Connect Colorduino with uartsbee

Hello all,

I'm trying to connect my colorduino v1.3 with a uartsbee v4.0 but I can't manage to get to right wiring.

On the Colorduino side I have the following outputs :

DTR
GND
TXD
RXD
VDD
GND
SCL
SDA

and on the uartsbee, the following inputs :
GND
CTS
VCC
TX
RX
DTR

I've connected GND to GND, DTR to DTR, TXD to TX, RXD to RX
I guess VCC goes on VDD (but not sure) and I don't where to connect CTS (and what it is).

Help would great.

Thanks for reading !

Finally got a response from Itead engineer, if it's ever helping for someone :

"First of all, your connection isn't quite right, you should connect them like this: TX->RXD; RX->TXD.

And you need to choose the "arduino duemilanove w/atmega328" as your board type."

And it's working now !