Hello, i have a similar. If well the same, I think: white=Tx green=Rx yellow= ground data, cable shield. and RED=+5V, pay attention, no connect to DD/TTL. black=ground power im even more confused now. i thought; white - tx yellow - rx black - ground. but when i connect white + green it shows some random stuff also - so is green ground too? AND when i do yellow + green I can type meaning green may be rx/tx?? can I do any damage by using wrong cable? Disconnect from DD, connect white and green and type caracters with hyperterminal, if the caracters typed will appear on screen, that means RX and TX are well white and green. If else, connect both yellow and green, and see.