Close-range passive data communication method and system of equipment, storage medium and equipment

Abstract

The invention discloses a short-distance passive data communication method and system of equipment, a storage medium and the equipment, and the method comprises the steps: setting a short-distance passive communication device for target equipment, and enabling the short-distance passive communication device to comprise a memory and a short-distance passive communication module; according to the working data of the target equipment, monitoring whether the target equipment meets a preset close-range storage condition or not; when it is monitored that the preset short-distance storage condition is met, data storage is carried out on the memory according to the working data; and when the short-distance passive communication module is scanned by a corresponding reader-writer, the short-distance passive communication module obtains energy from a radio frequency field emitted by the reader-writer, and transmits the data stored in the memory to the reader-writer by using the obtained energy. The short-distance passive communication module can obtain energy from the radio frequency field of the reader-writer, so that an external power supply is not needed, and real passive communication is realized.

Description

Technical Field

[0001] This application relates to the technical field of data transmission, and particularly to a method, system, storage medium, and device for short-range passive data communication of a device. Background Art

[0002] With the rapid development of renewable energy, energy devices such as photovoltaic inverters and photovoltaic energy storage hybrid inverters play an increasingly important role in the power system. The efficient operation and reliable monitoring of these devices are crucial for ensuring the stability and security of energy supply. To achieve this goal, the application of data communication and interaction technologies in these energy devices has become particularly important.

[0003] Currently, certain progress has been made in data communication and interaction methods for energy devices such as photovoltaic inverters and photovoltaic energy storage hybrid inverters. These methods mainly include using independent data communication and interaction devices (such as data sticks, communication boxes, etc.), device-built-in data interaction chips, and using display screens or indicator lights, etc. These technologies have met the basic data communication and interaction needs of energy devices to a certain extent.

[0004] However, the existing technical solutions still have some obvious defects. First of all, most of these methods rely on power supply, so they cannot be used when the device is powered off, which limits their application in emergency situations. Secondly, the communication and interaction process often takes a long time, which is a significant challenge for application scenarios that require real-time monitoring and control. In addition, many methods also require users to use specific APPs or websites to access data, which not only increases the operation complexity of users, but also limits the flexibility and convenience of data access. Finally, the amount of information that can be provided by using display screens or indicator lights to display data is limited, and it cannot meet the needs of intuitively displaying and analyzing a large amount of data. Summary of the Invention

[0005] In view of this, the embodiments of this application provide a method, system, storage medium, and device for short-range passive data communication of a device. The short-range passive communication module can obtain energy from the radio frequency field of the reader-writer, so no external power supply is required, realizing true passive communication. And since the data is directly read from the memory and transmitted to the reader-writer, the communication speed is relatively fast. In addition, users only need to use a standard reader-writer to read data, without having to install a specific APP or access a specific website.

[0006] According to one aspect of this application, a method for short-range passive data communication of a device is provided, and the method includes:

[0007] A short-range passive communication device is set for a target device, where the short-range passive communication device includes a memory and a short-range passive communication module;

[0008] According to the working data of the target device, monitor whether the target device meets a preset short-range storage condition;

[0009] When it is monitored that the preset short-range storage condition is met, store data in the memory according to the working data;

[0010] When the short-range passive communication module is scanned by a corresponding reader / writer, the short-range passive communication module obtains energy from the radio frequency field emitted by the reader / writer, and uses the obtained energy to transmit the data stored in the memory to the reader / writer.

[0011] According to another aspect of the present application, a short-range passive data communication system is provided, and the system includes:

[0012] A target device provided with a short-range passive communication device, a reader / writer, where the short-range passive communication device includes a memory and a short-range passive communication module;

[0013] The target device is used to monitor whether the target device meets a preset short-range storage condition according to the working data of the target device, and when it is monitored that the preset short-range storage condition is met, store data in the memory according to the working data;

[0014] The reader / writer is used to scan the short-range passive communication module;

[0015] The short-range passive communication module is used to obtain energy from the radio frequency field emitted by the reader / writer when the short-range passive communication module is scanned by a corresponding reader / writer, and use the obtained energy to transmit the data stored in the memory to the reader / writer.

[0016] According to yet another aspect of the present application, a storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the short-range passive data communication method of the above device is implemented.

[0017] According to still another aspect of the present application, a device is provided, which is provided with a short-range passive communication device, the short-range passive communication device includes a memory and a short-range passive communication module, and the device is used to implement the short-range passive data communication method of the above device.

