RS485 communication module and data monitoring device

Abstract

The utility model relates to an RS485 communication module and a data monitoring device, and relates to the technical field of communication. In the RS485 communication module, an isolation belt is used for electrically isolating a controller side circuit and a bus side circuit; the controller side circuit comprises a driver and a primary side grounding pin, the driver is used for converting a digital signal into a differential signal, and the primary side grounding pin is used for realizing grounding of the controller side circuit; the bus side circuit comprises a receiver and a secondary side grounding pin, the receiver is used for converting a differential signal into a digital signal, and the secondary side grounding pin is used for realizing grounding of the bus side circuit; the two ends of the filter circuit are connected with the primary side grounding pin and the secondary side grounding pin respectively, and the filter circuit is located in the isolation range corresponding to the isolation strip. According to the RS485 communication module, the effects that the influence on the receiving sensitivity of the cellular network module is reduced, the data transmission quality is improved, and the application scene of the RS485 communication module is expanded are achieved.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and particularly to an RS485 communication module and a data monitoring device. Background Art

[0002] The RS485 communication module is a communication component designed specifically for the industrial control and automation fields, aiming to provide reliable serial data transmission while ensuring electrical isolation to enhance the system's security, stability, and anti-interference capabilities. Due to its advantages such as electrical isolation, integrated design, strong anti-interference ability, and wide operating temperature range, it has good application prospects in data monitoring devices. For example, in power monitoring systems, especially in communication between PLC (Power Line Communicaon) modules, it has many applications.

[0003] In a data monitoring device, not only is an RS485 communication module integrated to receive data collected by data acquisition devices, but other remote communication modules (such as cellular network modules) also need to be configured to send the collected data to a terminal (such as a cloud terminal) so that the collected data can be displayed on the interface of the terminal device, facilitating operators to more intuitively observe the operating conditions of the monitored devices.

[0004] Since the RS485 communication module and the cellular network module operate in different frequency ranges, generally speaking, the above-mentioned RS485 communication module will not affect the signal reception of the cellular network module. However, if the RS485 communication module performs signal amplification processing during operation, the processed signal will affect the receiving sensitivity (TIS, Total Isotropic Sensitivity) of the cellular network module.

[0005] Regarding the above problems in the related art, no effective solutions have been proposed yet. Summary of the Utility Model

[0006] An RS485 communication module and a data monitoring device provided by an embodiment of the present utility model at least solve the problem in the related art that the operation of the RS485 communication module reduces the receiving sensitivity of the cellular network module, affects the data transmission quality and data transmission efficiency in the data monitoring device, and further leads to poor monitoring and maintenance effects on the operating conditions of the monitored devices.

[0007] To solve the above problems, in one aspect of an embodiment of the present utility model, an RS485 communication module is provided, including: a controller-side circuit, a bus-side circuit, an isolation belt, and a filtering circuit; wherein,

[0008] The isolation belt is located between the controller-side circuit and the bus-side circuit and is used for electrically isolating the controller-side circuit and the bus-side circuit;

[0009] The controller - side circuit includes a driver and a primary - side ground pin; wherein, the driver is used to convert digital signals into differential signals, and the primary - side ground pin is used to ground the controller - side circuit;

[0010] The bus - side circuit includes a receiver and a secondary - side ground pin; wherein, the receiver is used to receive differential signals and convert the differential signals into digital signals, and the secondary - side ground pin is used to ground the bus - side circuit;

[0011] One end of the filter circuit is connected to the primary - side ground pin, the other end is connected to the secondary - side ground pin, and the filter circuit is located within the electrical isolation range corresponding to the isolation belt.

[0012] In some of these embodiments, the signal frequency point filtered by the filter circuit is 420 MHz.

[0013] In some of these embodiments, the filter circuit includes at least one first capacitor, and the first capacitor is located within the electrical isolation range corresponding to the isolation belt; wherein, when there are multiple first capacitors, the multiple first capacitors are connected in parallel.

[0014] In some of these embodiments, the filter circuit includes a first resistor and a second capacitor connected in series.

