Water meter water volume data acquisition device and system

Abstract

The embodiment of the utility model provides a water meter water volume data acquisition device and system. The water meter water volume data acquisition device comprises a control chip, a pull-up resistor and a first filter capacitor, the Hall element is used for sensing the magnetic flux change of the reading interface of the pulse water meter and carrying out corresponding conduction and pull-in to obtain the water metering pulse waveform of the pulse water meter; the pull-up resistor is used for carrying out pull-up operation on the I / O pin of the control chip; the first filter capacitor is used for filtering the water metering pulse waveform; and the control chip is used for determining the water consumption of the pulse water meter according to the filtered water metering pulse waveform. According to the device, the control chip is combined with the filter capacitor to be connected with the external Hall element, the Hall element is connected with the signal sending interface of the water meter, and the signal sending interface can generate magnetic flux change on the signal sending interface when the pointer of the water meter rotates, so that the Hall element is periodically switched on or switched off, and the water quantity is metered.

Description

Technical Field

[0001] The utility model relates to the technical field of instruments and meters, in particular to a water meter water quantity data acquisition device and system. Background Art

[0002] The current water meter installation process is inconvenient. Customers purchase a mechanical meter or one with 485 communication capabilities based on their needs. Construction workers or hired workers then install it in a designated pipe location. After installation, on-site staff collect and report meter data. They then configure parameters based on the meter type to accurately capture the customer's water usage.

[0003] The existing technology requires staff to be responsible for the installation of products across the country, which has requirements on the number of personnel and is troublesome to dispatch, resulting in low efficiency and high cost of water meter water volume data collection. Utility Model Content

[0004] The purpose of the utility model is to provide a water meter water quantity data collection device and system to alleviate the technical problem of high efficiency and low cost of water meter water quantity data collection, improve the efficiency of water meter water quantity data collection and reduce costs.

[0005] In the first aspect, an embodiment of the present invention provides a water meter water quantity data acquisition device, including: a control chip, a pull-up resistor and a first filter capacitor; one end of the above-mentioned pull-up resistor is connected to a power supply, and the other end of the above-mentioned pull-up resistor is connected to the above-mentioned first filter capacitor; one end of the above-mentioned first filter capacitor is grounded; one end of the connection between the above-mentioned pull-up resistor and the above-mentioned first filter capacitor is connected to the above-mentioned control chip; the other end of the connection between the above-mentioned pull-up resistor and the above-mentioned first filter capacitor is connected to an external Hall element; the above-mentioned Hall element is connected to the reading interface of the external pulse water meter; the above-mentioned Hall element is used to sense the magnetic flux changes of the above-mentioned reading interface of the above-mentioned pulse water meter, and perform corresponding conduction and attraction to obtain the water metering pulse waveform of the above-mentioned pulse water meter; the above-mentioned pull-up resistor is used to pull up the I / O pin of the above-mentioned control chip; the above-mentioned first filter capacitor is used to filter the above-mentioned water metering pulse waveform; the above-mentioned control chip is used to determine the water consumption of the above-mentioned pulse water meter based on the water metering pulse waveform after the above-mentioned filtering operation.

[0006] In a preferred embodiment of the present invention, the Hall element is arranged in the signal transmission line; the other end of the connection line between the pull-up resistor and the first filter capacitor is connected to the Hall element in the signal transmission line through an eight-core wire; and the Hall element is connected to the reading interface.

[0007] In a preferred implementation of the embodiment of the present utility model, the above-mentioned device also includes: an RS485 communication chip connected to the above-mentioned control chip; the above-mentioned RS485 communication chip is connected to the RS485 communication line of the external water meter with 485 communication function; the above-mentioned water meter with 485 communication function is used to send the water metering signal to the above-mentioned RS485 communication chip through the above-mentioned RS485 communication line; the above-mentioned RS485 communication chip is used to convert the above-mentioned water metering signal into a signal to be read by the above-mentioned control chip; the above-mentioned control chip is used to determine the water consumption of the above-mentioned water meter with 485 communication function based on the above-mentioned signal to be read.

