are integrated, the M-Bus wireless communication module comprising:
the main chip is used for processing data transmitted and received by the radio frequency module and the Bluetooth module;
the radio frequency module is used for receiving and transmitting data with a frequency band less than 1 GHz;
the Bluetooth module is used for receiving and transmitting data of a Bluetooth protocol;
the Bluetooth antenna is connected with the Bluetooth module and used for sending the received data to the Bluetooth module and sending the data provided by the Bluetooth module to external equipment;
and the radio frequency antenna interface is connected with the radio frequency module and is used for being connected with an external radio frequency antenna, so that the external radio frequency antenna can send the received data with the frequency band less than 1GHz to the radio frequency module and send the data provided by the radio frequency module to external equipment through the frequency band less than 1 GHz.
2. The M-Bus wireless communication module of claim 1, wherein:
the M-Bus wireless communication module is positioned on a printed circuit board.
3. The M-Bus wireless communication module according to claim 1 or 2, wherein:
the radio frequency module and/or the Bluetooth module are/is integrated in the main chip.
4. The M-Bus wireless communication module according to claim 3, wherein the data with the frequency band less than 1GHz is data based on a wireless meter reading protocol, and the M-Bus wireless communication module further comprises:
and the universal asynchronous transceiver interface is connected with the main chip and is used for being connected with a meter so as to send the data sent by the main chip to the meter or receive and send the data sent by the meter to the main chip.
5. The M-Bus wireless communication module of claim 4, further comprising:
and the universal input/output port is connected with the main chip and is used for being connected with external equipment so as to receive signals from the external equipment or send signals provided by the main chip to the external equipment.
6. The M-Bus wireless communication module of claim 5, wherein the radio frequency module is integrated within the primary chip, the M-Bus wireless communication module further comprising:
and the power amplifier is connected with the main chip, is used for being connected with the radio frequency antenna interface and is used for amplifying the signal provided by the main chip to the radio frequency antenna interface.
7. The M-Bus wireless communication module of claim 5, further comprising:
and the low-noise amplifier is connected with the radio frequency antenna interface, is used for being connected with the main chip and is used for amplifying the signal provided by the radio frequency antenna interface to the main chip.
8. The M-Bus wireless communication module of claim 5, further comprising:
and the I2C bus interface is connected with the main chip and is used for being connected with an external device so as to receive signals from the external device or send signals provided by the main chip to the external device.
9. A meter, comprising:
the metering unit is used for metering to obtain field data applied by the meter;
the processing unit is used for acquiring the field data and processing the field data so as to convert the field data into digital signal data;
a universal asynchronous receiver transmitter interface for connection with the universal asynchronous receiver transmitter interface of the M-Bus wireless communication module of claim 4 for transmitting the digital signal data to the M-Bus wireless communication module.
10. A meter, comprising:
the metering unit is used for metering to obtain field data applied by the meter;
the processing unit is used for acquiring the field data and processing the field data so as to convert the field data into digital signal data;
a bluetooth unit for connecting with the bluetooth module of the M-Bus wireless communication module of any one of claims 1 to 8 to transmit the digital signal data to the M-Bus wireless communication module based on a bluetooth protocol.
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| CN201921729301.2U CN210693918U (en) | 2019-10-15 | 2019-10-15 | M-Bus wireless communication module and meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113242614A (en) * | 2021-05-24 | 2021-08-10 | 慧感(上海)物联网科技有限公司 | Wireless ad hoc network system for complex pipe network environment and networking method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113242614A (en) * | 2021-05-24 | 2021-08-10 | 慧感(上海)物联网科技有限公司 | Wireless ad hoc network system for complex pipe network environment and networking method thereof |
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Address after: 611731 No. 99, Tianquan Road, high tech Zone, Chengdu, Sichuan Patentee after: CHENGDU GREAT WALL DEVELOPMENT TECHNOLOGY Co.,Ltd. Address before: 611731 no.1218, Hezuo Road, high tech Zone (West District), Chengdu, Sichuan Province Patentee before: CHENGDU GREAT WALL DEVELOPMENT TECHNOLOGY Co.,Ltd. |
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Address after: 611731 No. 99, Tianquan Road, high tech Zone, Chengdu, Sichuan Patentee after: Chengdu Great Wall Development Technology Co.,Ltd. Address before: 611731 No. 99, Tianquan Road, high tech Zone, Chengdu, Sichuan Patentee before: CHENGDU GREAT WALL DEVELOPMENT TECHNOLOGY Co.,Ltd. |