CN107278075B - DTU box for Internet of things - Google Patents
DTU box for Internet of things Download PDFInfo
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- CN107278075B CN107278075B CN201710647982.7A CN201710647982A CN107278075B CN 107278075 B CN107278075 B CN 107278075B CN 201710647982 A CN201710647982 A CN 201710647982A CN 107278075 B CN107278075 B CN 107278075B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
- H05K5/0217—Mechanical details of casings
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Abstract
The invention discloses a DTU box for the Internet of things, which comprises an upper cover, a lower cover, a terminal port, a plate body, a power module, a low-power-consumption power switching module and a serial port level conversion module, wherein the lower cover consists of a bottom plate, a first lower side plate, a second lower side plate and a third lower side plate, the upper cover covers the lower cover, the upper cover consists of a top plate, a first upper side plate, a second upper side plate and a fixing plate, the plate body is fixed on a fixing column, a plurality of connecting terminals matched with the terminal port are fixed on the plate body, and the power module, the low-power-consumption power switching module and the serial port level conversion module which are sequentially connected are fixed on the plate body. The fixing column is fixed on the bottom plate, so that the plate body can be better fixed, and the use is convenient.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of Internet of things, in particular to the technical field of DTU iron shells.
[ background ] A method for producing a semiconductor device
The internet of things is an emerging concept, and to realize that the internet of things needs a large amount of data for support, various data receiving, sending, processing and analyzing modules are inevitably needed, and the modules are often arranged in a shell. The existing shell is not ideal enough and can not meet the requirements well.
[ summary of the invention ]
The invention aims to solve the problems in the prior art, and provides a DTU box for the Internet of things, which can enable a DTU iron box to well meet the requirements.
In order to achieve the purpose, the invention provides a DTU box for the Internet of things, which comprises an upper cover, a lower cover, terminal ports, a plate body, a power module, a low-power-consumption power switching module and a serial port level conversion module, wherein the lower cover comprises a bottom plate, a first lower side plate, a second lower side plate and a third lower side plate, the bottom plate is rectangular, a plurality of fixing columns are arranged on the upper surface of the bottom plate, a first lower side plate is fixed on one short side of the bottom plate, a plurality of terminal ports are arranged on the first lower side plate, a plurality of second lower side plates and a plurality of third lower side plates are arranged on two long side sides of the bottom plate, a first fixing hole is arranged on the second lower side plate, the upper cover covers the lower cover, the upper cover comprises a top plate, a first upper side plate, a second upper side plate and a fixing plate, the top plate is rectangular, a plurality of terminal ports are arranged on the top plate, a first upper side plate is fixed on one short side of the top plate, the first upper side plate is provided with a plurality of terminal ports, the first upper side plate and the first lower side plate are positioned on different sides of the bottom plate, two long side sides of the top plate are respectively provided with a second upper side plate, the second upper side plate is provided with a second fixing hole matched with the first fixing hole, the bottom of the second upper side plate is fixed with a fixing plate, the fixing plate is provided with a plurality of main fixing holes, the plate body is fixed on a fixing column, the plate body is fixed with a plurality of connecting terminals matched with the terminal ports, the plate body is fixed with a power supply module, a low-power-consumption power supply switching module and a serial port level conversion module which are sequentially connected, the power supply module comprises a synchronous rectification regulator MP2303A, a No. 1 pin of the MP2303A is connected with a first annular circuit formed by sequentially connecting a diode D2, an inductor L1 and a capacitor C2, and a connecting point of the No. 1 pin and the first annular circuit is positioned between the D2 and the C2, the anode of D2 is connected with L1, the 2 pin of MP2303A is directly connected with the cathode of diode D1, the cathode of voltage-stabilizing diode Z1, resistor R4, capacitors C1, C5 and C6, the anodes of C1, C5, C6 and Z1 are all grounded, the anode of D1 is connected with bidirectional port, the 3 pin of