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Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards CAN function, onboard CAN controller MCP2515 via SPI interface, with transceiver SN65HVD230;Reserved control pins, allows to work with other control boards RS485 function, controlled via UART, half-duplex communication, supports automatic TX/RX control without programming, onboard transceiver SP3485 Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit for RS485 transceiving, lightning-proof & anti-electrostatic Comes with development resources and manual (examples in wiringPi/python),download: www.waveshare.com/wiki/RS485_CAN_HAT