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● Update SmartDisplay device setting. After verifying the function through the simulator, if there are no problems, you can connect to the device and upload the project settings to the SmartDisplay device.

● Create Custom CAN project To create a Custom CAN project, input the project name, select the SmartDisplay device type, and under the protocol section, select Custom CAN ID (CANbus).

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SmartDisplay currently supports the CANbus hardware communication interface and uses the CANopen software communication protocol. CANopen is a widely used industrial standard communication protocol based on the CAN bus, and is used in various fields such as medical equipment, vehicles, railway applications, or building automation. However, when using the CANopen protocol, as it is a communication between nodes, the client needs to implement the protocol on its host side, which may be a burden for those who want to simply use the CANbus. Therefore, to simplify the client's usage, we have designed a new Custom CAN protocol, which does not require the client to implement the CANopen protocol. Instead, it only needs to set up the data through a custom DBC file, easily linking the CAN ID/data with the Widget on the display, thus realizing real-time interaction. This interaction method can help the client better understand and control the data in the system, and achieve high flexibility and convenient maintenance.

The DBC file is usually an ASCII plain text file that contains information about the physical signals transmitted on the CAN bus, including the CAN ID, name, scale ratio, and definition of the signal. The file is used to decode raw CAN data into meaningful values and map different CAN IDs to their corresponding signals. The DBC file provides the information needed to convert CAN message payloads into physical signal values.

The main function of the Custom CAN protocol is to connect the CAN ID/data with the widgets on the displayer through the use of a DBC (CAN Database) file. The DBC file is an important data that defines the relevant information, such as the CAN ID and message format decoding, in the system. By using a user defined DBC file, it becomes easier to associate different CAN ID/data with the widgets on the displayer, enabling real-time interaction. For example, graphics or text on the displayer can be controlled through the CAN ID/data, and buttons or sliders on the displayer can be used to control the CAN data. This interaction helps the customers to better understand and control the data in the system, resulting in a flexible and maintenance-friendly solution.

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● Add Gauge and Horizontal Slider widget in the main page Select the Gauge object and in the Gauge property page, set the Message to EEC1 and the Signal to EngSpeed in the CAN Signal field, indicating that this Gauge object is binding to EngSpeed. The display change of this Gauge object is from the EngSpeed value.

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The following will describe the command protocol used by Custom CAN. Through these commands, the Host device can easily control the SmartDisplay, including switching pages, adjusting the brightness, or making the buzzer emit sound.

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Canbus gaugedisplay

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The main function of the DBC file is to describe the rules for decoding CAN messages and signals. The following is a test data description excerpted from a DBC file

SmartDisplay GUI Builder provides you with an intuitive and user-friendly interface to easily create your own custom CAN projects. You just need to import your DBC file and map the signals/messages to the corresponding widgets and you will be able to display and interact with the widget on your SmartDisplay device. The operation is simple and flexible, satisfying your various needs and making your work more efficient. The following will introduce, step by step, how the SmartDisplay GUI Builder creates a Custom CAN project and sets the relationship between DBC and Widget.

Through this test window, you can simulate the host sending the corresponding CAN ID and CAN Data according to the DBC configuration. Pull down the EngSpeed slider to simulate the host sending the EngSpeed data, observe the change of the device gauge, and also see the change of the CAN ID and CAN Data from the Message Log on the right. You can also operate the device's Horizontal Slider to verify whether the data sent by the device meets the requirements.

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DBC Editor A DBC file is typically an ASCII text file that contains information about physical signals transmitted on a CAN bus. These files are difficult to read and edit due to their formatting, but there are many DBC editor software available to address this issue. One commonly used DBC editor is Vector CANdb++ developed by Vector Informatik GmbH. This software helps users create and edit custom DBC files with ease. It provides a user-friendly interface for adding messages, signals, defining message and signal attributes such as message ID, start bit, length, scale, offset, etc.

With the Custom CAN protocol, customers can freely and unrestrictedly define the setting of CAN ID and CAN Data through the standard DBC file. Then, with the SmartDisplay GUI Builder, they can bind the relationship between the Message/Signal and Widget. It's that simple, a custom CAN HMI is done. No complex CAN protocols (such as CANopen, J1939...) or settings are needed for seamless integration with the SmartDisplay Device. Are you impressed? Hurry up and download the SmartDisplay GUI Builder. Before purchasing the SmartDisplay, you can try out the simulator to confirm if it meets your needs!

When switching page, you need to first set the Device State to ConfigMode, and then send the page switching command. After the page switching command is completed, set the Device State to Display Mode again to complete the page switching command. The command sequence is as follows：

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If you have a CAN DBC file and this file includes the decoding rules set for this CAN Id (0x181), you can decode the following information from the information in the DBC file.

With the above explanation, with the DBC file setting, we can correctly decode the actual values represented by the CAN ID and CAN Data. The DBC file contains the message and signal layout, which can parse the data and convert the raw data into physical values, allowing the system to understand the real message transmitted through CAN.

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From the above decoding rule setting, the previously obtained Raw CAN Data can be decoded into the following information.

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● Verify the interaction between the Device CAN ID/CAN Data and the Widget. After uploading the project to the device side, you can verify the functionality of the SmartDisplay device. Connect to the device side using the GUI Builder, then click "Test Device" to test the interaction between the host and device side.

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After launching the simulator, you can drag the EngSpeed slider at the bottom to simulate the Host sending EngSpeed data. Observe the change in the Gauge on the simulator and also view the changes in CAN ID and CAN Data from the Message Log on the right. You can also operate the Horizontal Slider on the simulator to simulate the data sent by the Device.

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Select the Horizontal Slider object, and in the Horizontal Slider property page, in the CAN Signal field, set the Message to HorizontalSliderMessage and the Signal to HorizontalSliderSignal1, representing the relationship between this Horizontal Slider object and HorizontalSliderSignal1. The change in the display of this Gauge object is derived from the value of HorizontalSliderSignal1.