Product Description RS485 RS232 HAT is an isolated RS485 and RS232 expansion board specially designed by Waveshare for Raspberry Pi. It adopts SC16IS752+SP3485, SP3232 scheme, built-in power isolation, ADI magnetic coupling isolation and TVS and other protection circuits. Specifications UART expansion chip: SC16IS752. Communication Interface: SPI. RS485 transceiver: SP3485. RS232 transceiver: SP3232. data rate: Up to 921600bps. Operating Voltage: 5V. Mounting hole size:3.0mm. Dimensions : 65mm x 56.5mm. Package Content RS485 RS232 HAT x1 2X20PIN header x1 Standoffs pack (2pcs) x1