MP2303A is connected with the first loop circuit, the connection point of 3 pin and first loop circuit is positioned between L1 and C2, the 4 pin of MP2303A is grounded, the 5 pin of MP2303A is directly connected with resistors R1 and R2, R2 is grounded, R1 is connected with output end, the output end is also directly connected with first loop circuit, capacitors C7 and C8, the connection point of output end and first loop circuit is positioned between L1 and D2, C7 and C8 are both grounded, the 6 pin of MP 3A is connected with capacitor C4, the other end of C4 is connected with a grounded resistor R3, the pin of MP 3A is connected with R7 and R5, R5 is grounded, the No. 8 pin of the MP2303A is connected with a grounded capacitor C3, the low-power-consumption power supply switching module comprises a triode Q1, the base of the Q1 is connected with a signal opening end GPIOEN, the emitter of the Q1 is connected with a low-power-consumption power supply VBAT1, the collector of the Q1 is directly connected with an external power supply, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14 and a capacitor C15, the capacitor C11, the capacitor C12, the capacitor C13, the capacitor C14 and the capacitor C15 are all grounded, the serial port level conversion module is connected with a VCC1 system and a VCC2 system, the VCC2 system is directly connected with resistors R21 and R22, the resistor R21 is directly connected with the capacitor C21, the anode of a diode D21 and a first receiving end RXD1, the C21 is grounded, the cathode of the D21 is connected with a second transmitting end TXD2, the R22 is directly connected with the base of the capacitor C22 and the triode Q2, the emitter of the Q22 is connected with the first transmitting end RXD1, the resistor TXD 23, r23 is directly connected with a collector of Q2 and a second receiving end RXD2
Preferably, the first lower side plate, the second lower side plate and the third lower side plate are all located on the upper surface of the bottom plate, and the first upper side plate and the second upper side plate are all located on the lower surface of the top plate.
Preferably, the terminal openings on the first lower side plate, the first upper side plate and the top plate are circular or rectangular, and the sizes and shapes of different terminal openings can be different.
Preferably, the fixing plate is provided with a bayonet which is in a gourd shape.
Preferably, the capacitors C1, C6, C7, C14 and C15 are electrolytic capacitors.
Preferably, the OUTPUT voltage in the power supply module is OUTPUT = R1+ R2/R2 × 0.8V.
Preferably, the level of the VCC1 system is always greater than the level of the VCC2 system.
The invention has the beneficial effects that: the fixing column is fixed on the bottom plate, so that the plate body can be better fixed, and the use is convenient; the arrangement of the first fixing hole and the second fixing hole enables the upper cover and the lower cover to be positioned more easily; the voltage stabilizing diode Z1 is arranged on the power supply module, so that the protection circuit becomes relatively simple, the cost can be reduced, and the volume can be reduced; the low-power-consumption power supply switching module is arranged to enable the low-power-consumption mode to be automatically switched when the external power supply disappears, so that the energy consumption is less, and the modes of discharging, charging and the like can be controlled; the serial port level conversion module can realize serial port communication of different levels through circuit configuration.
The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.
[ description of the drawings ]
Fig. 1 is a front view of a DTU box for the internet of things according to the present invention;
fig. 2 is an exploded view of a DTU box for the internet of things according to the present invention;
fig. 3 is a schematic plate body diagram of a DTU box for the internet of things according to the present invention;
fig. 4 is a circuit diagram of a power module of the DTU box for the internet of things according to the present invention;
fig. 5 is a circuit diagram of a low-power consumption power switching module of the DTU box for the internet of things according to the present invention;
fig. 6 is a circuit diagram of a serial port level conversion module of the DTU box for the internet of things.
In the figure: the power supply comprises a base plate 1, a top plate 2, a top plate 3, a plate body 4, a power supply module 5, a low-power-consumption power supply switching module 6, a serial port level conversion module 11, a first lower side plate 12, a second lower side plate 13, a third lower side plate 15, a first fixing hole 15, a fixing column 19, a terminal port 20, a first upper side plate 21, a second upper side plate 22, a fixing plate 23, a second fixing hole 25, a main fixing hole 16 and a bayonet 17.
