Features: 1Standard for Raspberry Pi 40PIN GPIO extension, support for Raspberry Pi series board. 2Adopts SC16IS752andSP3485 dual chip combination, converts for SPI to RS485, data rate up to 921600bps 3Allows transceiving data manually or automatically, configured by DIP switch. 4Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, anti?electrostatic. 5Onboard auto?recovery fuse and protection diodes, ensures the current/voltage stable outputs, provides over?current/over?voltage proof, improves shock resistance 6Onboard LEDs for indicating the power and transceiver status. 7Break through for SPI control pins, for connecting with host control boards.Condition: Item Type: RS485 Expansion BoardMaterial: PCB Applicable: for Raspberry Pi 3B 4BFeatures: 2?Channel IsolatedSize: As Pictures ShowPakcage Included:1 x RS485 Expansion Board1 x Pinandnbsp1 x Bag of Accessoryandnbsp Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.