CN216216928U - Remote 4G module communication switching circuit board - Google Patents
Remote 4G module communication switching circuit board Download PDFInfo
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- CN216216928U CN216216928U CN202122614392.9U CN202122614392U CN216216928U CN 216216928 U CN216216928 U CN 216216928U CN 202122614392 U CN202122614392 U CN 202122614392U CN 216216928 U CN216216928 U CN 216216928U
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Abstract
The utility model relates to a remote 4G module communication switching circuit board, which comprises a switching circuit, wherein the switching circuit comprises an interface P1 for accessing serial port signals, an interface P3 for outputting 422 signals and a switching chip U3 connected between the interface P1 and the interface P3, and the switching chip U3 is used for the mutual switching of the serial port signals and the 422 signals of a 4G module; the adapter chip U3 adopts a MAX490ESA chip, a pin 1 of the adapter chip U3 is connected with a voltage of +3.3V, a pin 2 and a pin 3 of the adapter chip U3 are connected to an interface P1, a pin 4 of the adapter chip is grounded, and a pin 5, a pin 6, a pin 7 and a pin 8 of the adapter chip U3 are respectively connected to an interface P3 through a resistor R8, a resistor R6, a resistor R5 and a resistor R3; the utility model can expand the communication distance to more than 300 meters, and effectively solves the problem that no mobile signal or weak signal exists at the installation position of the equipment of the Internet of things.
Description
Technical Field
The utility model belongs to the technical field of communication of the Internet of things, and particularly relates to a remote 4G module communication switching circuit board.
Background
The internet of things is a wireless node network formed by sensors, action equipment and the like and acquisition devices, and then the acquired information is generally networked and sent to a background by a centralized gateway for a supervisor to check for observation or operation. However, the communication distance of a general serial port-to-4G module is short and less than 200 meters, and communication is affected when no mobile signal or weak signal is arranged at the installation position of the Internet of things.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a long-distance 4G module communication switching circuit board.
The technical scheme of the utility model is as follows:
a long-distance 4G module communication switching circuit board comprises a switching circuit, wherein the switching circuit comprises an interface P1 for accessing serial port signals, an interface P3 for outputting 422 signals and a switching chip U3 connected between the interface P1 and the interface P3, and the switching chip U3 is used for switching the serial port signals and the 422 signals of a 4G module;
the switching chip U3 adopts a MAX490ESA chip, pin 1 of the switching chip U3 is connected to +3.3V voltage, pin 2 and pin 3 of the switching chip U3 are connected to the interface P1, pin 4 of the switching chip is grounded, pin 5 of the switching chip U3 is connected to the interface P3 through a resistor R8, pin 6 of the switching chip U3 is connected to the interface P3 through a resistor R6, pin 7 of the switching chip U3 is connected to the interface P3 through a resistor R5, pin 8 of the switching chip U3 is connected to the interface P3 through a resistor R3, a TVS diode is connected between the resistor R8, the resistor R6, the resistor R5, the resistor R3 and the interface P3, the other end of the TVS diode is grounded, the TVS diode is protected, protection is enhanced, the service life of the switching chip U3 and other components is improved, and the resistances of the resistor R3, the resistor R3 and the resistance Ω 100 are all.
Further, a resistor R7 is connected to a common junction of the resistor R8 and the corresponding TVS diode, a resistor R4 is connected to a common junction of the resistor R5 and the corresponding TVS diode, the other ends of the resistor R7 and the resistor R4 are both suspended, and the resistances of the resistor R7 and the resistor R4 are 120 Ω.
Further, connect gradually resistance R11 and emitting diode D4 between pin 2 of switching chip U3 and the +3.3V voltage, connect gradually resistance R10 and emitting diode D3 between pin 3 of switching chip U3 and the +3.3V voltage, the +3.3V voltage still connects gradually resistance R9 and emitting diode D1, emitting diode D1's other end ground connection, emitting diode D1 are used for instructing the electrical connection state, and emitting diode D10 and emitting diode D11 are used for instructing the communication state.
