I have bought 2 cables, a CA-42 and a DKU-5.
Both arrived and have the PL-2303 chip and when stripped down, both look exactly like this board (and one has the exact same markings):http://kwartzlab.ca/blog/dw/2010-04-23/reverse-engineering-cheap-ardu
However, for some reason my RXD pin is Pin 4 instead of the 9 in the article which is strange!
Once i'd sorted that though, I can get 5v between GND (6) and VCC (2) and I can connect RXD (4) to TXD (12) and successfully echo characters across in Hyperterm and Realterm.
However, I want to also use DTR so Arduino will auto-reset on program but i'm having trouble finding the DTR pin. I have set DTR and RTS using the toggles in Realterm but going through all the pins with a multimeter between GND (6) and the other pins, none seems to give anything.
Any ideas how I can find DTR (and RTS) and why i'm not seeing it?
The other thing I dont quite understand is why on the above link he uses pin 10, which he had identified as RTS and uses it & calls it DTR in his final pin-out....any ideas why he did that?