In this document, it is described an interface to conect a Roomba vacuum with a PC and a circuit added to it in order to supply power from Roomba to a Kinet camera.
Step 1: Schematic and Description
PDF FT232RL: http://pdf1.alldatasheet.es/datasheet-pdf/view/144591/FTDI/FT232RL.html
Step 2: Part List
Step 3: PCB Designe
Step 4: Components Placement
Step 5: USb Connections
Step 6: Roomba Connections
The RX wire of the DIN connector must be soldered to the TX pin of the PCB and the TX DIN connector with the RX PCB pin. (see schematic).This is obvious, but i thing that is a normal mistake, because when i soldered it, i changed the wires by mistake.