[0015] In some of these embodiments, the controller - side circuit further includes a control pin and a power - connection pin. One end of the control pin is connected to an external controller via a drive - control circuit, the other end is connected to the driver, and the power - connection pin is connected to an external primary - side power supply; wherein,

[0016] The drive - control circuit includes two signal lines, at least one second resistor, and at least one third capacitor; wherein, one end of the signal line is connected to the control pin, the other end is connected to the controller; the second resistor is connected in parallel between the signal line and the power bus connecting the external primary - side power supply and the power - connection pin; one end of the third capacitor is connected to the power bus, and the other end is connected to the primary - side ground pin.

[0017] In some of these embodiments, the bus - side circuit further includes a secondary - side power - connection pin and a differential - signal pin. One end of the differential - signal pin is connected to the RS485 bus, the other end is connected to the receiver, and the secondary - side power - connection pin is used to connect to an external secondary - side power supply.

[0018] To solve the above problems, in one aspect of the embodiments of the present utility model, there is provided a data monitoring device, including a cellular network module and any one of the above - mentioned RS485 communication modules; wherein,

[0019] The data monitoring device is connected to the data acquisition device based on the communication interface of the RS485 communication module, and is used to receive the acquisition data sent by the data acquisition device;

[0020] The data monitoring device is connected to the terminal device via the cellular network device, and is used to send the acquisition data to the terminal device.

[0021] In some embodiments, the number of RS485 communication modules is multiple, and the multiple RS485 communication modules are respectively connected to the data acquisition device and the energy storage machine.

[0022] In some embodiments, the data monitoring device further includes a WiFi module and / or an Ethernet module, and the data monitoring device is connected to the terminal device via the WiFi module and / or the Ethernet module.

[0023] The beneficial effects of the embodiments of the present utility model: By adding a filtering circuit in the RS485 communication module, one end of the filtering circuit is connected to the primary side grounding pin, the other end is connected to the secondary side grounding pin, and the filtering circuit is located within the electrical isolation range corresponding to the isolation belt. Without affecting the electrical isolation between the primary and secondary sides of the RS485 communication module, the filtering processing via the filtering circuit overcomes the influence on the receiving sensitivity of the cellular network module caused by the operation of the RS485 communication module in the related art. In the data monitoring device, both the RS485 communication module and the cellular network communication module can be used, and the data transmission quality and data transmission effect of the two communication modules are ensured. Furthermore, the monitoring effect and maintenance effect on the operating conditions of the monitored device are improved, and the technical effect of expanding the application scenario of the RS485 communication module is achieved.

[0024] Details of one or more embodiments of the present utility model are presented in the following drawings and description to make other features, objectives, and advantages of the present utility model more concise and understandable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other embodiments can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic diagram of the main framework of the RS485 communication module in an embodiment of the embodiments of the present utility model.

[0027] Figure 2 It is a circuit topology diagram of the RS485 communication module in another embodiment of the embodiments of the present utility model.

[0028] Figure 3 It is a functional module framework diagram of a data monitoring device according to an embodiment of the present utility model. Detailed implementation manners

[0029] Embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. Although some embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present utility model. It should be understood that the drawings and embodiments of the present utility model are only for exemplary purposes and are not used to limit the protection scope of the present utility model.

[0030] RS485: It is a serial communication interface standard that is widely used in many fields such as industrial automation, building control, security systems, instrument and sensor networks. RS485 uses a differential signal transmission method, that is, two wires (usually called wire A and wire B) are used to transmit signals, and the voltage of one wire changes relative to the other wire. This mechanism improves the anti-interference ability of the signal and is suitable for data transmission in long-distance and noisy environments. RS485 supports multi-point communication, that is, a master device can form a bus-type network with up to 32 (theoretically more, but limited by specific device and network conditions) slave devices, and all devices share the same pair of signal lines for two-way communication.

[0031] The RS485 communication module is a component designed to improve the stability and security of the communication system, and it uses the RS485 serial communication interface for signal transmission. The RS485 communication module reduces the impact of external electromagnetic interference (EMI) on the communication quality based on the isolation belt, and can also protect the device from high-voltage damage, improving the system security.