[0008] In a preferred implementation manner of the embodiment of the present utility model, the A pin of the above-mentioned RS485 communication chip is connected to the first RS485 communication line of the above-mentioned water meter with 485 communication function through a first resettable fuse; the B pin of the above-mentioned RS485 communication chip is connected to the second RS485 communication line of the above-mentioned water meter with 485 communication function through a second resettable fuse; a TVS diode is connected between the first connection point between the above-mentioned RS485 communication chip and the above-mentioned first resettable fuse and the second connection point between the above-mentioned RS485 communication chip and the above-mentioned second resettable fuse; the above-mentioned first resettable fuse and the above-mentioned first resettable fuse are used to prevent electrostatic current between the above-mentioned RS485 communication chip and the above-mentioned water meter with 485 communication function; the above-mentioned TVS diode is used to eliminate voltage spikes between the above-mentioned RS485 communication chip and the above-mentioned water meter with 485 communication function.

[0009] In a preferred implementation manner of the embodiment of the present invention, the above-mentioned A pin and the above-mentioned B pin are respectively connected to one end of the first pull-down resistor and one end of the second pull-down resistor; the other end of the above-mentioned first pull-down resistor and the other end of the above-mentioned second pull-down resistor are both grounded.

[0010] In a preferred implementation of the embodiment of the present utility model, the above-mentioned device further includes: a power supply; and the power supply pin of the above-mentioned RS485 communication chip is connected to the above-mentioned power supply via a second filter capacitor.

[0011] In a preferred embodiment of the present invention, the above-mentioned device also includes: a first transistor; the emitter of the above-mentioned first transistor is connected to the receiver output end of the above-mentioned RS485 communication chip; the collector of the above-mentioned first transistor is connected to the receiving pin of the above-mentioned control chip; and the collector of the above-mentioned first transistor is connected to the above-mentioned power supply.

[0012] In a preferred embodiment of the present invention, the device further comprises: a second transistor; the collector of the second transistor is connected to both the receive enable terminal and the driver output enable terminal of the RS485 communication chip; the emitter of the second transistor is connected to the driver input terminal of the RS485 communication chip; the driver input terminal is connected to ground; the driver output enable terminal and the receive enable terminal are connected to the power supply.

[0013] In a preferred embodiment of the present invention, the model of the control chip is MG33M0610ER.

[0014] In a second aspect, an embodiment of the present utility model further provides a water meter water quantity data acquisition system, comprising: the above-mentioned water meter water quantity data acquisition device.

[0015] The embodiments of the present invention have the following beneficial technical effects:

[0016] An embodiment of the utility model provides a water meter water quantity data acquisition device and system, including: a control chip, a pull-up resistor and a first filter capacitor; one end of the pull-up resistor is connected to a power supply, and the other end of the pull-up resistor is connected to the first filter capacitor; one end of the first filter capacitor is grounded; one end of the connection between the pull-up resistor and the first filter capacitor is connected to the control chip; the other end of the connection between the pull-up resistor and the first filter capacitor is connected to an external Hall element; the Hall element is connected to the reading interface of the external pulse water meter; the Hall element is used to sense the magnetic flux changes of the reading interface of the pulse water meter, perform corresponding conduction and attraction, and obtain the water metering pulse waveform of the pulse water meter; the pull-up resistor is used to pull up the I / O pin of the control chip; the first filter capacitor is used to filter the water metering pulse waveform; the control chip is used to determine the water consumption of the pulse water meter based on the water metering pulse waveform after the filtering operation. The device connects to the peripheral Hall element through a control chip combined with a filter capacitor, and the Hall element is connected to the signal interface of the water meter. When the pointer of the water meter rotates, the magnetic flux on the signal interface will change, causing the Hall element to periodically turn on or off, thereby measuring the water volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic structural diagram of a water meter water quantity data acquisition device provided by an embodiment of the present utility model;

[0019] Figure 2 A schematic diagram of the connection between a water meter water quantity data acquisition device and a pulse water meter provided in an embodiment of the present utility model;

[0020] Figure 3 A schematic structural diagram of a second water meter water quantity data acquisition device provided by an embodiment of the present utility model;

[0021] Figure 4 A schematic diagram of the connection between a water meter water quantity data acquisition device and a water meter with 485 communication function provided by an embodiment of the present utility model;

[0022] Figure 5 The present invention provides a schematic structural diagram of a water meter water quantity data acquisition system according to an embodiment of the present invention.