[ detailed description ] A
Referring to fig. 1-6, the DTU box for the internet of things of the present invention comprises an upper cover, a lower cover, a terminal port 20, a plate body 3, a power module, a low power consumption power switching module, and a serial port level conversion module, wherein the lower cover comprises a bottom plate 1, a first lower side plate 11, a second lower side plate 12, and a third lower side plate 13, the bottom plate 1 is rectangular, the upper surface of the bottom plate 1 is provided with a plurality of fixing posts 19, a short side of the bottom plate 1 is fixed with the first lower side plate 11, the first lower side plate 11 is provided with the plurality of terminal ports 20, two long side sides of the bottom plate 1 are provided with a plurality of second lower side plates 12 and a plurality of third lower side plates 13, the second lower side plates 12 are provided with first fixing holes 15, the upper cover covers the lower cover, the upper cover comprises a top plate 2, a first upper side plate 21, a second upper side plate 22, and a rectangular fixing plate 23, the top plate 2 is rectangular, the top plate 2 is provided with a plurality of terminal ports 20, a first upper side plate 21 is fixed on a short side of the top plate 2, a plurality of terminal ports 20 are arranged on the first upper side plate 21, the first upper side plate 21 and the first lower side plate 11 are located on different sides of the bottom plate 1, two long side sides of the top plate 2 are respectively provided with a second upper side plate 22, the second upper side plate 22 is provided with a second fixing hole 25 matched with the first fixing hole 15, the bottom of the second upper side plate 22 is fixed with a fixing plate 23, the fixing plate 23 is provided with a plurality of main fixing holes 16, the plate body 3 is fixed on the fixing column 19, the plate body 3 is fixed with a plurality of connecting terminals matched with the terminal ports 20, the plate body 3 is fixed with a power supply module 4, a low-power-consumption power supply switching module 5 and a serial port level conversion module 6 which are sequentially connected, the power supply module 2304 comprises a synchronous rectification regulator MP 3A, the No. 1 pin of the MP 3A is connected with a diode D2, the inductor L1 and the capacitor C2 are sequentially connected to form a first annular circuit, the connection point of a No. 1 pin and the first annular circuit is positioned between D2 and C2, the anode of D2 is connected with L1, a No. 2 pin of the MP2303A is directly connected with the cathode of a diode D1, the cathode of a voltage stabilizing diode Z1, a resistor R4, a capacitor C1, a resistor C5 and a capacitor C6, the anodes of C1, C5, C6 and Z1 are all grounded, the anode of D1 is connected with a bidirectional port, a No. 3 pin of the MP2303A is connected with the first annular circuit, the connection point of the No. 3 pin and the first annular circuit is positioned between L1 and C2, the No. 4 pin of the MP2303A is grounded, the No. 5 pin of the MP 3A is directly connected with the resistors R1 and R2, the R2 is grounded, the R1 is connected with an output end, the output end is also directly connected with the first annular circuit, the capacitors C7 and C8, and the connection point of the first annular circuit is positioned between L1 and D2, and the output end of the first annular circuit is grounded, the No. 6 pin of the MP2303A is connected with a capacitor C4, the other end of the C4 is connected with a grounded resistor R3, the No. 7 pin of the MP2303A is directly connected with the resistors R4 and R5, the R5 is grounded, the No. 8 pin of the MP2303A is connected with a grounded capacitor C3, the low-power-consumption power supply switching module 5 comprises a triode Q1, the base electrode of the Q1 is connected with a signal opening end GPIOEN, the emitter electrode of the Q1 is connected with a low-power-consumption power supply VBAT1, the collector electrode of the Q1 is directly connected with an external power supply, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14 and a capacitor C15, the capacitors C11 and C12, the capacitor C13, the capacitor C14 and the capacitor C15 are all grounded, the serial port level conversion module 6 is connected with a VCC1 system and a VCC2 system, the VCC2 system is directly connected with the resistors R21 and R22, the resistor R21 is directly connected with the capacitor C21, the anode of a diode D21 and the cathode of the first receiving end RXDD 1, the cathode of the diode D21 is connected with a second sending end of the diode D2, the circuit comprises a capacitor C22, a triode Q2, a resistor R23, a resistor R22, a resistor R23, a collector of the triode Q2 and a second receiving terminal RXD2, wherein the resistor R22 is directly connected with the base of the capacitor C22 and the base of the triode Q2, the base of the triode C22 is grounded, the emitter of the Q2 is connected with a first transmitting terminal TXD1, the VCC1 system is connected with the resistor R23, the resistor R23 is directly connected with the collector of the Q2 and the second receiving terminal RXD2, the first lower side plate 11, the second lower side plate 12 and the third lower side plate 13 are all located on the upper surface of the bottom plate 1, the first upper side plate 21 and the terminal ports 20 on the top plate 2 are circular or rectangular, the sizes and the shapes of different terminal ports 20 can be different, a bayonet 17 is arranged on the fixing plate 23, the bayonet 17 is in a gourd shape, the capacitors C1, C6, C7, C14 and C15 are electrolytic capacitors, the OUTPUT terminal voltage in the power supply module is OUTPUT = R1+ R2/R2.8V, and the level of the VCC1 system is always higher than the level of the VCC2 system.
