CN216696616U - Portable 485 hunting appearance - Google Patents

Abstract

The utility model provides a portable 485 hunting instrument, comprising: the power supply, the main control board and the key board are all arranged inside the shell, and the meter pen is inserted and fixed at the lower part of the shell; the main control board is respectively electrically connected with the power supply, the key board and the meter pen; the main control board includes: the charging and discharging module is electrically connected with a power supply; the linear voltage stabilizing circuit stabilizes the voltage provided by the charge-discharge module to 3V and supplies power to the singlechip main control module, the LCD screen and the 485 signal conversion module; the singlechip main control module is used for controlling the service logic of the whole product, and realizing 485 signal receiving and transmitting mode switching, signal transmission, signal analysis, LCD screen display and keypad signal receiving. The portable 485 line finder can quickly judge line faults.

Description

Portable 485 hunting appearance

Technical Field

The utility model relates to a line detection device, in particular to a portable 485 line finder.

Background

In the power supply field, the ammeter communication condition is often required to be periodically inspected so as to ensure high-quality operation of power supply, and the most common communication mode of ammeter communication is RS485 communication. It has the advantages of stable operation and high communication speed. The concentrator and the master station are connected safely and reliably by using a special communication bus. Unless the hardware of the equipment interface is damaged or the bus line is disconnected, the bus meter reading system can always keep good communication effect and reading success rate.

Due to the fact that the communication line is connected through the dedicated wired communication line, no other signals except communication signals exist on the line. The coupling of extraneous interference signals to the line is attenuated so much that the concentrator can communicate with the primary station at a higher rate. But it also has the disadvantages of difficult laying and high maintenance cost. The bus meter reading system needs to lay a communication line between the concentrator and the master station, and particularly when the electric energy meters are dispersed, the work amount of laying the communication line is large, and the appearance of the communication line erected outside is influenced. The damage of the communication line directly affects the communication effect of the bus meter reading mode. A timed check line is required to ensure its proper operation. In particular, when the line is installed outside, it is required to newly lay the line once it is broken or corroded. And for newly added users, wiring is required to enter the communication network in time.

The traditional detection mode generally uses a universal meter buzzing gear to judge the state of the 485 communication cable, and the fault finding is difficult and the construction cost is high. A special handheld device capable of rapidly judging faults is urgently needed in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a portable 485 line finder to quickly judge line faults.

In order to solve the problems, the portable 485 hunting instrument of the utility model comprises: a shell, a power supply, a main control panel, a key board and a meter pen, wherein,

the power supply, the main control board and the key board are all arranged in the shell, and the meter pen is inserted and fixed at the lower part of the shell;

the main control board is respectively electrically connected with the power supply, the key board and the meter pen;

the main control board includes: the charging and discharging module is electrically connected with a power supply; the linear voltage stabilizing circuit stabilizes the voltage provided by the charge-discharge module to 3V and supplies power to the singlechip main control module, the LCD screen and the 485 signal conversion module; the singlechip main control module is used for controlling the service logic of the whole product, and realizing 485 signal receiving and transmitting mode switching, signal transmission, signal analysis, LCD screen display and keypad signal receiving.

Preferably, the power supply is a rechargeable lithium battery, and cyclic charging can be achieved.

Preferably, the main control board carries the LED lighting module, the singlechip main control module controls the LED lighting module to work, and the field lighting function can be realized.

Preferably, the main control board carries on the buzzer circuit, and the work of the buzzer circuit is controlled by the singlechip main control module, so that prompt tone reminding can be realized.

Preferably, the LCD screen is a dot matrix screen and can display Chinese characters and dot matrix pictures.

Preferably, the main control panel is provided with a backlight circuit, and the singlechip main control module controls the backlight circuit to work, so that backlight display of the LCD screen can be realized.

Preferably, the 485 signal conversion module is a bidirectional conversion circuit, and can convert a digital signal output by the singlechip into a standard 485 signal and convert the standard 485 signal into a digital signal which can be recognized by the singlechip.

Preferably, the pen gauges include red and black pen gauges, which respectively represent a and B of the 485 signal.

Compared with the prior art, the utility model has the beneficial effects that:

(1) the operation is humanized, Chinese character prompt and prompt tone prompt are convenient.

(2) The fault point can be located quickly.

(3) The field lighting circuit is provided, and construction is convenient.

Drawings

FIG. 1 is a schematic diagram of an appearance structure of a portable 485 line finder according to the present invention;

FIG. 2 is a schematic diagram of a main control board structure of the portable 485 line finder of the present invention;

FIG. 3 is a schematic structural diagram of a keypad of the portable 485 line finder of the present invention;

fig. 4 is a circuit schematic diagram of the portable 485 seeker of the present invention.

Description of the main element symbols:

1. a housing; 2. An LED lighting lamp;

3. LCD dot matrix screen; 4. Pressing a key;

5. a meter pen wiring hole; 6. A meter pen;

7. an LED lighting lamp; 8. 485 chips;

9. a single chip microcomputer; 10. A buzzer;

11. LCD screen and backlight.

Detailed Description

The technical solution 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. It is to be understood that the embodiments described are merely exemplary embodiments, rather than exemplary embodiments, and that all other embodiments may be devised by those skilled in the art without departing from the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the portable 485 line finder of the present invention includes a housing 1, a lithium battery, a main control panel, a key panel, and a stylus. The main control board comprises a lithium battery charging and discharging module, a linear voltage stabilizing circuit, a single chip microcomputer main control module, an LCD screen, a backlight circuit, an LED lighting module, a buzzer circuit and a 485 signal conversion module. The lithium battery, the main control board and the key board are all arranged in the shell, and the meter pen is inserted on the shell. The lithium battery is electrically connected with the main control board, the key board is electrically connected with the main control board, and the meter pen is electrically connected with the main control board.