[0032] PLC (Power Line Communication, power line carrier communication module): It refers to a communication module that uses power lines as a carrier to transmit data and other information. This is a technology that allows data signals to "ride" on power lines, enabling power lines to not only transmit power but also transmit control signals or data communication simultaneously, and is widely used in many fields such as remote measurement, automation control, and smart homes.

[0033] The data monitoring device is an integrated monitoring and management system used to control and optimize the operation of facilities. It can be applied to a variety of data monitoring scenarios. The data monitoring device integrates an RS485 communication module for data transmission with data acquisition devices, and also integrates communication modules such as 4G, WiFi, and Ethernet for remote communication.

[0034] Since the data monitoring device not only integrates an RS485 communication module to receive the data information collected by the data acquisition device, but also needs to configure other remote communication modules (such as a cellular network module) to send the collected data information to a terminal (such as a cloud terminal). Therefore, if the RS485 communication module performs signal amplification processing during operation, the processed signal will affect the reception sensitivity of the cellular network module, and further affect the data transmission efficiency and data transmission quality of the data monitoring device.

[0035] To solve the above problems, an embodiment of the present invention provides an RS485 communication module, as Figure 1 shown. The RS485 communication module mainly includes: a controller side circuit, a bus side circuit, an isolation belt, and a filtering circuit; wherein, the isolation belt is located between the controller side circuit and the bus side circuit for electrically isolating the controller side circuit and the bus side circuit; the controller side circuit includes a driver and a primary ground pin; wherein, the driver is used to convert a digital signal into a differential signal, and the primary ground pin is used to ground the controller side circuit; the bus side circuit includes a receiver and a secondary ground pin; wherein, the receiver is used to receive the differential signal and convert the differential signal into a digital signal, and the secondary ground pin is used to ground the bus side circuit; one end of the filtering circuit is connected to the primary ground pin, and the other end is connected to the secondary ground pin, and the filtering circuit is located within the electrical isolation range corresponding to the isolation belt.

[0036] Among them, the controller side circuit provided by the embodiment of the present invention is the primary circuit of the RS485 communication module, and the bus side circuit is the secondary circuit of the RS485 communication module.

[0037] The above isolation belt can use an optocoupler, a magnetic coupler, a digital isolator, or a capacitive coupler, etc. to isolate the DC electrical path between the primary side and the secondary side, and at the same time allow AC or modulated signals to pass through, so as to achieve data transmission. According to a specific implementation manner of the embodiment of the present invention, the isolation belt can be an isolation belt on the PCB (Printed Circuit Board) corresponding to the RS485 communication module where no copper foil or wire is arranged.

[0038] In some of the embodiments, the above controller side circuit further includes a control pin and a power connection pin. One end of the control pin is connected to an external controller via a drive control circuit, and the other end is connected to the driver. The power connection pin is connected to an external power supply on the primary side; the bus side circuit further includes a differential signal pin. One end of the differential signal pin is connected to the RS485 bus, and the other end is connected to the receiver. As Figure 2As shown, the control pins DE (Data Enable) and RE (Receiver Enable) are used to enable or disable the driver and receiver. Through these pins, the controller can control when the chip sends data (by setting DE to high level) and when it is ready to receive data (usually achieved by controlling RE, although in some applications RE may be directly grounded or connected to VCC to keep it always on). VCC1 is the power connection pin for connecting to the primary external power supply, and GND1 is the primary ground pin for grounding the primary circuit. The differential signal pins A and B are also called the Non-Inverting and Inverting pins. The connection lines between the differential signal pins and the receiver carry the differential signal, that is, the signal represents the logical state through the voltage difference between the connection lines. The receiver determines the signal on the bus by monitoring the voltage difference between this pair of differential signal pins. Such a differential signal design can effectively improve the anti-interference ability of the signal, making RS485 very suitable for communication in long-distance and noisy environments.

