CN210168232U

CN210168232U - Support 4G full net of GNSS location to lead to DTU module

Info

Publication number: CN210168232U
Application number: CN201921183120.4U
Authority: CN
Inventors: 唐宾国; 余峰华; 胡啸; 王振; 田守辉
Original assignee: Wuhan Zhongyi Tiandi Iot Technology Co Ltd
Current assignee: Wuhan Zhongyi Tiandi Iot Technology Co Ltd
Priority date: 2019-07-25
Filing date: 2019-07-25
Publication date: 2020-03-20
Anticipated expiration: 2029-07-25

Abstract

The utility model discloses a support 4G full net expert DTU module of GNSS location contains: the GNSS positioning system comprises a main control chip, a 4G network communication chip, a power supply circuit, a GNSS positioning chip circuit, an interface circuit, a memory and a power supply monitoring circuit; the main control chip STM32F407VET6 is in communication connection with the 4G network communication chip EC20R2.1 and the GNSS positioning chip circuit respectively; the power supply monitoring circuit is connected to an input line of the power supply circuit so as to control the on-off of the power supply line according to whether the power supply of the power supply circuit is normal or not; the interface circuit comprises one path of RS232 interface circuit and one path of RS485 interface circuit, which are respectively connected to the main control chip STM32F407VET6, and the memory is connected to the main control chip STM32F407VET6 for data storage and reading. The utility model discloses can realize 4G full net and lead to, can realize multiple locate mode's location simultaneously.

Description

Support 4G full net of GNSS location to lead to DTU module

Technical Field

The utility model relates to a data transmission field based on 4G network especially involves the simple reliable transmission of the relevant data who will unable lug connection to the collector and the controller of internet and leads to the DTU module of the network server that has set up, and this leads to the DTU module and can fix a position through GNSS (global navigation satellite system).

Background

4G is an abbreviation for fourth generation mobile communication technology. The 4G network is a data transmission network based on the fourth generation mobile communication technology. 4G full network refers to that all networks including 4G, 3G and 2G of mobile, telecom and 3 operators can be used domestically. The GNSS is generally called a Global Navigation Satellite System (Global Navigation Satellite System). It is a system including all satellite navigation systems

(GPS/GLONASS/BeiDou/Galileo/QZSS). A dtu (data Transfer unit) module, which is a wireless terminal device specially used for converting serial data into IP data or converting IP data into serial data and transmitting the serial data through a wireless communication network.

Many existing 4G network DTU modules are not truly full network, i.e. not fully capable of using all networks including 4G, 3G and 2G of mobile, telecommunications 3 operators. In some remote areas, the infrastructure of the mobile network is not perfect, and the supported network frequency band is limited. If the client in these areas uses a module which is not all network communication, the module may not transmit data through the mobile network, or the stability of data transmission may be affected. This has a great impact on the devices that need to be networked.

Meanwhile, the existing 4G network DTU module is rarely provided with a positioning system, and most DTU modules with the positioning system only support a GPS or a Beidou and other single positioning systems. This has a great influence on the positioning speed and positioning accuracy when using satellite positioning.

SUMMERY OF THE UTILITY MODEL

The utility model provides an above-mentioned technical problem, a support 4G full net of GNSS location leads to DTU module is provided.

The utility model provides a technical scheme that its technical problem adopted is: constructing a 4G full-network DTU module supporting GNSS positioning, comprising: the system comprises a main control chip STM32F407VET6, a 4G network communication chip EC20R2.1, a power supply circuit, a GNSS positioning chip circuit, an interface circuit, a memory and a power supply monitoring circuit;

the main control chip STM32F407VET6 is in communication connection with the 4G network communication chip EC20R2.1 and the GNSS positioning chip circuit respectively; the power supply circuit provides a working power supply for the 4G full-network DTU module, and the power supply monitoring circuit is connected to an input line of the power supply circuit so as to control the on-off of the power transmission line according to whether the power supply of the power supply circuit is normal or not; the interface circuit comprises one path of RS232 interface circuit and one path of RS485 interface circuit, which are respectively connected to the main control chip STM32F407VET6, and the memory is connected to the main control chip STM32F407VET6 for data storage and reading.

Further, in the utility model discloses a support 4G full net expert DTU module of GNSS location, power supply monitoring circuit includes first controlled switch circuit, second controlled switch circuit and NE555 timer; the input of the power supply monitoring circuit is 12V direct current VCC12_ IN, the control end of the first controlled switch circuit is connected to a main control chip STM32F407VET6, and one of the two controlled ends is connected to a DISC pin of an NE555 timer and the other is grounded; the control terminal of the second controlled switch circuit is connected to the OUT pin of the NE555 timer, and two controlled terminals, one of which is connected to VCC12_ IN and the other of which is connected to the power output VCC 12V.