The working process of the invention is as follows:
in the working process of the DTU box for the Internet of things, when the power module 4 works, the INPUT INPUTs 4.7V-28V direct current voltage, the D1 is rectified to obtain power supply voltage, the Z1 is used for protecting a voltage regulator tube in an overvoltage mode, when the voltage exceeds the threshold value of the voltage regulator tube, the voltage of the voltage regulator tube is stabilized at the threshold value, and a rear circuit is protected. C1, C5 and C6 capacitors for filtering and storing energy. The chip starts to operate, and the function of C3 is to set a soft start period of 15 MS. The three pins of the MP2303A ensure the continuity of output current by the output voltage through L1 inductive energy storage filtering, and finally the voltage output by the L1 is stored through C7 and C8, and the filtering is used by an external system. The voltage OUTPUT = (R1 + R2)/R2 0.8V of OUTPUT can be set by adjusting R1 and R2, undervoltage protection can be set by adjusting R4 and R5, and when the enabling voltage V = VCC/(R4 + R5) × R5 < 1.3V, the switching power supply stops working; when the low-power-consumption power supply switching module 5 works, when an external power supply supplies power, an external power supply VCC charges and filters a C11-C15 capacitor, a GPIOEN level is changed into a low level, Q1 is switched on, the VCC charges VBAT1 while charging the low-power-consumption chip, when the external power supply stops, the external power supply VCC disappears, the GPIOEN level disappears, at the moment, Q1 is switched off, VBAT1 supplies power to the low-power-consumption chip, but does not supply power to other systems, the low-power-consumption chip detects that a GPIOEN signal disappears, starts to stand by and enters a low-power-consumption mode; when the VCC2 system sends data to the VCC1 system, the serial port level conversion module 6 operates, TXD1 is to transmit data to RXD2, TXD is high level VCC2 when sending high level, at this time, because VBE =0 < 0.4V of the transistor Q1, the transistor is not turned on, the voltage of TXD2 = the pull-up voltage of VCC1, TXD is low level GND when sending low level, at this time, because VBE = > 0.4V of the transistor Q1, the transistor is turned on, RXD2 voltage = 0.4V of saturation voltage drop of VCC1-VCE ≈ the voltage of TXD, when the VCC1 system sends data to the VCC2 system, TXD2 is high level VCC when sending high level, TXD2 is TXD2 > VCC2, because VCC1 > VCC2, the diode is turned off in the reverse direction, the voltage of RXD = R1 pull-up voltage, when sending low level VCC D2 is VCC, VCC1 → VCC1, and RXD → voltage drop of the diode is turned on.
The above embodiments are illustrative of the present invention, and are not intended to limit the present invention, and any simple modifications of the present invention are within the scope of the present invention.
