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Isolated RS485 RS232 Expansion HAT for Raspberry Pi 4B/3B+/3B/2B, SPI Control, Onboard Protection Circuits - Walmart.com
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Amazon.com: RS485 CAN HAT for Raspberry Pi 4B/3B+/3B/2B/B+/A+/Zero/Zero W/WH,Allow Long-Distance Communication via RS485/CAN Function Onboard CAN Controller MCP2515 via SPI Interface Transceiver SN65HVD230 : Electronics
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