Further, the utility model discloses an among the 4G full net who supports GNSS location leads to DTU module, power supply monitoring circuit includes chip LM2596-5.0V, chip LMA2596-ADJ, chip LM1117-3.3, VCC12V is as LM 2596-5.0V's input, converts the power into 5.0V, and 5.0V is as chip LM 1117-3.3's input, converts the power into 3.3V, and VCC12V is as LMA 2596-ADJ's input simultaneously, converts the power into 4.0V, thereby does 4G full net leads to the DTU module provides the power of multiple voltage.

Further, the utility model discloses a support in the 4G full net of GNSS location leads to DTU module, GNSS location chip circuit adopts chip AT6558 to realize, and chip AT 6558's 19 th, 20, 23 pin are connected to the 24 th, 23 rd, 3 pins of main control chip STM32F407VET6, and AT 6558's 2 nd pin is connected to an antenna and carries out the transmission of signal.

Further, in the present invention, the 4G full-network DTU module supporting GNSS positioning further includes a third switch circuit, one of two controlled terminals of the third switch circuit is grounded, and the other is connected to pin 21 of EC20R2.1, and the control terminal is connected to pin 2 of STM32F407VET6, so as to control whether to power up EC20R2.1 through STM32F407VET 6; EC20R2.1, the 49 th pin is connected to an antenna for signal transmission; EC20R2.1, and

pins

61, 67 and 68 are connected to

pins

1, 56 and 55 of STM32F407VET6 through a current limiting resistor for data communication.

Furthermore, the utility model discloses a support in the full net of 4G of GNSS location leads to the DTU module, still include MUP-C720 and esd 6v1-5w6 to connect the SIM card, the pin VCC, RST, CLK, DATA of MUP-C720 connect the 4 th, 5, 6, 1 pin of esd 6v1-5w6 respectively, and connect the 14 th, 17 th, 16 th, 15 th pin of EC20R2.1 respectively simultaneously; EC20R2.1, a current limiting resistor and an LED are connected in series between pin 6 and the ground for indicating whether there is a network connection; EC20R2.1,

pins

69, 70 and 71 are connected to the USB interface, wherein, pins 69 and 70 of EC20R2.1 are respectively connected to two signal connection terminals of the USB interface through a current limiting resistor, and pin 71 of EC20R2.1 is connected to a positive power terminal of the USB interface.

Further, in the utility model discloses a support 4G full net leads to DTU module of GNSS location, the memory is 24CM01, and 24CM 01's the 5 th, 6 th pin is connected to STM32F407VET 6's the 48 th, 47 th pin respectively.

Implement the utility model discloses a support 4G full net of GNSS location leads to DTU module has following beneficial effect: the utility model discloses can realize 4G full net and lead to, can realize multiple locate mode's location simultaneously.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

FIG. 1 is a schematic block diagram of an embodiment of a 4G full network DTU module supporting GNSS positioning;

FIG. 2 is a circuit schematic of a master control chip;

FIG. 3 is a circuit schematic of the interface circuit and the power supply monitoring circuit;

FIG. 4 is a circuit schematic of the interface circuit;

FIG. 5 is a schematic circuit diagram of the circuit of the 4G network communication chip EC20R2.1 and the GNSS positioning chip;

fig. 6 is a schematic circuit diagram of the SIM card, USB interface, antenna and indicator light.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1-6, the 4G all-internet-enabled DTU module for supporting GNSS positioning of the present embodiment includes: the system comprises a main control chip STM32F407VET6, a 4G network communication chip EC20R2.1, a power supply circuit, a GNSS positioning chip circuit, an interface circuit, a memory and a power supply monitoring circuit;

The power supply monitoring circuit comprises a first controlled switching circuit (a circuit based on a Q2 part), a second controlled switching circuit (a circuit based on a Q3 part and a Q4 part) and an NE555 timer; the input of the power supply monitoring circuit is 12V direct current VCC12_ IN, the control end of the first controlled switch circuit is connected to a main control chip STM32F407VET6, and one of the two controlled ends is connected to a DISC pin of an NE555 timer and the other is grounded; the control terminal of the second controlled switch circuit is connected to the OUT pin of the NE555 timer, and two controlled terminals, one of which is connected to VCC12_ IN and the other of which is connected to the power output VCC 12V.

