This is a breakout board for the SP3485 RS-485 transceiver IC, which will convert a UART serial stream to RS-485. The SP3485 is a half-duplex transceiver, so it can only communicate one way at a time, but it can reach transmission speeds of up to 10Mbps. This board requires a very low amount of power and can operate from a single +3.3VDC supply. This breakout board includes the SP3485 RS-485 transceiver, filter capacitor, and other components shown on the schematic. We've broken out the RS-485 output to three different connections: (1) an , (2) a , and (3) a 3-pin 0.1" pitch header; none of these output connectors come populated. Project description, more information and ordering can be found at https://www.sparkfun.com/products/9823 SP3485 Datasheet: http://www.sparkfun.com/datasheets/Components/General/sp3485CN-LTR.pdf