[0039] Through the above settings, a filter circuit is added to the RS485 communication module. On the one hand, one end of the filter circuit is connected to the primary ground pin, and the other end is connected to the secondary ground pin. Accordingly, the filter circuit can effectively suppress the electromagnetic interference (EMI) and radio frequency interference (RFI) coupled in through the ground wire or power line, thereby ensuring the accuracy of data transmission, reducing error codes, and the filter circuit can filter and reduce the noise of the signal frequency after frequency doubling processing during the operations of signal amplification, shaping, differential sending and receiving of the RS485 communication module, so as to reduce the influence of the RS485 communication module on the receiving sensitivity (TIS, Total Isotropic Sensitivity) of the cellular network module, ensuring that the receiving sensitivity of the cellular network module is maintained at a relatively high level, ensuring the data transmission quality and data transmission efficiency of the cellular network module, thus achieving the technical effect of expanding the application scenarios of the RS485 communication module.

[0040] On the other hand, the filter circuit is located within the electrical isolation range corresponding to the isolation band, which neither affects the electrical isolation between the primary and secondary sides of the RS485 communication module nor can serve as a protection barrier to prevent instantaneous high voltage or surges from entering the sensitive circuit parts, such as the controller-side circuit, through the ground wire, thus protecting the RS485 chip and its peripheral circuits from damage.

[0041] According to the embodiments of the present utility model, a good grounding connection is established in the above RS485 communication module through the primary side grounding pin and the secondary side grounding pin. By additionally providing a filtering circuit, the stability of the grounding loop can be improved more effectively, the interference caused by the ground loop current can be reduced, and the purity of the differential signal (such as that used in RS485 communication) can be increased. Moreover, the filtering circuit helps to remove high-frequency noise, enabling the differential signal to remain clear during transmission, improving the signal integrity, and facilitating high-speed data transmission and long-distance communication.

[0042] In some of these embodiments, the signal frequency point filtered by the filtering circuit is 420 MHz.

[0043] The embodiments of the present utility model mainly set the filtering circuit in view of the influence of the RS485 communication module on the receiving sensitivity of the cellular network module during operation. Therefore, the signal frequency point filtered by the filtering circuit needs to correspond to the signal frequency band of the cellular network module. It should be noted that the frequency range of the cellular network is roughly between 400 MHz and 3 GHz, but this does not mean that all frequencies within this range will be used for cellular communication. The range of the signal frequency point or signal frequency band corresponding to the filtered signal can be adaptively adjusted according to the actual application scenario of RS485.

[0044] In some of these embodiments, the above filtering circuit includes at least one first capacitor, and the first capacitor is located within the electrical isolation range corresponding to the isolation band; wherein, when there are multiple first capacitors, the multiple first capacitors are connected in parallel.

[0045] Figure 2 Fig. shows a circuit topology schematic diagram of an RS485 communication module according to an embodiment of the embodiments of the present utility model, as Figure 2 shown, the filtering circuit may include a capacitor (see the capacitor C41 in Figure 2 ). It should be noted that the number of first capacitors in the filtering circuit can be adaptively adjusted according to one or more factors such as the capacitance value of the first capacitor, device cost, filtering effect, and characteristic frequency response. It can be understood that when higher filtering efficiency or a specific frequency response is required, a method of connecting multiple first capacitors in parallel can be adopted. The multiple first capacitors connected in parallel can effectively increase the overall capacitance value, which helps to provide a better filtering effect in a lower frequency range because the larger the capacitance value, the stronger the bypass ability for low-frequency signals.

[0046] Meanwhile, since each capacitor has its own capacitance value and equivalent series resistance (ESR), paralleling capacitors of different specifications can optimize the performance of the filter across the entire frequency spectrum, especially for applications that require maintaining good filtering performance over a wide frequency range. Also, different capacitor materials (such as ceramic, tantalum, aluminum electrolytic, etc.) have different temperature coefficients. By paralleling different types of capacitors, the impact of temperature changes on the capacitance value can be balanced to a certain extent, thereby improving the temperature stability of the entire filtering circuit. Exemplarily, in some application scenarios with high reliability requirements, paralleling multiple capacitors can provide redundancy. Even if one capacitor fails, the entire filtering circuit can still continue to operate, thus improving the overall reliability of the system. According to a specific implementation manner of an embodiment of the present invention, multiple first capacitors connected in parallel in the filtering circuit can reduce the equivalent series resistance (ESR) and equivalent series inductance (ESL) of the entire filtering network, which is particularly important for high-speed signal transmission because it can reduce signal distortion and delay and improve signal integrity.