[0018] With the above technical solution, a method, a system, a storage medium, and a device for short-range passive data communication of a device provided by an embodiment of the present application set a short-range passive communication device for a target device, so that when a preset short-range storage condition is met, the working data of the target device is stored in the memory of the short-range passive communication device. Thus, when the short-range passive communication module in the short-range passive communication device is scanned by a reader, energy is obtained from the radio frequency field emitted by the reader, and the data stored in the memory is transmitted to the reader by using the obtained energy. The short-range passive communication module of the present application can obtain energy from the radio frequency field of the reader, so no external power supply is required, realizing true passive communication. Moreover, since the data is directly read from the memory and transmitted to the reader, the communication speed is relatively fast. In addition, users only need to use a standard reader to read the data, without installing a specific APP or accessing a specific website.

[0019] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments and descriptions thereof of the present application are used to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0021] Figure 1 A flowchart showing a method for short-range passive data communication of a device provided by an embodiment of the present application is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0023] In this embodiment, a method for short-range passive data communication of a device is provided. As Figure 1 shown, the method includes:

[0024] Step 101: Set a short-range passive communication device for the target device, where the short-range passive communication device includes a memory and a short-range passive communication module.

[0025] Step 102: Monitor whether the target device meets a preset short-range storage condition according to the working data of the target device.

[0026] Step 103: When it is detected that the preset short - distance storage condition is met, store data in the memory according to the working data.

[0027] Step 104: When the short - distance passive communication module is scanned by the corresponding reader - writer, the short - distance passive communication module obtains energy from the radio - frequency field emitted by the reader - writer, and uses the obtained energy to transmit the data stored in the memory to the reader - writer.

[0028] In the embodiment of the present application, aiming at the defects existing in data communication and interaction of existing energy devices such as photovoltaic inverters and photovoltaic energy storage hybrid inverters, a short - distance passive data communication method for devices is proposed. This method aims to provide a new data communication solution that requires no power supply, has a fast communication speed, does not require the support of a specific APP or website, and can transmit more data content. First, a short - distance passive communication device is set for the device that needs to perform passive communication. It includes two main parts: Memory: used to store the working data of the target device, and this memory has sufficient capacity to store important data that the device needs to record under specific conditions. Short - distance passive communication module: This module is responsible for communicating with the reader - writer without an external power supply. It can obtain energy from the radio - frequency field emitted by the reader - writer and use this energy to transmit data from the memory to the reader - writer.

[0029] Specifically, first, install a short - distance passive communication device on the target device to ensure its connection with the working data of the target device so as to obtain and store data in real - time. Then, according to the working characteristics and requirements of the target device, a series of preset short - distance storage conditions are set. These conditions may include the operating state of the device, environmental parameters, fault alarms, etc. Through the built - in program of the target device, it is monitored in real - time whether these preset conditions are met. When it is detected that the preset short - distance storage condition is met, the short - distance passive communication device will automatically obtain the working data from the target device and store it in the memory, ensuring that data recording is only performed when needed, thus saving storage space and resources. Finally, when the short - distance passive communication module is scanned by the corresponding reader - writer, it obtains energy from the radio - frequency field emitted by the reader - writer. Using this energy, the short - distance passive communication module is activated and transmits the data stored in the memory to the reader - writer. The reader - writer can then upload this data to a computer or a cloud server for further analysis and processing.

[0030] By applying the technical solution of this embodiment, a short-range passive communication device is set for the target device, so that when the preset short-range storage condition is met, the working data of the target device is stored in the memory of the short-range passive communication device, and when the short-range passive communication module in the short-range passive communication device is scanned by a reader-writer, energy is obtained from the radio frequency field emitted by the reader-writer, and the data stored in the memory is transmitted to the reader-writer by using the obtained energy. The short-range passive communication module of this application can obtain energy from the radio frequency field of the reader-writer, so no external power supply is required, realizing true passive communication. And since the data is directly read from the memory and transmitted to the reader-writer, the communication speed is relatively fast. In addition, users only need to use a standard reader-writer to read the data, without installing a specific APP or accessing a specific website.

[0031] In the embodiment of this application, optionally, the short-range passive communication module includes an NFC module.

