feature: 1. Based on the design of for 40PIN GPIO interface, for raspberry pie series motherboard. 2. With one CAN, the scheme of using controller MCP2515 with CAN transceiver can realize SPI to CAN. 3. It has two RS485 channels, and adopts the SC16IS752 and SP3485 dual chip combination scheme to realize SPI to RS485 4. Onboard power conversion circuit, supporting power supply of 8~28V wide voltage, can simultaneously supply power for raspberry pie On board integrated power isolation can provide stable isolation voltage without additional power supply at the isolation end On board integrated digital isolation, signal isolation, high reliability, strong anti-interference and low power consumption On board (transient voltage suppressor) can effectively suppress surge voltage and transient voltage in the circuit, and prevent- and static electricity Board mounted self recovery fuse and protective diode can stable output of current and voltage, prevent over-voltage and over-voltage, and improve impact resistance The on-board 120 terminal resistor can be enabled through jumper cap setting Two wiring modes, board mounted terminal and row pin, are more convenient for wiring Lead out SPI control interface to facilitate access to other controllers for control Specifications: Expansion interface: 2-way RS485+1-way 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 S485 communication rate: 300~921600bps Power supply mode: external power supply terminal or for raspberry pie External power supply range: DC 8-28V Working voltage: 3.3V color: blue Material: PCB+Metal Product size: 65 x 56.5mm Package Contents: 1 x RS485 CAN expansion board 1 x 20PIN arrange seat 1 x Screw package Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.