[0047] In some of these embodiments, the filtering circuit includes a first resistor and a second capacitor connected in series.

[0048] Based on the above settings, another type of filtering circuit is provided, namely an RC filtering circuit composed of a first resistor (commonly referred to as a damping resistor) and a second capacitor connected in series. Among them, the main function of the first resistor (series resistor) is to provide a damping effect to make the output signal smoother and stabilize the operating state of the system. The RC filtering circuit can form a low-pass filter, that is, it allows low-frequency signals to pass through while attenuating high-frequency signals, thereby effectively reducing the impact of the operation of the RS485 communication module on the receiving sensitivity of the cellular network module. In addition, the above-mentioned series resistor also plays a role in current limiting, which can prevent sudden large current surges from damaging the capacitor or other backend circuits. In the power filtering application scenario, it can help control the charging rate of the capacitor and avoid false operation of power or circuit protection caused by the current surge when a large-capacity capacitor is powered on. Exemplarily, in some application scenarios, such as the power input filtering scenario, the series resistor can reduce the Q value (quality factor) of the circuit, thereby reducing the sensitivity of the circuit to specific frequencies and improving the stability of the system.

[0049] By adopting the above RC filtering circuit, high-frequency noise can be filtered out, protecting the backend sensitive circuit from the influence of high-frequency interference and improving the purity of the signal and the reliability of the system.

[0050] In some of these embodiments, such as Figure 2As shown, the above-mentioned drive control circuit includes two signal lines, at least one second resistor, and at least one third capacitor; wherein, one end of the signal line is connected to the control pin, and the other end is connected to the controller; the second resistor is connected in parallel between the signal line and the power bus connecting the external power supply and the power connection pin; one end of the third capacitor is connected to the power bus, and the other end is connected to the primary ground pin.

[0051] In the above-mentioned drive control circuit, the second resistor (usually called a pull-up or pull-down resistor, depending on the specific connection method) is connected in parallel between the signal line and the power bus, which can limit the current on the signal line, prevent instantaneous high voltage or surges from entering the controller through the signal line, and protect the input port of the controller from damage. At the same time, the pull-up or pull-down resistor also helps to pull the signal line to a known default voltage level (usually high level or low level) when there is no valid signal, which can prevent signal drift, ensure the clarity and integrity of the signal, and reduce the possibility of misreading. The third capacitor (usually called a decoupling capacitor or bypass capacitor) is connected between the power bus and the ground, which can provide local transient energy storage, quickly respond to the instantaneous change of current in the circuit, reduce the influence of power supply noise on the signal line, filter out the high-frequency noise on the power line, ensure the stability of the power supply voltage, and improve the anti-interference ability of the entire circuit. Through the combined use of the above resistors and capacitors, not only can the stable and safe transmission of the drive signal be ensured, but also the influence of power supply ripple on the circuit operation can be reduced, the ground bounce phenomenon can be reduced, and the stability and reliability of the system can be improved.

[0052] In some of the embodiments, such as Figure 2 As shown, the above-mentioned bus-side circuit further includes a secondary power connection pin, and the secondary power connection pin is used to connect to the secondary external power supply.

[0053] Through the above settings, the bus-side circuit (i.e., the secondary side of the RS485 communication module) is connected to the secondary external power supply via the secondary power connection pin, so that independent power connections are used between the primary controller side and the secondary side (bus side) of the RS485 communication module, so that the power supply noise of the secondary side circuit will not directly affect the controller side circuit, and vice versa, improving the stability and safety of the system, which is particularly important in applications in high-voltage or noisy environments. According to the embodiments of the present invention, on the one hand, the secondary power connection pin allows the bus-side circuit to use different power supplies according to actual needs. For example, when the main system power supply is unstable or a special voltage level needs to be provided for the bus side, a suitable power supply can be independently selected, increasing the flexibility and adaptability of system design. On the other hand, in a complex system, if there is a power supply problem on one side, the independent power configuration can limit the scope of the fault impact, prevent the entire system from being paralyzed due to a single-point fault, and facilitate fault troubleshooting and maintenance.