[0032] In this embodiment, the short-range passive communication module can specifically be an NFC (Near Field Communication) module. The NFC module is a passive communication technology that can obtain energy from the radio frequency field emitted by the reader-writer, so no additional power supply is required. This feature makes the NFC module have significant advantages in energy-constrained environments, such as devices like photovoltaic inverters and photovoltaic energy storage hybrid inverters. The communication distance of the NFC module is usually within a few centimeters, and this short-distance communication feature ensures the security and privacy of data exchange. It is more suitable for occasions where data needs to be protected from being stolen or interfered with at a long distance. The NFC technology has extremely high security, which benefits from its short-distance communication feature and built-in encryption mechanism. This enables the NFC module to provide effective security protection when transmitting sensitive data, such as device status and fault information. And the NFC module is small in size and easy to integrate into various devices. For energy devices such as photovoltaic inverters and photovoltaic energy storage hybrid inverters, the integration of the NFC module will not have a significant impact on their overall structure and performance. When the target device meets the preset short-range storage condition, the NFC module will store the working data in the memory. Subsequently, when the reader-writer approaches and scans the NFC module, the NFC module will obtain energy from the radio frequency field emitted by the reader-writer and transmit the data in the memory to the reader-writer.

[0033] In the embodiment of this application, optionally, the target device is an inverter; the short-range passive communication device is integrated in the inverter.

[0034] In this embodiment, the target device may specifically be an inverter, and the short-range passive communication device is integrated in the inverter. The inverter is a key device in the photovoltaic power generation system and the energy storage system, responsible for converting direct current into alternating current for use in homes, enterprises, or the power grid. Therefore, the operating status and data of the inverter are crucial for the overall performance and efficiency of the system. During operation, the inverter generates a large amount of operating data, including input voltage, output voltage, current, power factor, fault information, etc., which helps in system monitoring, fault troubleshooting, and optimized operation. The inverter usually has a compact structure and limited space. Integrating the short-range passive communication device in the inverter can make full use of its internal space, avoiding the inconvenience and additional costs brought by external additional devices. Moreover, integrating the short-range passive communication device in the inverter can ensure the real-time collection and storage of operating data. When data needs to be read, simply use a standard NFC reader to approach the inverter, without the need for additional data synchronization or transmission steps. Of course, the short-range passive communication module can also be set independently of the inverter, which is not limited here.

[0035] In an embodiment of the present application, optionally, the short-range passive communication device is encapsulated in the interaction device of the inverter.

[0036] In this embodiment, the inverter interaction device generally refers to the components on the inverter used for data exchange and information display with users or external systems. These devices may include display screens, indicator lights, buttons, interfaces, etc., for displaying the operating status, parameter settings, fault alarms, etc. of the inverter, and allowing users or external systems to control and configure the inverter. Encapsulating the short-range passive communication device in the inverter interaction device can further improve the integration of the inverter. Doing so not only reduces the number of external additional devices, but also makes the overall inverter more compact, beautiful, and reduces the complexity of installation and maintenance. Moreover, the short-range passive communication device encapsulated in the interaction device can more conveniently exchange data with external systems. For example, when technicians use an NFC reader to approach the inverter interaction device, they can immediately read the operating data and fault information of the inverter without opening the inverter casing or connecting additional data lines. For users, encapsulating the short-range passive communication device in the interaction device can provide a more intuitive and convenient data access method. Users only need to gently touch the inverter interaction device with a smartphone or other device with NFC function to obtain the required data and information, without complex operations or additional tools. Additionally, the short-range passive communication device encapsulated in the inverter interaction device can be better protected and isolated, thus reducing the risk of being affected by external interference or damage. At the same time, the NFC technology itself has extremely high security and reliability, capable of ensuring the integrity and confidentiality of data.

[0037] In an embodiment of the present application, optionally, the preset close-range storage conditions include at least one of the target device being initially powered on, a change in the set amount of the target device, a fault of the target device, an alarm of the target device, a change in the status of the optional device of the target device, and an abnormality of the optional device of the target device. Among them, the optional devices of the target device include a smart meter and a battery. When it is monitored that the preset close-range storage conditions are met, data storage to the memory according to the working data includes at least one of the following: when it is monitored that the target device is initially powered on, storing the device serial number of the target device and the default set amount of the target device into the memory; when it is monitored that there is a change in the set amount of the target device, updating the original set amount of the target device in the memory based on the changed set amount; when it is monitored that the target device has a fault or an alarm, storing the fault information or alarm information of the target device into the memory; when it is monitored that there is a change in the status of the optional device of the target device, updating the original status information of the optional device of the target device in the memory based on the changed status information of the optional device; when it is monitored that there is an abnormality in the optional device of the target device, storing the abnormality information of the optional device of the target device into the memory.

