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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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RS485 CAN HAT for Raspberry Pi Zero W WH/4B/3B+/3B/2B/B+/A+, Onboard CAN Controller MCP2515 via SPI Interface, Transceiver SN65HVD230 and SP3485, Allow Stable Long-Distance Communication : Amazon.co.uk: Computers & Accessories
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2-Channel Isolated RS485 Expansion HAT for Raspberry Pi, SC16IS752+SP3485 Solution, with Multi Onboard Protection Circuits
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