Furthermore, the remote 4G module communication switching circuit board further comprises a power supply circuit for converting voltage for the switching circuit, the power supply circuit adopts two-stage voltage reduction, the power supply circuit firstly adopts an XL1410E1 chip to reduce the connected DC12V into DC5V, and then outputs the DC5V into 3.3V voltage through an AMS1117-3.3 chip.
Further, the remote 4G module communication switching circuit board further comprises a circuit board, the switching circuit and the power supply circuit are integrated on the circuit board, and the interface P1 and the interface P3 are arranged on opposite sides or adjacent sides of the circuit board.
Compared with the prior art, the utility model has the beneficial effects that:
by connecting the utility model between the generating end and the receiving end, the transmitting end can convert the serial port signal of the 4G module into a 422 signal, the receiving end converts the 422 signal into the serial port signal, the original short-distance serial port 4G module can be expanded to a communication distance of more than 300 meters by the switching circuit board, and the problem that no mobile signal or weak signal exists at the installation position of the Internet of things equipment is effectively solved.
Drawings
Fig. 1 is a schematic circuit diagram of a patching circuit according to an embodiment of the utility model.
Fig. 2 is a schematic circuit diagram of a power circuit according to an embodiment of the present invention.
Fig. 3 is a circuit board layout diagram of the embodiment of the utility model with only the adapting circuit.
Fig. 4 is a layout diagram of a circuit board including a patching circuit and a power circuit according to an embodiment of the utility model.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and fig. 3, a remote 4G module communication switching circuit board includes a switching circuit, where the switching circuit includes an interface P1 for accessing serial port signals, an interface P3 for outputting 422 signals, and a switching chip U3 connected between the interface P1 and the interface P3, and the switching chip U3 is used for switching between the serial port signals of the 4G module and the 422 signals;
the switching chip U3 adopts a MAX490ESA chip, pin 1 of the switching chip U3 is connected with +3.3V voltage, pin 2 and pin 3 of the switching chip U3 are connected to an interface P1, pin 4 of the switching chip is grounded, pin 5 of the switching chip U3 is connected to an interface P3 through a resistor R8, pin 6 of the switching chip U3 is connected to an interface P3 through a resistor R6, pin 7 of the switching chip U3 is connected to an interface P3 through a resistor R5, pin 8 of the switching chip U3 is connected to an interface P3 through a resistor R3, a TVS diode is respectively connected between the resistor R8, the resistor R6, the resistor R5 and the resistor R3 and the interface P3, the other end of the TVS diode is grounded, the TVS diode is prevented from being protected, protection is enhanced, the service life of the switching chip U3 and other components is prolonged, and the resistances of the resistor R3, the resistor R3 and the resistances of the resistor R3 are all 100 omega; through setting up 4G module communication switching circuit board, change the serial port signal of transmitting terminal 4G module into 422 signals, 422 signal remote communication anti-voltage attenuation ability is strong, guarantees that 4G module normally works under the remote condition, and expandable communication distance reaches more than 300 meters, effectively solves the problem that thing networking equipment mounted position does not have mobile signal or signal weak. Fig. 3 is a layout diagram of a circuit board with only the patching circuit.
Further, as shown in fig. 1, a common junction of the resistor R8 and the corresponding TVS diode is connected with a resistor R7, a common junction of the resistor R5 and the corresponding TVS diode is connected with a resistor R4, the other ends of the resistor R7 and the resistor R4 are both suspended, the resistances of the resistor R7 and the resistor R4 are 120 Ω, and the other ends of the resistor R7 and the resistor R4 are suspended to perform filtering.
Further, as shown in fig. 1, a resistor R11 and a light emitting diode D4 are sequentially connected between a pin 2 and a +3.3V voltage of the adaptor chip U3, a resistor R10 and a light emitting diode D3 are sequentially connected between a pin 3 and a +3.3V voltage of the adaptor chip U3, the +3.3V voltage is further sequentially connected with a resistor R9 and a light emitting diode D1, the other end of the light emitting diode D1 is grounded, the other end of the light emitting diode D1 is grounded, the light emitting diode D1 is used for indicating a power connection state, and the light emitting diode D10 and the light emitting diode D11 are used for indicating a communication state; fig. 3 is a layout diagram of a circuit board with only the patching circuit.