[0038] In this embodiment, the preset close-range storage conditions include at least one of the following situations: the target device is initially powered on, the set value changes, a fault occurs, an alarm is triggered, the status of an option device changes, and the option device is abnormal. When the target device (such as an inverter) is powered on for the first time, its device serial number and default set values are stored in the memory, which helps to quickly identify the device identity and initial configuration during subsequent maintenance or fault troubleshooting. When the set values of the target device (such as parameters like voltage, current, power, etc.) change, the original set values in the memory are updated based on the changed set values to ensure that the memory always stores the latest device configuration information. When a fault or alarm occurs in the target device, the fault information or alarm information is stored in the memory. This helps technicians quickly locate the cause of the problem and take corresponding repair measures. The status change of an option device (such as a smart meter, battery) is crucial for the overall performance and stability of the target device. Therefore, when it is detected that the status of the option device changes, the original status information of the option device in the memory is updated based on the changed status information of the option device. When an option device is abnormal, the abnormal information is stored in the memory. This helps to timely detect and handle potential problems of the option device and prevent it from affecting the normal operation of the target device. When it is monitored that the above preset close-range storage conditions are met, data is stored in the memory according to the working data. This includes, but is not limited to: storing the device serial number and default set values when the target device is initially powered on; updating the set values in the memory when the set values change; storing the fault information or alarm information when a fault or alarm occurs; updating the status information in the memory when the status of the option device changes; storing the abnormal information when the option device is abnormal. It should be noted that the memory can be a non-volatile memory to ensure that data is not lost in the event of a power outage. In actual implementation, the preset close-range storage conditions can be extended or adjusted according to specific requirements to meet the needs of different application scenarios.

[0039] In an embodiment of the present application, optionally, when it is monitored that the preset close-range storage conditions are met, storing data in the memory according to the working data includes: when it is monitored that the preset close-range storage conditions are met, according to the data type of the working data, storing the working data of different data types in the logical blocks corresponding to the data types in the memory; and transmitting the data stored in the memory to the reader using the obtained energy includes: receiving the target physical address transmitted by the reader, and transmitting the data stored in the logical block corresponding to the target physical address to the reader using the obtained energy.

[0040] In this embodiment, when it is detected that the preset near - distance storage condition is met, according to the data type of the working data, it is stored in the corresponding logical block in the memory. This way of classified storage helps to improve the organization and manageability of data storage, and also facilitates subsequent data reading and parsing. Specifically, different types of working data (such as device serial numbers, set values, fault information, alarm information, option device status information, etc.) are allocated to different logical blocks for storage. These logical blocks are arranged and organized in the memory according to certain rules to enable quick location and access to the required data. In terms of data transmission, when the reader approaches and attempts to read data, it first transmits a target physical address to the memory. Then, the memory uses the energy obtained from the reader (such as the radio - frequency field energy in NFC technology) to transmit the data stored in the logical block corresponding to the target physical address to the reader. This data - transmission method has the following advantages: By directly accessing the logical block corresponding to the target physical address, the system can quickly find and transmit the required data, reducing unnecessary data transmission and waiting time. Since the data transmission is based on the physical address, the system can flexibly select which data to read without transmitting all the data in the memory each time.

[0041] In an embodiment of the present application, optionally, the physical address is the physical address of the logical block corresponding to the target data type selected in the data - type selection interface of the electronic device where the reader is located, and the data - type selection interface is displayed when the near - distance passive communication function is started in the electronic device.

[0042] In this embodiment, when the electronic device where the reader is located (such as a smart phone, a tablet computer, etc.) starts the near - distance passive communication function (such as NFC), a data - type selection interface will be displayed. This interface allows users to select the target data type they want to read or write from multiple available data types. Each selected target data type corresponds to a logical block in the memory, and each logical block has a unique physical address. In the data - type selection interface, when the user selects a target data type, the system determines the physical address of the corresponding logical block according to this selection. Once the physical address is determined, the reader can communicate with the memory using the near - distance passive communication technology (such as NFC). The reader sends a request containing the target physical address to the memory, and then the memory transmits the data in the corresponding logical block to the reader according to this request. Through the data - type selection interface, users can intuitively select the data type they want to read or write, improving the user - friendliness of the system. The system can flexibly select the data type to be read or written according to the user's needs without transmitting all the data in the memory each time.

[0043] Further, asFigure 1 For the specific implementation of the method, an embodiment of the present application provides a short-range passive data communication system for a device. The system includes:

[0044] A target device and a reader / writer provided with a short-range passive communication device, where the short-range passive communication device includes a memory and a short-range passive communication module;

[0045] The target device is configured to monitor whether the target device meets a preset short-range storage condition according to the working data of the target device. When it is monitored that the preset short-range storage condition is met, data is stored in the memory according to the working data;

[0046] The reader / writer is configured to scan the short-range passive communication module;

[0047] When the short-range passive communication module is scanned by a corresponding reader / writer, the short-range passive communication module obtains energy from the radio frequency field emitted by the reader / writer, and uses the obtained energy to transmit the data stored in the memory to the reader / writer.

