USB Serial Adaptor Plugs directly onto our Cluster HAT and MMC (SD) HAT to provide serial console access to the Raspberry Pi for quick access. Using jumper wires it can be used to access the serial on a Raspberry Pi and for Arduino programming (using RTS for reset). We use through hole connections on both micro USB and female 6 way 0.1" header for a more robust product over the surface mount alone. PinoutDescription RTS Request to send RX Receive (connect to remote TX) TX Transmit (connect to remote RX) 3V 3.3V supply (50mA max) CTS Clear to send GND Ground The following baud rates are supported Baud rateMiss rate (%) 2,400 0.16 4,800 0.16 9,600 0.04 19,200 0.04 38,400 0.16 57,600 0.16 115,200 0.16 230,400 0.16 460,800 0.79 1,700,000 0.84 2,300,000 0.62 3,400,000 0.84 This board can only be used with systems using 3.3 volts, connecting to those using higher/lower voltages may result in damage. To enable serial console on a default Raspbian (or Cluster HAT) installation add "enable_uart=1" to your config.txt in the boot partition. The IC is used in the adapter enumerates as a Communication Device Class (CDC) device which modern (Win10/Linux/Mac OS X) operating systems have built in drivers for.