[0054] In some of these embodiments, since the influence on the receiving sensitivity of the cellular network module is caused by the signal processing performed by the RS485 communication module during operation, other models of RS485 communication modules can also be used, as long as the operating frequency points of this model of RS485 communication module do not affect the receiving sensitivity of the cellular network module.

[0055] During the frequency doubling process of the signal frequency by the RS485 communication module, the influence degrees of signals in different frequency ranges on the receiving sensitivity of the cellular network module are different. The above provides another model of the RS485 communication module that reduces the influence on the receiving sensitivity of the cellular network module. This model of the RS485 communication module can also reduce the influence on the receiving sensitivity of the cellular network module, ensure the data transmission quality and data transmission effect of the two communication modules, and further improve the monitoring effect and maintenance effect on the operating conditions of the monitored device.

[0056] For the above RS485 communication module provided by the embodiments of the present invention, since a filtering circuit is added in the RS485 communication module, one end of the filtering circuit is connected to the primary side ground pin, the other end is connected to the secondary side ground pin, and the filtering circuit is located within the electrical isolation range corresponding to the isolation band. While not affecting the electrical isolation between the primary and secondary sides of the RS485 communication module, the filtering process via the filtering circuit overcomes the influence on the receiving sensitivity of the cellular network module caused by the operation of the RS485 communication module in the related art. It realizes that in the data monitoring device, both the RS485 communication module and the cellular network communication module can be used, ensures the data transmission quality and data transmission effect of the two communication modules, and further improves the monitoring effect and maintenance effect on the operating conditions of the monitored device, achieving the technical effect of expanding the application scenario of the RS485 communication module.

[0057] The embodiments of the present invention also provide a data monitoring device, as Figure 3 shown. The data monitoring device provided by the embodiments of the present invention mainly includes: a cellular network module and any one of the above RS485 communication modules; wherein, the data monitoring device is connected to the data acquisition device based on the communication interface of the RS485 communication module and is used to receive the acquisition data sent by the data acquisition device; the data monitoring device is connected to the terminal device via the cellular network device and is used to send the acquisition data to the terminal device.

[0058] As Figure 3As shown, the data monitoring device includes a cellular network module and an RS485 communication module. Since the RS485 communication module with the added filter circuit is adopted in the data monitoring device, when the RS485 communication module works, the influence on the receiving sensitivity of the cellular network module is small, effectively ensuring the data transmission quality and data transmission effect of the cellular network module.

[0059] According to the embodiment of the present invention, the above data monitoring device integrates a cellular network module and an RS485 communication module at the same time. The RS485 communication module effectively prevents ground loop interference and high-voltage impact through electrical isolation and a filter circuit, protecting the control device and data acquisition equipment from electrical damage, improving the communication stability and the overall reliability of the system. At the same time, the added filter circuit further filters out high-frequency noise and electromagnetic interference, ensuring the accuracy of data transmission and avoiding the influence on the receiving sensitivity of the cellular network module. Accordingly, it is possible to use both RS485 communication technology and cellular network communication technology for data transmission, while also ensuring the data transmission quality and data transmission effect of the two communication modules, further improving the monitoring effect and maintenance effect on the operating conditions of the monitored equipment.

[0060] In some of the embodiments, the number of RS485 communication modules is multiple, and the multiple RS485 communication modules are respectively connected to a data acquisition device and an energy storage machine.

[0061] Through the above settings, the applicable scenarios of the data monitoring device are further expanded.

[0062] As Figure 3 shown, the data monitoring device also integrates a WiFi module and an Ethernet module (Etherent), thereby providing more types of data transmission methods.

[0063] The above data monitoring device provided by the embodiment of the present invention integrates a cellular network module and an RS485 communication module with an added filter circuit at the same time, enabling it to have multiple communication transmission methods and avoiding the influence between multiple communication transmission methods, thereby improving the data monitoring effect and expanding the applicable scenarios of the data monitoring device.