[0023] Icons: 21-eight-core cable; 22-transmitting cable; 23-reading interface; 41-eight-core cable with 485 communication function; 42-water meter with 485 communication function; 51-water meter water volume data acquisition device; 52-water meter water volume data acquisition system. DETAILED DESCRIPTION

[0024] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] At present, after the water meter is installed, staff are required to be responsible for the installation of the product nationwide, which requires a certain number of personnel and is troublesome to dispatch, resulting in low efficiency and high cost in collecting water meter water volume data.

[0026] Based on this, the present invention provides a water meter water quantity data acquisition device and system. This device connects a peripheral Hall element to the water meter's signal transmission interface via a control chip combined with a filter capacitor. The Hall element is then connected to the water meter's signal transmission interface. Rotation of the water meter's pointer generates a change in magnetic flux at the signal transmission interface, causing the Hall element to periodically conduct or close, thereby measuring water quantity. To facilitate understanding, a water meter water quantity data acquisition device is first introduced.

[0027] Example 1

[0028] In this embodiment, the water meter water volume data acquisition device includes: a control chip, a pull-up resistor and a first filter capacitor; one end of the pull-up resistor is connected to a power supply, and the other end of the pull-up resistor is connected to the first filter capacitor; one end of the first filter capacitor is grounded; one end of the connection between the pull-up resistor and the first filter capacitor is connected to the control chip; the other end of the connection between the pull-up resistor and the first filter capacitor is connected to an external Hall element; the Hall element is connected to the reading interface of the external pulse water meter; the Hall element is used to sense the magnetic flux changes of the reading interface of the pulse water meter, perform corresponding conduction and attraction, and obtain the water metering pulse waveform of the pulse water meter; the pull-up resistor is used to pull up the I / O pin of the control chip; the first filter capacitor is used to filter the water metering pulse waveform; the control chip is used to determine the water consumption of the pulse water meter based on the water metering pulse waveform after the filtering operation.

[0029] Here, the above-mentioned Hall element is an omnipolar Hall element, and its model is: ocp1970.

[0030] For ease of understanding, Figure 1 The present invention provides a schematic structural diagram of a water meter water quantity data acquisition device according to an embodiment of the present invention.

[0031] Among them, the CHK-PULSE1 end in the structural diagram of the water meter water volume data acquisition device is connected to the above-mentioned control chip.

[0032] Further, by Figure 1 As can be seen in the figure, R1 is the pull-up resistor, C1 represents the first filter capacitor, S1 represents the Hall element, and the Hall element is used to sense the change in magnetic flux of the reading interface of the pulse water meter, and the corresponding conduction and attraction principle is represented by the three contacts of S1, namely Figure 1 1, 2, 3 of the above.

[0033] Furthermore, there may be multiple sub-circuits composed of the pull-up resistor, the first filter capacitor, and the Hall element, and the CHK-PULSE1 terminal of each sub-circuit is connected to the control chip.

[0034] Here, the model of the control chip is MG33M0610ER, and the number of the sub-circuits may be three.

[0035] In actual operation, the pulse water meter's dial, equipped with a magnetic pointer, rotates one full circle, corresponding to a rotation scale of 0 to 9. When the dial's magnetic pointer is between 4 and 7, the meter's magnet and Hall element are close relative to each other, sensing a significant change in magnetic flux at the meter's reading interface. The S1 switch is engaged, connecting channels 2 and 1, and CHK_PLUSE1 to GND, resulting in a low voltage level. When the dial's magnetic pointer is at other scale positions, the magnet and Hall element are farther apart, sensing a smaller change in magnetic flux at the meter's reading interface. The S1 switch is disconnected, connecting channels 2 and 3, and CHK_PLUSE1 to the 3.0V power supply, resulting in a high voltage level. Therefore, the control chip can determine the pulse signal input based on the voltage level change at the CHK_PLUSE1 pin, with a complete high voltage level followed by a complete low voltage level being counted as a pulse.