Claims (1)
1. The utility model provides a DTU box for thing networking which characterized in that: the power supply comprises an upper cover, a lower cover, terminal ports (20), a plate body (3), a power supply module, a low-power-consumption power supply switching module and a serial port level conversion module, wherein the lower cover comprises a bottom plate (1), a first lower side plate (11), a second lower side plate (12) and a third lower side plate (13), the bottom plate (1) is rectangular, a plurality of fixing columns (19) are arranged on the upper surface of the bottom plate (1), a first lower side plate (11) is fixed on one short side of the bottom plate (1), a plurality of terminal ports (20) are arranged on the first lower side plate (11), a plurality of second lower side plates (12) and a plurality of third lower side plates (13) are arranged on two long side sides of the bottom plate (1), a first fixing hole (15) is arranged on the second lower side plate (12), the upper cover is covered on the lower cover, the upper cover comprises a top plate (2), a first upper side plate (21), a second upper side plate (22) and a fixing plate (23), the top plate (2) is arranged on the top plate (2), a plurality of terminal ports (21) are arranged on one short side of the top plate (2), and the first lower side plate (21) and the two long side plates (11) are arranged on the bottom plate (11), a second fixing hole (25) matched with the first fixing hole (15) is formed in the second upper side plate (22), a fixing plate (23) is fixed at the bottom of the second upper side plate (22), a plurality of main fixing holes (16) are formed in the fixing plate (23), the plate body (3) is fixed on the fixing column (19), a plurality of connecting terminals matched with the terminal ports (20) are fixed on the plate body (3), a power supply module (4), a low-power-consumption power supply switching module (5) and a serial port level conversion module (6) which are sequentially connected are fixed on the plate body (3), the power supply module (4) comprises a synchronous rectification regulator MP2303A, a No. 1 pin of the MP2303A is connected with a first annular circuit formed by sequentially connecting a diode D2, an inductor L1 and a capacitor C2, and a connecting point of the No. 1 pin and the first annular circuit is located between the D2 and the C2, the anode of D2 is connected with L1, the 2 pin of MP2303A is directly connected with the cathode of diode D1, the cathode of voltage stabilizing diode Z1, resistor R4, capacitor C1, C5, C6, the anodes of C1, C5, C6 and Z1 are all grounded, the anode of D1 is connected with a bidirectional port, the 3 pin of MP2303A is connected with a first annular circuit, the connection point of the 3 pin and the first annular circuit is positioned between L1 and C2, the 4 pin of MP2303A is grounded, the 5 pin of MP2303A is directly connected with resistors R1 and R2, R2 is grounded, R1 is connected with an output end, the output end is also directly connected with the first annular circuit, capacitors C7 and C8, the connection point of the output end and the first annular circuit is positioned between L1 and D2, c7 and C8 are grounded, the pin No. 6 of the MP2303A is connected with a capacitor C4, the other end of the C4 is connected with a grounded resistor R3, the pin No. 7 of the MP2303A is directly connected with the resistors R4 and R5, the R5 is grounded, the pin No. 8 of the MP2303A is connected with a grounded capacitor C3, the low-power-consumption power supply switching module (5) comprises a triode Q1, the base electrode of the Q1 is connected with a signal opening end GPIOEN, the emitter electrode of the Q1 is connected with a low-power-consumption power supply VBAT1, the collector electrode of the Q1 is directly connected with an external power supply, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14 and a capacitor C15, the capacitor C11, the capacitor C12, the capacitor C13, the capacitor C14 and the capacitor C15 are all grounded, the serial port level conversion module (6) is connected with a VCC1 system and a VCC2 system, the VCC2 system is directly connected with the resistors R21 and R22, the resistor R21 is directly connected with a capacitor C21, the anode of a diode D21 and a first receiving terminal RXD1, the C21 is grounded, the cathode of the D21 is connected with a second transmitting terminal TXD2, the R22 is directly connected with the capacitor C22 and the base of a triode Q2, the C22 is