Arduino crc16 modbus1/14/2024 ![]() ![]() The register address of controlled Relay, 0x0000 - 0x0008 Customers who have purchased the V1 version but need to use the V2 development agreement, can contact customer service to upgrade the firmware.Ġx00: the broadcast address 0x01-0xFF: device addresses There is no difference in hardware between V1 and V2. The V1 is not compatible with Modbus commands and now the V2 is fully compatible with the Modbus protocol. The serial port will output the commands sent.įrom September 2021, the V2 of the development protocol will be adopted. The relay module will turn on and then turn off in order to run normally. Use Arduino IDE to open the program, select the corresponding development board and then download the program. The Arduino demos are based on the NUO PLUS and RS485 CAN Shield modules. The serial port will output the command sent. Normal operation of the relay module will turn on and then turn off in turn. Note that before using the computer to ensure that the keil5 software has been installed, download the program to the development board can be downloaded. The STM32 demos are based on the NUCLEO-F103RB and the RS485 CAN Shield module.įind the STM32 program file directory and open the STM32 project. If you use other 485 devices, you need to make sure A-A and B-B. If you want to insert the RS485 CAN HAT into the Raspberry Pi, connect the A and B ports of the Modbus RTU Relay module and the RS485 CAN HAT module. If there is none, you can add it at the end of the file.įor Raspberry Pi 3B users, the serial port is for Bluetooth and needs to be removed. Open /boot/config.txt file, and find the following configure sentence to enable the serial ports. Select Interfacing Options -> Serial, disable shell visit, and open the serial port hardware Open the Raspberry Pi terminal and input the following commands to enter the configure interface: Note: RS485 can not be directly connected to the serial port of the Raspberry Pi, otherwise it may burn the device, you need to add 485 level conversion, the Raspberry Pi is recommended to use with the RS485 CAN HAT module, NUCLEO-F103RB, and Arduino is recommended to use with the RS485 CAN Shield module! ![]() Customers who have purchased V2 development protocol before can contact customer service to upgrade the firmware. There is no difference between the hardware of V1 and V2 versions. ![]() V2 version modifies the previous incompatible Modbus instruction and is fully compatible with Modbus protocol.
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