CN216246467U - Handheld sensor diagnostic tester - Google Patents
Handheld sensor diagnostic tester Download PDFInfo
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- CN216246467U CN216246467U CN202122914771.XU CN202122914771U CN216246467U CN 216246467 U CN216246467 U CN 216246467U CN 202122914771 U CN202122914771 U CN 202122914771U CN 216246467 U CN216246467 U CN 216246467U
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Abstract
A handheld sensor diagnosis tester belongs to the field of testers and aims at the problems that field maintenance is difficult due to the fact that the remote environment is crude, the cruising ability of a notebook computer is insufficient and the like. The device comprises a main control chip, a backlight control circuit for the liquid crystal display screen, a monochromatic liquid crystal display screen, a physical key, a lithium battery charging circuit, a power output booster circuit, an output selection switch, a sensor interface, an RS485 communication circuit and a voltage monitoring circuit. According to the scheme, the high integration level is realized, the rechargeable lithium battery is arranged in the device, and the device is connected with the sensors or the tested equipment with different physical interfaces by matching with different connecting wires. The device can provide power for the sensor to be measured, directly read the value of the sensor, and measure the power supply condition on a communication cable, thereby realizing multiple purposes.
Description
Technical Field
The utility model relates to the field of testers, in particular to a handheld sensor diagnosis tester.
Background
The sensor is applied to the field of online sensors of equipment such as farmlands, greenhouses and plant protection. Communication line interruption or sensor failure is often caused by lightning stroke, burning, land cultivation, natural aging and the like. The suspected fault is replaced to enable the device or the device to carry out the work of field test, debugging, fault elimination and the like on the field through a notebook computer, a 485 conversion line, a multimeter and other tools. And the problems of difficult field maintenance work, low integration level, inconvenient power-on, inconvenient use and the like are caused by the limitation of factors such as poor remote environment, insufficient cruising ability of the notebook computer and the like.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a handheld sensor diagnosis tester which can be used for field sensor diagnosis test work. Compared with the traditional detector, the multifunctional detector integrates the software and hardware required by daily maintenance and testing, is provided with a rechargeable lithium battery, has multiple purposes, is fast to start and is stable to operate.
The technical scheme adopted by the utility model is as follows:
the handheld sensor diagnosis tester comprises a main control chip, a backlight control circuit for a liquid crystal display screen, a monochromatic liquid crystal display screen, a physical key, a lithium battery charging circuit, a power output boosting circuit, an output selection switch, a sensor interface, an RS485 communication circuit and a voltage monitoring circuit; the lithium battery charging circuit is connected with the lithium battery charging circuit, the lithium battery charging circuit is connected with the output selection switch through the power output boosting circuit, the lithium battery charging circuit is simultaneously and independently connected with the output selection switch, the lithium battery charging circuit is simultaneously connected with the main control chip, the output selection switch is connected with the sensor interface, the sensor interface is connected with the main control chip through the voltage monitoring circuit, the sensor interface is connected with the main control chip through the RS485 communication circuit, the main control chip is connected with the physical keys, and the main control chip is respectively connected with the monochromatic liquid crystal display screen and the backlight control circuit for the liquid crystal display screen;
the main control chip is used for receiving the sensor data and processing the data through an internal program;
the backlight control circuit for the liquid crystal display screen is used for executing the backlight display function of the monochromatic liquid crystal display screen;
the monochromatic liquid crystal display screen is used for displaying information such as sensor data, a human-computer operation interface and the like;
the physical keys are connected with the main control chip and used for setting information required by using the tester;
the lithium battery charging circuit is used for lithium battery protection, charging management and voltage output;
the lithium battery is used for obtaining electric energy through charging and supplying power to the handheld sensor diagnosis tester;
the power output booster circuit is used for boosting voltage and providing power for the sensor to be tested through the sensor interface,
the RS485 communication circuit is used for data communication;
the voltage monitoring circuit is used for monitoring the voltage of the communication cable;
the output selection switch is used for selecting the output voltage suitable for the sensor to be detected and sending the voltage to the sensor interface.
Further, the power supply output boosting circuit is used for boosting the voltage of 5V to the voltage of 12V.
Furthermore, the power output booster circuit is used for two power output modes, namely an active mode and a measurement mode, wherein the active mode is used for outputting voltage and supplying power to a sensor to be measured; and the measurement mode does not output voltage, monitors the power supply voltage in the measured communication line and is used for judging whether the voltage in the line is normal or not.
Further, the output selection switch is a three-section output selection switch, and is used for selecting the output voltage suitable for the sensor to be tested and sending the voltage of 5V or 12V to the sensor interface.
Furthermore, the sensor interface is adapted to different connecting lines and used for connecting sensors or devices to be tested with different physical interfaces.
The utility model has the beneficial effects that:
1. the utility model has professional use, adopts a design mode of combining software and hardware, has higher integration level and is internally provided with the rechargeable lithium battery.
