2-Channel Isolated RS485 Expansion HAT for Raspberry Pi

Description This is a 2-channel isolated RS485 expansion HAT designed for Raspberry Pi, adopts the SC16IS752+SP3485 solution, with embedded protection circuits such as power supply isolation, ADI magnetical isolation, and TVS diode, etc. It is easy to control the 2-channel RS485 for auto transceiving via the SPI interface. Due to its fast communication, stability, reliability, and safety, it is an ideal choice for fields like industrial automation. Features Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards Adopts SC16IS752+SP3485 dual-chip combination, converts SPI to RS485, data rate up to 921600bps Allows transceiving data manually or automatically, configured by DIP switch Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightning-proof & anti-electrostatic Onboard auto-recovery fuse and protection diodes, ensures the current/voltage stable outputs, provides over-current/over-voltage proof, improves shock resistance Onboard LEDs for indicating the power and transceiver status Breakout SPI control pins, for connecting with host control boards like Arduino Comes with development resources and manual (examples in C and Python) Specification UART expansion chip: SC16IS752 RS485 transceiver: SP3485 Communication interface: SPI Data rate: 300 ~ 921600 bps Operating voltage: 3.3V / 5V Dimensions: 65mm × 56.5mm Mounting hole size: 3.0mm What's on Board 1.SC16IS752 UART expansion chip2.ADUM1412 digital isolator3.PC817 optocoupler4.SP3485 RS485 transceiver5.B0505LS power supply isolation module6.RT9193-33 power chip7.SMAJ12CA transient suppress diode array8.Auto-recovery fuse9.Status indicator PWR: power indicatorRXD/TXD: UART transceiving indicator 10.Raspberry Pi GPIO connector: for connecting Raspberry Pi11.RS485 terminal12.MCU control header: for connecting host control boards like Arduino13.120Ω terminal resistor switch14.Interrupt pin switch15.Operating mode selection Half-auto: A=0, B=1Full-auto: A=1, B=0 Example Pinouts PINRASPBERRY PI (BCM)DESCRIPTION VCC 5V 3.3V/5V power supply GND GND Ground SCK P21 (SPI1 SCLK) SPI clock input MOSI P20 (SPI1 MOSI) SPI data input MISO P19 (SPI1 MISO) SPI data output CS P18 (SPI1 CS) SPI chip select IRQ P24 Interrupt output EN1 P27 Channel 1 TX/RX enable: high for TX, low for RX EN2 P22 Channel 2 TX/RX enable: high for TX, low for RX Dimension Part List 2-CH RS485 HAT x1 2x20PIN female pinheader x1 RPi screws pack (2pcs) x1