When the main control chip STM32F407VET6 works, the main control chip STM32F407VET6 sends a control signal to the control end of the first controlled switch circuit, so that whether the DISC pin of the NE555 timer is set to zero or not is controlled, the output of the OUT pin is controlled, the working state of the second controlled switch circuit is further controlled, and whether the VCC12_ IN can continue to supply power or not is controlled. The main control chip STM32F407VET6 is internally provided with a module for detecting whether the working power supply is abnormal, when the working power supply is abnormal, the main control chip STM32F407VET6 indirectly controls the disconnection of the S pole and the D pole of the Q3 based on the control principle, and at the moment, the power supply is stopped.

Meanwhile, the NE555 timer can also control the output of the OUT end of the NE555 timer, so that the working state of the second switching circuit is controlled. The NE555 timer is set to control the conduction of the S pole and the D pole of the Q3 once at intervals of each end time (if the conduction of the S pole and the D pole of the Q3 is on, the original state is not influenced, and if the conduction of the S pole and the D pole of the Q3 is off, the conduction is controlled), so that the main control chip STM32F407VET6 can be powered on periodically and monitor a working power supply, when the power supply is normal, the single chip microcomputer can control the conduction of the S pole and the D pole of the Q3, and otherwise, the S pole and the D pole of the Q3 are turned off.

Therefore, on the one hand, the safety of the module is guaranteed in power supply, on the other hand, after power supply faults are discharged, a user does not need to perform manual operation on the module, and the intelligent power supply module is particularly suitable for places where traffic is inconvenient or manual operation is inconvenient due to other reasons.

The power supply monitoring circuit comprises a chip LM2596-5.0V, a chip LMA2596-ADJ and a chip LM1117-3.3, wherein VCC12V is used as the input of the LM2596-5.0V, the power supply is converted into 5.0V, the 5.0V is used as the input of the chip LM1117-3.3, the power supply is converted into 3.3V, and meanwhile VCC12V is used as the input of the LMA2596-ADJ and is converted into 4.0V, so that a power supply with various voltages is provided for the 4G full-network DTU module.

The GNSS positioning chip circuit is realized by a chip AT6558,

pins

19, 20 and 23 of the chip AT6558 are connected to

pins

24, 23 and 3 of a STM32F407VET6, and pin 2 of the AT6558 is connected to an antenna for signal transmission. The GNSS is generally called a Global Navigation Satellite System (Global Navigation Satellite System). It is the one that contains all the satellite navigation systems (GPS/GLONASS/BeiDou/Galileo/QZSS). Compared with a single satellite positioning system (GPS/Beidou and the like), the positioning precision provided by the system is higher, and the positioning speed is higher. The device is convenient for users to use on some equipment needing satellite navigation or satellite positioning, and can also meet the requirements of high-speed and high-precision satellite navigation or satellite positioning.

The utility model discloses a third switch circuit (based on Q1 partial circuit), ground connection of two controlled ends of third switch circuit, the 21 st pin of EC20R2.1 is connected to another, and the control end is connected to STM32F407VET 6's 2 nd pin to whether go up electric work through STM32F407VET6 control EC20R2.1; EC20R2.1, the 49 th pin is connected to an antenna for signal transmission; EC20R2.1, and

pins

61, 67 and 68 are connected to

pins

The 4G full-network-through DTU module of this embodiment further includes a MUP-C720 and an esd 6v1-5w6 to connect to the SIM card, where pins VCC, RST, CLK, and DATA of the MUP-C720 are respectively connected to

pins

4, 5, 6, and 1 of the esd 6v1-5w6, and are simultaneously respectively connected to

pins

14, 17, 16, and 15 of EC20R2.1; EC20R2.1, a current limiting resistor and an LED are connected in series between pin 6 and the ground for indicating whether there is a network connection; EC20R2.1,

pins

69, 70 and 71 are connected to the USB interface, wherein, pins 69 and 70 of EC20R2.1 are respectively connected to two signal connection terminals of the USB interface through a current limiting resistor, and pin 71 of EC20R2.1 is connected to a positive power terminal of the USB interface. The 5 th and 6 th pins of the memory are 24CM01, and 24CM01 are respectively connected to the 48 th and 47 th pins of STM32F407VET 6. The interface circuit part also provides a JTAG chip for testing STM32F407VET 6.

The RS232 interface is mainly convenient for the PC device to configure the module and read the operating status of the module, etc. Of course, the user can also transmit the data containing the standard RS232 interface device to the 4G full-network DTU module through the interface. The module sends the received data to the corresponding server according to the protocol configured by the user and the address of the server, receives the data and the instruction returned by the server, and feeds back the data and the instruction to the connected equipment. The RS485 interface is a common communication interface, has strong anti-interference capability and long transmission distance compared with an RS232 interface, and has the key that the simple networking function of multiple devices can be realized by adopting a mode of one host and multiple slaves, rather than only point-to-point data transmission as in RS 232. Meanwhile, the system comprises an RS232 interface and an RS485 interface, so that more selection and application modes are provided for a user.