Further, as shown in fig. 2, the remote 4G module communication switching circuit board further includes a power circuit for converting voltage for the switching circuit, the power circuit adopts two-stage voltage reduction, the power circuit firstly adopts XL1410E1 chip to reduce the connected DC12V to DC5V, and then outputs DC5V to 3.3V voltage through AMS1117-3.3 chip; the power supply circuit supplies power by using 12V, the XL1410E1 wide-range voltage chip and the AMS1117-3.3 forward low-voltage-drop voltage regulator regulate the voltage of the DC12V to 3.3V, an additional power supply is not needed, the DC12V is common direct-current supply voltage, and the direct conversion circuit is more convenient to use.
In one embodiment, as shown in fig. 4, the long-distance 4G module communication patch circuit board further comprises a circuit board on which the patch circuit and the power circuit are integrated, and the interface P1 and the interface P3 are on opposite or adjacent sides of the circuit board to facilitate connection with the outside; in fig. 3, the interface P1 and the interface P3 are located on two long sides of the circuit board, the switching chip is marked as U3, the XL1410E1 wide-range voltage chip is marked as U1, and the AMS1117-3.3 chip is marked as U2.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the utility model can be made, and equivalents and modifications of some features of the utility model can be made without departing from the spirit and scope of the utility model.
Claims (5)
1. The utility model provides a long distance 4G module communication switching circuit board which characterized in that: the switching circuit comprises an interface P1 for accessing serial port signals, an interface P3 for outputting 422 signals and a switching chip U3 connected between the interface P1 and the interface P3, wherein the switching chip U3 is used for switching the serial port signals of the 4G module and the 422 signals;
the adapter chip U3 adopts MAX490ESA chip, pin 1 of the adapter chip U3 is connected with +3.3V voltage, pin 2 and pin 3 of the adapter chip U3 are connected to an interface P1, pin 4 of the adapter chip is grounded, pin 5 of the adapter chip U3 is connected to an interface P3 through a resistor R8, pin 6 of the adapter chip U3 is connected to an interface P3 through a resistor R6, pin 7 of the adapter chip U3 is connected to the interface P3 through a resistor R5, pin 8 of the adapter chip U3 is connected to an interface P3 through a resistor R3, a TVS diode is respectively connected between the resistor R8, the resistor R6, the resistor R5 and the resistor R3 and the interface P3, and the other end of the TVS diode is grounded.
2. The long-range 4G modular communication patch circuit board of claim 1, wherein: the common junction of the resistor R8 and the corresponding TVS diode is connected with a resistor R7, the common junction of the resistor R5 and the corresponding TVS diode is connected with a resistor R4, and the other ends of the resistor R7 and the resistor R4 are both suspended.
3. The long-range 4G modular communication patch circuit board of claim 1, wherein: connect gradually resistance R11 and emitting diode D4 between pin 2 of switching chip U3 and the +3.3V voltage, connect gradually resistance R10 and emitting diode D3 between pin 3 of switching chip U3 and the +3.3V voltage, the +3.3V voltage still connects gradually resistance R9 and emitting diode D1, emitting diode D1's other end ground connection.
4. The long-range 4G modular communication patch circuit board of claim 1, wherein: the power supply circuit adopts two-stage voltage reduction, firstly adopts an XL1410E1 chip to reduce the connected DC12V into DC5V, and then outputs the DC5V into 3.3V voltage through an AMS1117-3.3 chip.
5. The long-range 4G module communication patch circuit board of claim 4, wherein: the adapter circuit and the power supply circuit are integrated on the circuit board, and the interface P1 and the interface P3 are arranged on opposite sides or adjacent sides of the circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122614392.9U CN216216928U (en) | 2021-10-28 | 2021-10-28 | Remote 4G module communication switching circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122614392.9U CN216216928U (en) | 2021-10-28 | 2021-10-28 | Remote 4G module communication switching circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216216928U true CN216216928U (en) | 2022-04-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122614392.9U Active CN216216928U (en) | 2021-10-28 | 2021-10-28 | Remote 4G module communication switching circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216216928U (en) |
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2021
- 2021-10-28 CN CN202122614392.9U patent/CN216216928U/en active Active
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