2. The utility model can provide power supply for the sensor to be tested, directly read the value of the sensor, and measure the power supply condition on the communication cable by matching different connecting wires to connect the sensors with different physical interfaces or the equipment to be tested, thereby realizing multiple purposes of one machine.
Drawings
FIG. 1 is a functional block diagram of a handheld sensor diagnostic tester;
FIG. 2 is a diagram of a handheld sensor diagnostic tester master control circuit;
FIG. 3 is a 3.3V voltage regulator circuit diagram of the hand-held sensor diagnostic tester;
FIG. 4 is a circuit diagram of a hand-held sensor diagnostic tester AD reference voltage;
FIG. 5 is a circuit diagram of a handheld sensor diagnostic tester EEPROM;
FIG. 6 is a wiring diagram of a liquid crystal display of the hand held sensor diagnostic tester and a backlight control circuit for the liquid crystal display; FIG. 7 is a circuit diagram of a physical key of the hand-held sensor diagnostic tester;
FIG. 8 is a lithium battery charging circuit diagram of the handheld sensor diagnostic tester;
FIG. 9 is a power output boost circuit diagram of the handheld sensor diagnostic tester;
FIG. 10 is a circuit diagram of the hand held sensor diagnostic tester RS485 communication circuit and sensor interface;
FIG. 11 is a voltage monitoring circuit diagram of the handheld sensor diagnostic tester;
FIG. 12 is a schematic diagram of a hand-held sensor diagnostic tester output selector switch;
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application.
As shown in fig. 1, 2, 3, 4 and 5, the handheld sensor diagnostic tester includes a main control chip, a backlight control circuit for a liquid crystal display, a monochromatic liquid crystal display, a physical key, a lithium battery charging circuit, a power output boosting circuit, an output selection switch, a sensor interface, an RS485 communication circuit, and a voltage monitoring circuit; lithium cell is connected with lithium cell charging circuit, lithium cell charging circuit passes through the power output boost circuit and is connected with the output selector switch, lithium cell charging circuit is simultaneously alone to be connected with the output selector switch, lithium cell charging circuit is connected with main control chip simultaneously, output selector switch and sensor interface connection, the sensor interface pass through voltage monitoring circuit with main control chip connects, the sensor interface simultaneously through RS485 communication circuit with main control chip connects, main control chip with physics key-press is connected, main control chip is connected with monochromatic liquid crystal display and liquid crystal display are with control circuit in a poor light respectively.
The main control chip adopts an STM32 single chip microcomputer as a core device of the handheld terminal, is connected with the sensor interface through an RS485 communication circuit, receives sensor data and processes the data through an internal program.
As shown in fig. 6, the backlight control circuit for a liquid crystal display panel is used for performing a backlight display function of a monochrome liquid crystal display panel. And the monochromatic liquid crystal display screen is used for displaying information such as sensor data, a human-computer operation interface and the like.
As shown in fig. 7, the physical keys are connected to the main control chip for setting information required for using the tester.
As shown in fig. 8, the lithium battery charging circuit is a main power supply of the handheld terminal, and converts the voltage output by the lithium battery into a stable 5V voltage to supply power to all circuit elements, and the lithium battery charging circuit has several functions of lithium battery protection, charging management, and 5V voltage output. The lithium battery is matched with a lithium battery charging circuit, can be charged and is used for supplying power to equipment.
As shown in fig. 9, the power output boost circuit boosts the internal 5V voltage to 12V, and supplies the 5V or 12V voltage to the sensor interface through the three-stage output selection switch. And 5V or 12V power supply is provided for the sensor to be tested. The handheld terminal has two power output modes, namely an active mode and a measurement mode, and is selected through a three-section switch. In the active mode, two output voltages of 5V and 12V are selected respectively so as to be compatible with the sensors to be tested with different power supply voltages. And in the measurement mode, the handheld terminal does not output voltage outwards, but monitors the power supply voltage in the communication line to be measured to judge whether the voltage in the line is normal or not.
As shown in fig. 10, the RS485 communication circuit is used for connecting the measured sensor to perform data communication through a modbus communication protocol. The sensor interface is used for selecting a proper connecting line to connect a sensor to be tested with the sensor interface of the tester through baud rate, address codes, reading instructions, register addresses and other information, and is matched with different connecting lines to connect sensors with different physical interfaces or equipment to be tested.
As shown in fig. 11, the voltage monitoring circuit is configured to monitor a voltage of the communication cable and feed back a signal to the main control chip.
As shown in fig. 12, the output selection switch is a three-stage output selection switch for selecting an output voltage suitable for the sensor to be tested, and supplying a voltage of 5V or 12V to the sensor interface.
The test method is as follows:
the technical parameters of the sensor to be tested, such as the supply voltage of the sensor, the signal output type of the sensor, the baud rate, and the device address code, should be known sufficiently by a technician before testing.