[0036] Further, Figure 2 A schematic diagram of the connection between a water meter water quantity data acquisition device and a pulse water meter provided in an embodiment of the utility model.

[0037] Depend on Figure 2 As can be seen, the Hall element is arranged in the signal transmission line 22; the other end of the connection line between the pull-up resistor and the first filter capacitor is connected to the Hall element in the signal transmission line 22 through the eight-core wire 21; the Hall element is connected to the reading interface 23.

[0038] In actual operation, the water meter water quantity data acquisition device monitors the levels of multiple pulse pins in real time via the CHK_PULSE pin on the control chip. When regular level changes occur repeatedly, the device monitors the pulse waveform of each pin and sets the unchanged pins to a high level by default. Therefore, the type of connected pulse water meter can be determined based on the level changes detected on each pulse pin. This means that the device can collect water meter pulse waveforms from three types of pulse water meters: single pulse, double pulse, and triple pulse.

[0039] Further, Figure 3 This is a structural diagram of a second water meter water quantity data acquisition device provided in an embodiment of the present utility model.

[0040] Depend on Figure 3As can be seen, the above-mentioned device also includes: an RS485 communication chip connected to the above-mentioned control chip; the above-mentioned RS485 communication chip is connected to the RS485 communication line of the external water meter with 485 communication function; the above-mentioned water meter with 485 communication function is used to send the water metering signal to the above-mentioned RS485 communication chip through the above-mentioned RS485 communication line; the above-mentioned RS485 communication chip is used to convert the above-mentioned water metering signal into a signal to be read by the above-mentioned control chip; the above-mentioned control chip is used to determine the water consumption of the above-mentioned water meter with 485 communication function based on the above-mentioned signal to be read.

[0041] Specifically, the A pin of the RS485 communication chip is connected to the first RS485 communication line of the water meter with 485 communication function through a first resettable fuse; the B pin of the RS485 communication chip is connected to the second RS485 communication line of the water meter with 485 communication function through a second resettable fuse; a TVS diode is connected between the first connection point between the RS485 communication chip and the first resettable fuse and the second connection point between the RS485 communication chip and the second resettable fuse; the first resettable fuse and the first resettable fuse are used to prevent electrostatic current between the RS485 communication chip and the water meter with 485 communication function; the TVS diode is used to eliminate voltage spikes between the RS485 communication chip and the water meter with 485 communication function.

[0042] Furthermore, the A pin and the B pin are connected to one end of a first pull-down resistor and one end of a second pull-down resistor respectively; the other end of the first pull-down resistor and the other end of the second pull-down resistor are both grounded.

[0043] Furthermore, the above device also includes: a power supply; the power supply pin of the above RS485 communication chip is connected to the above power supply through a second filter capacitor.

[0044] Furthermore, the other end of the second filter capacitor is grounded.

[0045] Furthermore, the above-mentioned device also includes: a first transistor; the emitter of the above-mentioned first transistor is connected to the receiver output end of the above-mentioned RS485 communication chip; the collector of the above-mentioned first transistor is connected to the receiving pin of the above-mentioned control chip; and the collector of the above-mentioned first transistor is connected to the above-mentioned power supply.

[0046] Furthermore, the above-mentioned device also includes: a second transistor; the collector of the above-mentioned second transistor is connected to the receive enable terminal and the driver output enable terminal of the above-mentioned RS485 communication chip; the emitter of the above-mentioned second transistor is connected to the driver input terminal of the above-mentioned RS485 communication chip; the above-mentioned driver input terminal is connected to the ground; the above-mentioned driver output enable terminal and the above-mentioned receive enable terminal are connected to the above-mentioned power supply.

