I2C-LVL01 Documentation Performs bi-directional I2C level conversion between any two levels: 1.65v to 5.5v
USB-RS485 Documentation The USB-RS485 is a complete, self powered, USB to RS485 interface working at any baud rate up to 250k baud. It features automatic bus turn-around - any time your not transmitting the module is listening.Uses the MAX487 quarter power tranceiver, so you can have up to 128 devices on the bus.USB interface uses the FTDI chip which has drivers available for Windows XP64, XP, 2000, ME, 98, CE.NET V4.2, Linux, Mac OS8, OS9, OSX.
Power Requirement - Powered from USB port Requires USB drivers for the FT232R, available from the FTDI website for MacOS, Linux and Windows. Direct Connection - to BrainStem and CMUcam2+ 4 pin connector - GND, Logic out (STX), +5v, Logic In (SRX) Note - This module does not supply 5v out.