This is a 2-channel isolated RS232 expansion HAT designed for , adopts the SC16IS752+SP3232 solution, with embedded protection circuits such as power supply isolation, magnetical isolation, and diode, etc. It is easy to control the 2-channel RS232 via SPI interface. Due to its fast communication, stability, reliability, and safety, it is a perfect choice for fields like industrial automation. Standard 40PIN GPIO extension header, supports series boards. Adopts SC16IS752+SP3232 dual chip combination, converts SPI to RS232, data rate up to 921600bps Onboard (Transient Voltage Suppressor), effectively suppress surge voltage and transient voltage in the circuit, -proof & anti-electrostatic. Onboard for indicating the power and transceiver status Breakout SPI control pins, for connecting with host control boards like Comes. UART expansion chip: SC16IS752 RS232 transceiver: SP3232 Communication interface: SPI Data rate: 300 ~ 921600 Operating voltage: 3.3V / 5V Mounting hole size: 3.0mm color:Blue Material:PCB size:65mm x 56.5mm Package Contents: 1 x 2- RS232 HAT 1 x 2X20PIN female pin header 1 x Screws kit 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.