grounded, the emitter of the Q2 is connected with the first transmitting terminal TXD1, the VCC1 system is connected with a resistor R23, the R23 is directly connected with the collector of the Q2 and the second receiving terminal RXD2, the first lower side plate (11), the second lower side plate (12) and the third lower side plate (13) are all positioned on the upper surface of the bottom plate (1), the first upper side plate (21) and the second upper side plate (22) are all positioned on the lower surface of the top plate (2), the terminal openings (20) on the first lower side plate (11), the first upper side plate (21) and the top plate (2) are circular or rectangular, the sizes and the shapes of different terminal openings (20) are the same or different, be equipped with a bayonet socket (17) on fixed plate (23), bayonet socket (17) are the calabash shape, electric capacity C1, C6, C7, C14, C15 are electrolytic capacitor, OUTPUT voltage among the power module is OUTPUT = R1+ R2/R2 0.8V, the level of VCC1 system is greater than the level of VCC2 system all the time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710647982.7A CN107278075B (en) | 2017-08-01 | 2017-08-01 | DTU box for Internet of things |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710647982.7A CN107278075B (en) | 2017-08-01 | 2017-08-01 | DTU box for Internet of things |
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| CN107278075A CN107278075A (en) | 2017-10-20 |
| CN107278075B true CN107278075B (en) | 2022-10-18 |
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| CN108443554A (en) * | 2018-03-27 | 2018-08-24 | 浙江佳乐科仪股份有限公司 | A kind of valve operation manipulator |
| CN113645786A (en) * | 2021-08-10 | 2021-11-12 | 上海顺诠科技有限公司 | Intelligent network card shell |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3376400B2 (en) * | 1994-06-20 | 2003-02-10 | マスプロ電工株式会社 | Electronic device housing |
| JP4382511B2 (en) * | 2004-02-05 | 2009-12-16 | パイオニア株式会社 | Conduction device |
| EP2369104A4 (en) * | 2008-11-20 | 2012-11-14 | Hubei Shengjia Wiring Co Ltd | Electric locking and sealing device, box with electric locking and sealing device and control system |
| JP6122372B2 (en) * | 2013-09-27 | 2017-04-26 | 新光電気工業株式会社 | Electronic component case and electronic component device |
| WO2016008003A1 (en) * | 2014-07-14 | 2016-01-21 | Davies Alexander Phillip | Method for controlling a power conversion system |
| CN204256418U (en) * | 2014-10-17 | 2015-04-08 | 黄岩区第一职业技术学校 | Based on the pendent lamp intelligent controller of Bluetooth technology |
| CN204856246U (en) * | 2015-07-14 | 2015-12-09 | 华南理工大学 | Aluminium alloy passivating process conductivity detection control apparatus |
| SG10201609410PA (en) * | 2015-11-30 | 2017-06-29 | Semiconductor Energy Lab | Semiconductor device, display panel, and electronic device |
| CN105472821A (en) * | 2015-12-18 | 2016-04-06 | 深圳市中孚能电气设备有限公司 | Lamp and mobile power supply circuit thereof |
| CN106409220B (en) * | 2016-09-29 | 2019-01-29 | 深圳创维－Rgb电子有限公司 | A kind of OLED drive electric power unit and OLED TV |
| CN106549489A (en) * | 2016-12-29 | 2017-03-29 | 南京国网电瑞继保科技股份有限公司 | A kind of operation method of self-powered distributed intelligence distribution terminal |
| CN207053945U (en) * | 2017-08-01 | 2018-02-27 | 浙江佳乐科仪股份有限公司 | A kind of Internet of Things DTU boxes |
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Address after: 314300 No. 1070 Lane 88 Yanbei West Road, Wuyuan Street, Haiyan County, Jiaxing City, Zhejiang Province Patentee after: ZHEJIANG JAROL SCIENTIFIC INSTRUMENT Co.,Ltd. Address before: 314300 Guyuan Village, Haiyan County, Jiaxing City, Zhejiang Province Patentee before: ZHEJIANG JAROL SCIENTIFIC INSTRUMENT Co.,Ltd. |
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| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20171020 Assignee: Jiaxing Leying New Energy Co.,Ltd. Assignor: ZHEJIANG JAROL SCIENTIFIC INSTRUMENT Co.,Ltd. Contract record no.: X2023330000367 Denomination of invention: A DTU box for the Internet of Things Granted publication date: 20221018 License type: Common License Record date: 20230630 |
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| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20171020 Assignee: Jiaxing Leyao New Energy Co.,Ltd. Assignor: ZHEJIANG JAROL SCIENTIFIC INSTRUMENT Co.,Ltd. Contract record no.: X2023330000384 Denomination of invention: A DTU box for the Internet of Things Granted publication date: 20221018 License type: Common License Record date: 20230712 |