[0047] In this embodiment, Figure 3 Here, F1 is the first resettable fuse, F2 is the second resettable fuse, TVS1 is the TVS diode, R3 is the first pull-down resistor, R4 is the second pull-down resistor, C2 is the second filter capacitor, V1 is the first transistor, and V2 is the second transistor.

[0048] In actual operation, the water meter water volume data acquisition device and the water meter with 485 communication function may generate static electricity when connected, and the digital recovery fuse prevents large current from occurring in the circuit; the TVS diode plays a protective role like the fuse; the pull-down resistor pulls down the 485A and 485B channel voltages of U1 to a low level when there is no external signal; the second filter capacitor filters out 5V noise and stabilizes the input voltage; U1 is an RS485 communication chip, model MAX487ESA, which is a low-power transceiver for RS485 communication, accepting external signal input through A and B pins, RE is the receive enable pin, DE is the send enable pin, when the DE pin is high, the send is enabled, and only the signal is sent to MG33M0610. The ER chip does not receive the signal sent by the MG33M0610ER chip. When the RE pin is at a low level, reception is enabled and it only receives the signal sent by the MG33M0610ER chip, but does not send any signal to the MG33M0610ER chip. The R2 pull-up resistor sets the voltage of the microcontroller I / O port to 3.0V. The MG33M0610ER chip requires a 3.0V voltage for communication. 485_RXD and 485_TXD are connected to the serial port of the MG33M0610ER chip. 485_RXD receives the level signal sent after conversion by U1, and 485_TXD sends the level signal output by the MG33M0610ER chip to U1. V1 and V2 are transistors, which are level conversion devices that control the level signal.

[0049] For ease of understanding, Figure 4 This is a schematic diagram of the connection between a water meter water quantity data acquisition device and a water meter with 485 communication function provided by an embodiment of the utility model.

[0050] Depend on Figure 4 As can be seen, the water meter water volume data acquisition device 51 is also connected to the water meter 42 with 485 communication function through an eight-core cable 41 with 485 communication function.

[0051] An embodiment of the utility model provides a water meter water quantity data acquisition device, comprising: a control chip, a pull-up resistor and a first filter capacitor; one end of the pull-up resistor is connected to a power supply, and the other end of the pull-up resistor is connected to the first filter capacitor; one end of the first filter capacitor is grounded; one end of the connection between the pull-up resistor and the first filter capacitor is connected to the control chip; the other end of the connection between the pull-up resistor and the first filter capacitor is connected to an external Hall element; the Hall element is connected to the reading interface of an external pulse water meter; the Hall element is used to sense the magnetic flux changes of the reading interface of the pulse water meter, perform corresponding conduction and attraction, and obtain the water metering pulse waveform of the pulse water meter; the pull-up resistor is used to pull up the I / O pin of the control chip; the first filter capacitor is used to filter the water metering pulse waveform; the control chip is used to determine the water consumption of the pulse water meter based on the water metering pulse waveform after the filtering operation. The device connects to the peripheral Hall element through a control chip combined with a filter capacitor, and the Hall element is connected to the signal interface of the water meter. When the pointer of the water meter rotates, the magnetic flux on the signal interface will change, causing the Hall element to periodically turn on or off, thereby measuring the water volume.

[0052] Example 2

[0053] Based on the above embodiments, Figure 5 The present invention provides a schematic structural diagram of a water meter water quantity data acquisition system according to an embodiment of the present invention.

[0054] Depend on Figure 5 As can be seen, the water meter water quantity data acquisition system 52 includes: the water meter water quantity data acquisition device 51 in the above embodiment.

[0055] The water meter water quantity data collection system provided in this embodiment has the same technical features as the water meter water quantity data collection device provided in the aforementioned embodiment 1, and therefore can solve the same technical problems and achieve the same technical effects. Those skilled in the art will clearly understand that for ease and brevity of description, the specific operating process of the system described above can refer to the corresponding structure of the device in the aforementioned embodiment 1, and will not be repeated here.