As shown in fig. 1, the portable 485 line finder of the present invention has a handheld housing with a size of 80mm 165mm 31mm for easy carrying.

Portable 485 hunting appearance includes: the LED illuminating lamp comprises a shell 1, an LED illuminating lamp 2, an LCD dot matrix screen 3, a key 4, a meter pen wiring hole 5 and a meter pen 6.

Fig. 2 is a schematic diagram of a main control board structure of the portable 485 line finder.

The main control board is a low-power-consumption main board, the current of the motor is below 30uA, and the ultra-long standby function can be realized. The battery is a rechargeable lithium battery with the capacity of 2000mAh, and can realize cyclic charging. The charging and discharging module adopts a 4054 charging chip, and the charging current is set to be 500 mA. The linear voltage stabilizing circuit adopts a 3VLDO chip, the voltage of the battery is reduced to be stable 3V, and power is supplied to the single chip microcomputer 9, the LCD screen, the backlight 11, the LED lamp 7, the buzzer 10, the 485 chip 8 and the like.

The single chip microcomputer 8 is used for controlling the service logic of the whole product, and realizing 485 receiving and transmitting mode switching, signal transmission, signal analysis, LCD Chinese character display, buzzer sound control, LED illumination module work control, user key event receiving and the like.

The singlechip 8 can generate four paths of PWM signals with the periods of 3Hz and the duty ratios of 10%, 20%, 30% and 40% respectively as transmitting signals, and the signals are coupled to the 485 line to be detected through the 485 chip. And identifying different signals and 485 line polarity at a receiving end according to the duty ratio. Receiving 10% of PWM representative signal 1 with same phase at a receiving end, receiving 90% of PWM representative signal 1 with opposite phase at the receiving end, receiving 20% of PWM representative signal 2 with same phase at the receiving end, receiving 80% of PWM representative signal 2 with opposite phase at the receiving end, receiving 30% of PWM representative signal 3 with same phase at the receiving end, receiving 70% of PWM representative signal 3 with opposite phase at the receiving end, receiving 40% of PWM representative signal 4 with same phase at the receiving end, and receiving 60% of PWM representative signal 4 with opposite phase at the receiving end. The in-phase and reverse represent the 485 polarity in-phase and reverse, respectively. No signal is received at the receiving end, which represents that the 485 line is disconnected.

As shown in fig. 3, there are 6 keys on the keypad, which are defined as on-off, illumination, up, down, menu, and back, respectively. The control of the equipment can be realized through key operation.

As shown in fig. 4, the main control chip in the circuit is an HC32L136 series single chip microcomputer, which has good low power consumption performance. The model of the selected MOS tube is NP2302, and the buzzer BZ1 is controlled. The LED driving chip XT2016 is selected to control the illuminating lamp D1 and the LCD backlight. An XT4054 chip is selected as a charging chip to charge the lithium battery.

As shown in fig. 4, the circuit modules are electrically connected through the network label. The main control chip is connected to the buzzer module through a network label BZ of a 11 th pin to control the start and stop of the buzzer. The main control chip is connected to the charging module through a network label CHG of a 31 st pin, and detects the working state of the charging chip. The main control chip is connected to the LED lighting module through a network label LIGHT of an 18 th pin to control the on and off of the lighting LED. The main control chip is connected to the LCD backlight circuit through the network label LCDBL of the 32 th pin, and controls the on-off of the LCD backlight. The main control chip is connected to the LCD display circuit through network labels LCDCS, LCDRST, LCDA0, LCDSCL and LCDSDA of 39 th-43 th pins to control the display content of the LCD.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the equivalent replacement or change according to the technical solution and the modified concept of the present invention should be covered by the scope of the present invention.

Claims (8)

1. A portable 485 line finder, comprising: a shell, a power supply, a main control panel, a key board and a meter pen, which is characterized in that,

the power supply, the main control board and the key board are all arranged inside the shell, and the meter pen is inserted and fixed at the lower part of the shell;

the main control board is respectively electrically connected with the power supply, the key board and the meter pen;

the main control board includes: the charging and discharging module is electrically connected with a power supply; the linear voltage stabilizing circuit stabilizes the voltage provided by the charge-discharge module to 3V and supplies power to the singlechip main control module, the LCD screen and the 485 signal conversion module; the singlechip main control module is used for controlling the service logic of the whole product, and realizing 485 signal receiving and transmitting mode switching, signal transmission, signal analysis, LCD screen display and keypad signal receiving.

2. The portable 485 seeker of claim 1, wherein the power source is a rechargeable lithium battery.

3. The portable 485 line finder of claim 1, wherein the main control board carries an LED lighting module, and the LED lighting module is controlled by the main control module of the single chip microcomputer to operate.

4. The portable 485 line finder of claim 1, wherein a buzzer circuit is carried on the main control board, and the buzzer circuit is controlled to operate by a single-chip microcomputer main control module.

5. The portable 485 line finder as claimed in claim 1, wherein the LCD screen is a dot matrix screen capable of displaying chinese characters and dot matrix pictures.

6. The portable 485 line finder of claim 1, wherein the master control board is provided with a backlight circuit, and the operation of the backlight circuit is controlled by a single-chip microcomputer master control module.

7. The portable 485 seeker of claim 1, wherein the 485 signal conversion module is a bidirectional conversion circuit that can convert both a digital signal output by the single-chip microcomputer into a standard 485 signal and a standard 485 signal into a digital signal that can be recognized by the single-chip microcomputer.

8. The portable 485 seeker of claim 1 wherein said stylus comprises red and black styli, representing a and B, respectively, of the 485 signal.

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