[0064] It should be noted that the term "including" and its variants used in the embodiments of the present utility model are open-ended, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "plural" mentioned in the embodiments of the present utility model are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly specified in the context, it should be understood as "one or more".

[0065] In the embodiments provided by the present utility model, the various steps recorded in the described embodiments can be executed in different orders and / or executed in parallel. In addition, the embodiments may include additional steps and / or omit the steps shown. The protection scope of the present utility model is not limited in this regard.

[0066] The term "embodiment" in this specification means that the specific features, structures or characteristics described in combination with the embodiments can be included in at least one embodiment of the present utility model. The phrase appears in various positions in the specification does not necessarily mean the same embodiment, nor does it mean being independent or alternative to other embodiments and mutually exclusive. The various embodiments in this specification are described in a related manner, and the same or similar parts between the embodiments are cross-referred to. In particular, for the embodiments of devices, equipment, and systems, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiments.

[0067] The above-described embodiments only represent several implementation manners of the present utility model, and the description is relatively specific and detailed, but it should not be construed as a limitation of the protection scope. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the appended claims.

Claims

1. An RS485 communication module, characterized in that: include: Controller side circuit, bus side circuit, isolation belt and filter circuit; wherein, The isolation zone is located between the controller side circuit and the bus side circuit, and is used to electrically isolate the controller side circuit from the bus side circuit; The controller side circuit includes a driver and a primary ground pin; wherein the driver is used to convert a digital signal into a differential signal, and the primary ground pin is used to realize grounding of the controller side circuit; The bus side circuit includes a receiver and a secondary side ground pin; wherein the receiver is used to receive a differential signal and convert the differential signal into a digital signal, and the secondary side ground pin is used to realize the grounding of the bus side circuit; One end of the filter circuit is connected to the primary ground pin, and the other end is connected to the secondary ground pin, and the filter circuit is located within the electrical isolation range corresponding to the isolation zone.

2. The communication module according to claim 1, characterized in that: The signal frequency filtered out by the filtering circuit is 420 MHz.

3. The communication module according to claim 1, characterized in that: The filtering circuit includes at least one first capacitor, and the first capacitor is located within the electrical isolation range corresponding to the isolation zone; wherein, when there are multiple first capacitors, the multiple first capacitors are connected in parallel.

4. The communication module according to claim 1, characterized in that: The filter circuit includes a first resistor and a second capacitor connected in series.

5. The communication module according to claim 1, characterized in that: The controller side circuit also includes a control pin and a power connection pin, one end of the control pin is connected to the external controller via the drive control circuit, and the other end is connected to the driver, and the power connection pin is connected to the primary external power supply; wherein, The drive control circuit includes two signal lines, at least one second resistor and at least one third capacitor; wherein, one end of the signal line is connected to the control pin, and the other end is connected to the controller, the second resistor is connected in parallel between the signal line and the power bus connecting the primary external power supply and the power connection pin, one end of the third capacitor is connected to the power bus, and the other end is connected to the primary ground pin.

6. The communication module according to claim 5, characterized in that: The bus side circuit also includes a secondary side power connection pin and a differential signal pin, one end of the differential signal pin is connected to the RS485 bus, and the other end is connected to the receiver, and the secondary side power connection pin is used to connect to a secondary side external power supply.

7. A data monitoring device, characterized in that: It comprises a cellular network module and an RS485 communication module as described in any one of claims 1 to 6; wherein, The data monitoring device is connected to a data acquisition device based on the communication interface of the RS485 communication module, and is used to receive the collected data sent by the data acquisition device; The data monitoring device is connected to the terminal device via the cellular network module, and is used to send the collected data to the terminal device.

8. The device according to claim 7, characterized in that There are multiple RS485 communication modules, and the multiple RS485 communication modules are connected to the data acquisition device and the energy storage machine respectively.

9. The device according to claim 8, characterized in that The data monitoring device further comprises a WiFi module and / or an Ethernet module, and the data monitoring device is connected to the terminal device via the WiFi module and / or the Ethernet module.

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