1. Test sensor
The output voltage suitable for the sensor to be tested is selected by the output selection switch. Setting baud rate, address code, reading instruction, register address and other information via keys. Information is input to the main control chip through the physical key circuit, then a proper connecting wire is selected to connect the sensor to be tested with a sensor interface of the tester, if boosting is needed, the lithium battery outputs the boosting circuit through the power supply to boost the voltage and then transmits the voltage to the sensor interface through the output selection switch, and the sensor interface supplies power to the sensor to be tested. The measured sensor communicates with the RS485 communication circuit through the sensor interface, the signal is transmitted to the main control chip through the RS485 communication circuit, the main control chip processes the back, transmits the information to the monochromatic liquid crystal display screen, controls the screen brightness through the backlight control circuit for the liquid crystal display screen, and at the moment, if the measured sensor can normally check the read numerical value through the liquid crystal display screen, whether the reading of the sensor is correct or not through the further analysis of the numerical value. If no corresponding value is read or the output voltage is pulled low, there is a possibility of a sensor internal short circuit or sensor damage.
2. Testing communication cable
The output selection switch is switched to a measurement mode, the communication cable is connected with a sensor interface of the tester, and at the moment, the tester does not output power supply voltage outwards, but can detect the power supply voltage in the communication cable. The measured voltage signal is transmitted to the main control chip through the voltage monitoring circuit, the main control chip processes the voltage signal and transmits information to the monochromatic liquid crystal display screen, the backlight control circuit is used for controlling the screen brightness through the liquid crystal display screen, and through the information displayed on the screen, if the voltage is abnormal or no power exists, the communication cable and the superior power supply equipment need to be further checked.
3. Testing of unknown sensors
Sensors or communication cables of unknown supply voltage are not recommended and too high a supply voltage may cause damage to the tester or sensors. For the sensors with known power supply voltage and output types but with unknown working baud rate, address codes and other information, the test can be carried out by automatically searching or changing manual settings.
Claims (5)
1. Hand-held type sensor diagnostic test appearance, including main control chip, liquid crystal display is with control circuit in a poor light, monochromatic liquid crystal display, the physics button, the lithium cell, lithium cell charging circuit, power output boost circuit, output selector switch, sensor interface, RS485 communication circuit and voltage monitoring circuit, its characterized in that: the lithium battery charging circuit is connected with the lithium battery charging circuit, the lithium battery charging circuit is connected with the output selection switch through the power output boosting circuit, the lithium battery charging circuit is simultaneously and independently connected with the output selection switch, the lithium battery charging circuit is simultaneously connected with the main control chip, the output selection switch is connected with the sensor interface, the sensor interface is connected with the main control chip through the voltage monitoring circuit, the sensor interface is connected with the main control chip through the RS485 communication circuit, the main control chip is connected with the physical keys, and the main control chip is respectively connected with the monochromatic liquid crystal display screen and the backlight control circuit for the liquid crystal display screen;
the main control chip is used for receiving the sensor data and processing the data through an internal program;
the backlight control circuit for the liquid crystal display screen is used for executing the backlight display function of the monochromatic liquid crystal display screen;
the monochromatic liquid crystal display screen is used for displaying sensor data and human-computer operation interface information;
the physical key is used for setting information required by using the tester;
the lithium battery charging circuit is used for lithium battery protection, charging management and voltage output;
the lithium battery is used for obtaining electric energy through charging and supplying power to the handheld sensor diagnosis tester;
the power output booster circuit is used for boosting voltage and providing power for the sensor to be tested through the sensor interface,
the RS485 communication circuit is used for data communication;
the voltage monitoring circuit is used for monitoring the voltage of the communication cable;
the output selection switch is used for selecting the output voltage suitable for the sensor to be detected and sending the voltage to the sensor interface.
2. The hand-held sensor diagnostic tester of claim 1, wherein: the power supply output boosting circuit is used for boosting the voltage of 5V to the voltage of 12V.
3. The hand-held sensor diagnostic tester of claim 1, wherein: the power output booster circuit comprises an active mode and a measurement mode, wherein the active mode is used for outputting voltage and supplying power to a measured sensor; and the measurement mode does not output voltage, monitors the power supply voltage in the measured communication line and is used for judging whether the voltage in the line is normal or not.
4. The hand-held sensor diagnostic tester of claim 1, wherein: the output selection switch is a three-section output selection switch and is used for selecting the output voltage suitable for the sensor to be tested and sending the 5V or 12V voltage to the sensor interface.
5. The hand-held sensor diagnostic tester of claim 1, wherein: the sensor interface is adapted to different connecting wires and used for connecting sensors with different physical interfaces or tested equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122914771.XU CN216246467U (en) | 2021-11-25 | 2021-11-25 | Handheld sensor diagnostic tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122914771.XU CN216246467U (en) | 2021-11-25 | 2021-11-25 | Handheld sensor diagnostic tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216246467U true CN216246467U (en) | 2022-04-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122914771.XU Active CN216246467U (en) | 2021-11-25 | 2021-11-25 | Handheld sensor diagnostic tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216246467U (en) |
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2021
- 2021-11-25 CN CN202122914771.XU patent/CN216246467U/en active Active
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