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Amazon.com: RS485 CAN HAT for Raspberry Pi 4 3/2/1 Model B B+ A+, Onboard CAN Controller MCP2515 via SPI Interface, Transceiver SN65HVD230 and SP3485, Allow Long-Distance Communication via RS485/CAN Function : Electronics
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Link Arduino to Raspberry Pi with RS-485 and modbus registers - Networking, Protocols, and Devices - Arduino Forum
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Amazon.com: RS485 CAN HAT Stably Long-Distance Communication Functions UART Controlled SPI Interface for Raspberry Pi Zero W WH 2 3 4 Model B B+ @XYGStudy : Electronics
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