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 chip combination scheme to realize SPI to RS4854. Onboard conversion circuit, supporting supply of 8~28V wide voltage, can simultaneously supply for raspberry pieOn board integrated isolation can provide stable isolation voltage without additional supply at the isolation endOn board integrated digital isolation, signal isolation, high reliability, strong anti-interference and low consumptionOn board TVS (transient voltage suppressor) can effectively suppress surge voltage and transient voltage in the circuit, and prevent- and static electricityBoard mounted self recovery fuse and protective diode can stable output of current and voltage, prevent over-voltage and over-voltage, and improve impact resistanceThe on-board 120 terminal resistor can be enabled through jumper cap settingTwo wiring modes, board mounted terminal and row pin, are more convenient for wiringLead out SPI control interface to facilitate access to other controllers for controlSpecifications:Expansion interface: 2-way RS485+1-way CANCommunication interface: SPICAN controller: MCP2515CAN transceiver: SIT65HVD230DR or SN65HVD23DCAN communication rate: within 1MbpsSerial port expansion chip: SC16IS752RS485 transceiver: SP3485S485 communication rate: 300~921600bps supply mode: external supply terminal or for raspberry pieExternal supply range: DC 8-28VWorking voltage: 3.3Vcolor: blueMaterial: PCB+MetalProduct size: 65 x 56.5mmPackage Contents:1 x RS485 CAN expansion board1 x 20PIN arrange 1 x Screw packageOnly 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.