[0056] In the description of the utility model, it needs to be explained that, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the utility model product when it is usually placed, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0057] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical scheme of the utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, ordinary skilled in the art should understand that: it can still modify the technical scheme recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the utility model.

Claims

1. A water meter water quantity data acquisition device, characterized in that: include: A control chip, a pull-up resistor, and a first filter capacitor; one end of the pull-up resistor is connected to a power supply, and the other end of the pull-up resistor is connected to the first filter capacitor; one end of the first filter capacitor is grounded; one end of the connection between the pull-up resistor and the first filter capacitor is connected to the control chip; the other end of the connection between the pull-up resistor and the first filter capacitor is connected to an external Hall element; the Hall element is connected to a reading interface of an external pulse water meter; The Hall element is used to sense the change of magnetic flux of the reading interface of the pulse water meter, and perform corresponding conduction and attraction to obtain the water metering pulse waveform of the pulse water meter; The pull-up resistor is used to pull up the I / O pin of the control chip; The first filter capacitor is used to filter the water metering pulse waveform; The control chip is used to determine the water consumption of the pulse water meter according to the water metering pulse waveform after the filtering operation.

2. The water meter water quantity data acquisition device according to claim 1, characterized in that: The Hall element is arranged in the signal transmission line; the other end of the connection line between the pull-up resistor and the first filter capacitor is connected to the Hall element in the signal transmission line through an eight-core wire; and the Hall element is connected to the reading interface.

3. The water meter water quantity data acquisition device according to claim 1, characterized in that: The device further comprises: an RS485 communication chip connected to the control chip; the RS485 communication chip is connected to an RS485 communication line of an external water meter with 485 communication function; The water meter with 485 communication function is used to send the water metering signal to the RS485 communication chip through the RS485 communication line; The RS485 communication chip is used to convert the water metering signal into a signal to be read by the control chip; The control chip is used to determine the water consumption of the water meter with 485 communication function based on the signal to be read.

4. The water meter water quantity data acquisition device according to claim 3, characterized in that: The A pin of the RS485 communication chip is connected to the first RS485 communication line of the water meter with 485 communication function through a first resettable fuse; the B pin of the RS485 communication chip is connected to the second RS485 communication line of the water meter with 485 communication function through a second resettable fuse; a TVS diode is connected between a first connection point between the RS485 communication chip and the first resettable fuse and a second connection point between the RS485 communication chip and the second resettable fuse; The first resettable fuse and the second resettable fuse are used to prevent static current between the RS485 communication chip and the water meter with 485 communication function; The TVS diode is used to eliminate voltage spikes between the RS485 communication chip and the water meter with 485 communication function.

5. The water meter water quantity data acquisition device according to claim 4, characterized in that: The A pin and the B pin are connected to one end of a first pull-down resistor and one end of a second pull-down resistor respectively; the other end of the first pull-down resistor and the other end of the second pull-down resistor are both grounded.

6. The water meter water quantity data acquisition device according to claim 5, characterized in that: The device further comprises: a power supply; a power supply pin of the RS485 communication chip is connected to the power supply via a second filter capacitor.

7. The water meter water quantity data acquisition device according to claim 6, characterized in that: The device also includes: a first transistor; the emitter of the first transistor is connected to the receiver output end of the RS485 communication chip; the collector of the first transistor is connected to the receiving pin of the control chip; and the collector of the first transistor is connected to the power supply.

8. The water meter water quantity data acquisition device according to claim 7, characterized in that: The device also includes: a second transistor; the collector of the second transistor is connected to the receive enable terminal and the driver output enable terminal of the RS485 communication chip; the emitter of the second transistor is connected to the driver input terminal of the RS485 communication chip; the driver input terminal is connected to ground; the driver output enable terminal and the receive enable terminal are connected to the power supply.

9. The water meter water quantity data acquisition device according to claim 3, characterized in that: The model of the control chip is MG33M0610ER.

10. A water meter water quantity data acquisition system, characterized in that: include: The water meter water quantity data acquisition device according to any one of claims 1 to 9.

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