[0048] It should be noted that for other corresponding descriptions of each functional unit involved in the short-range passive data communication system for a device provided in the embodiment of the present application, reference can be made to Figure 1 The corresponding description in the method, which will not be elaborated here.

[0049] An embodiment of the present application further provides a device provided with a short-range passive communication device. The short-range passive communication device includes a memory and a short-range passive communication module, and the device is configured to implement the above-mentioned short-range passive data communication method for a device.

[0050] In one embodiment, a computer-readable storage medium is provided. The computer-readable storage medium may be non-volatile or volatile, and has a computer program stored thereon. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0051] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0052] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data that have been authorized by the user or fully authorized by all parties.

[0053] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memories. Non-volatile memories can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memories can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, etc., without limitation.

[0054] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0055] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for short-range passive data communication of a device, characterized in that, The method includes: Setting a short-range passive communication device for a target device, where the short-range passive communication device includes a memory and a short-range passive communication module; Monitoring whether the target device meets a preset short-range storage condition according to the working data of the target device; When it is monitored that the preset short-range storage condition is met, storing data in the memory according to the working data; When the short-range passive communication module is scanned by a corresponding reader / writer, the short-range passive communication module obtains energy from the radio frequency field emitted by the reader / writer, and uses the obtained energy to transmit the data stored in the memory to the reader / writer.

2. The method according to claim 1, wherein The short-range passive communication module includes an NFC module.

3. The method according to claim 1, wherein The target device is an inverter; the short-range passive communication device is integrated in the inverter.

4. The method according to claim 3, characterized in that The short-range passive communication device is encapsulated in an interactive device of the inverter.

5. The method according to any one of claims 1 to 3, characterized in that, The preset short-range storage condition includes at least one of the target device being initially powered on, a change in the setting amount of the target device, a failure of the target device, an alarm of the target device, a change in the status of an option device of the target device, and an abnormality of the option device of the target device, where the option devices of the target device include a smart meter and a battery; The storing data in the memory according to the working data when it is monitored that the preset short-range storage condition is met includes at least one of the following: When it is monitored that the target device is initially powered on, storing the device serial number of the target device and the default setting amount of the target device in the memory; When it is monitored that there is a change in the setting amount of the target device, updating the original setting amount of the target device in the memory based on the changed setting amount; When it is monitored that the target device fails or alarms, storing the failure information or alarm information of the target device in the memory; When it is monitored that there is a change in the status of an option device of the target device, updating the original status information of the option device of the target device in the memory based on the changed status information of the option device; When it is monitored that there is an abnormality in the option device of the target device, storing the abnormality information of the option device of the target device in the memory.

6. The method according to claim 5, wherein The storing data in the memory according to the working data when it is monitored that the preset short-range storage condition is met includes: When it is monitored that the preset short-range storage condition is met, storing working data of different data types in logical blocks corresponding to the data types in the memory according to the data type of the working data; The transmitting the data stored in the memory to the reader / writer using the obtained energy includes: Receiving the target physical address transmitted by the reader / writer, and transmitting the data stored in the logical block corresponding to the target physical address to the reader / writer using the obtained energy.

7. The method according to claim 6, wherein The physical address is the physical address of a logical block corresponding to a target data type selected in a data type selection interface of an electronic device where the reader is located, and the data type selection interface is displayed when the near-field passive communication function is started in the electronic device.

8. A short-range passive data communication system, characterized in that, The system includes: A target device provided with a near-field passive communication device and a reader, wherein the near-field passive communication device includes a memory and a near-field passive communication module; The target device is configured to monitor whether the target device meets a preset near-field storage condition according to the working data of the target device, and when it is monitored that the preset near-field storage condition is met, store data in the memory according to the working data; The reader is configured to scan the near-field passive communication module; The near-field passive communication module is configured to obtain energy from a radio frequency field emitted by the reader when being scanned by a corresponding reader, and use the obtained energy to transmit the data stored in the memory to the reader.

9. A storage medium having a computer program stored thereon, characterized in that, The computer program, when executed by a processor, implements the method according to any one of claims 1 to 7.

10. A device, characterized in that, A device is provided with a near-field passive communication device, the near-field passive communication device includes a memory and a near-field passive communication module, and the device is configured to implement the method according to any one of claims 1 to 7.

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