Features: Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards. 1 CAN, using the controller MCP2515, with CAN transceiver, can realize SPI to CAN. Equipped with two channels of RS485, using SC16IS752 and SP3485 dual-chip combination scheme, can realize SPI to RS485. On-board power conversion circuit, support 8~28V wide voltage power supply, can supply power to Raspberry Pi at the same time. On-board integrated power isolation, which can provide stable isolation voltage, and no additional power supply is required at the isolation end. On-board integrated digital isolation for signal isolation, high reliability, strong anti-interference, and low power consumption. On-board TVS (transient voltage suppression tube), which can effectively suppress surge voltage and transient peak voltage in the circuit, lightning protection and anti-static. On-board resettable fuses and protection diodes ensure stable output of current and voltage, prevent overcurrent and overvoltage, and improve shock resistance. On-board 120 termination resistor, enabled by jumper cap settings. There are two wiring methods of on-board terminals and pin headers, making wiring more convenient. Lead out SPI control interface for easy access to other controllers for control. Specifications: Expansion interface: 2 RS485 + 1 CAN Communication interface: SPI CAN Controller: MCP2515 CAN transceiver: SIT65HVD230DR or SN65HVD23D CAN communication rate: within 1Mbps Serial port expansion chip: SC16IS752 RS485 Transceiver: SP3485 RS485 communication rate: 300~921600 bps Power supply mode: external power supply terminal or Raspberry Pi External power supply range: DC 8~28V Working voltage: 3.3V Product Size: 65 56.5mm Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 x RS485 CAN Expansion Board