The 4G full-network DTU module integrates a plurality of standard network protocols, wherein the standard network protocols comprise a TCP protocol, a UDP protocol, an FTP protocol, an HTTP protocol, an NTP protocol, an MQTP protocol, an Ali Iot protocol and a self-defined protocol. The user can select the required protocol through the RS232 interface through the PC equipment, and the protocol can be directly used after being set, so that the convenience for the user to use is improved. The difficulty and time of equipment development of a user are reduced.

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A 4G full network DTU module supporting GNSS positioning, comprising: the system comprises a main control chip STM32F407VET6, a 4G network communication chip EC20R2.1, a power supply circuit, a GNSS positioning chip circuit, an interface circuit, a memory and a power supply monitoring circuit;

the main control chip STM32F407VET6 is in communication connection with the 4G network communication chip EC20R2.1 and the GNSS positioning chip circuit respectively; the power supply circuit provides a working power supply for the 4G full-network DTU module, and the power supply monitoring circuit is connected to an input line of the power supply circuit so as to control the on-off of the input line according to whether the power supply of the power supply circuit is normal or not; the interface circuit comprises one path of RS232 interface circuit and one path of RS485 interface circuit, which are respectively connected to the main control chip STM32F407VET6, and the memory is connected to the main control chip STM32F407VET6 for data storage and reading.

2. The GNSS positioning enabled 4G full-network DTU module of claim 1, wherein the power supply monitoring circuit comprises a first controlled switching circuit, a second controlled switching circuit and an NE555 timer; the input of the power supply monitoring circuit is 12V direct current VCC12_ IN, the control end of the first controlled switch circuit is connected to a main control chip STM32F407VET6, and one of the two controlled ends is connected to a DISC pin of an NE555 timer and the other is grounded; the control terminal of the second controlled switch circuit is connected to the OUT pin of the NE555 timer, and two controlled terminals, one of which is connected to VCC12_ IN and the other of which is connected to the power output VCC 12V.

3. The GNSS location supported 4G all-network-through DTU module of claim 2, wherein the power monitoring circuit comprises a chip LM2596-5.0V, a chip LMA2596-ADJ, a chip LM1117-3.3, a VCC12V as input of the LM2596-5.0V, a power supply is converted to 5.0V, the 5.0V as input of the chip LM1117-3.3, the power supply is converted to 3.3V, and a VCC12V as input of the LMA2596-ADJ, the power supply is converted to 4.0V, so as to provide power supply of various voltages for the 4G all-network-through DTU module.

4. The 4G full-network-communication DTU module supporting GNSS positioning according to claim 1, wherein the GNSS positioning chip circuit is implemented by a chip AT6558, pins 19, 20 and 23 of the chip AT6558 are connected to pins 24, 23 and 3 of a main control chip STM32F407VET6, and pin 2 of the AT6558 is connected to an antenna for signal transmission.

5. The 4G full-network-through DTU module supporting GNSS positioning according to claim 1, further comprising a third switch circuit, wherein two controlled terminals of the third switch circuit are connected to ground, and the other switch circuit is connected to pin 21 of EC20R2.1, and the control terminal is connected to pin 2 of STM32F407VET6, so as to control whether EC20R2.1 is powered on or not through STM32F407VET 6; the 49 th pin of EC20R2.1 is connected to an antenna for signal transmission; pins 61, 67 and 68 of EC20R2.1 are connected to pins 1, 56 and 55 of STM32F407VET6 through a current limiting resistor for data communication.

6. The GNSS positioning enabled 4G full-network DTU module of claim 1, further comprising MUP-C720 and esd 6v1-5w6 for connecting SIM card, wherein pins VCC, RST, CLK, DATA of MUP-C720 are connected to 4 th, 5 th, 6 th, 1 st pins of esd 6v1-5w6, respectively, and simultaneously connected to 14 th, 17 th, 16 th, 15 th pins of EC20R2.1, respectively; a current limiting resistor and an LED are connected in series between the 6 th pin of the EC20R2.1 and the ground to indicate whether a network connection exists or not; the 69 th, 70 th and 71 th pins of the EC20R2.1 are connected to the USB interface, wherein the 69 th and 70 th pins of the EC20R2.1 are respectively connected to two signal connection terminals of the USB interface through current limiting resistors, and the 71 th pin of the EC20R2.1 is connected to a positive power supply terminal of the USB interface.

7. The GNSS positioning enabled 4G full-network DTU module of claim 1, wherein the memories 24CM01 and 24CM01 are connected to pins 48 and 47 of STM32F407VET6, respectively.