I started out using a converter from SparkFun, but then found a
cheap way of making my own which works very well. All that
is required is two 2n7000 mosfets, two 2.2k (or 10k) resistors.

I picked up the mosfets for around 7 cents each from mouser.com.

All that is required is the Tx/Rx/Gnd lines and the RTS pin on the
DB9 connector is used with one of the resistors as a pullup.

Here 'tis..  http://www.botkin.org/dale/rs232_interface.htm

Enjoy!
--Pat

On 9/28/07, kris duff <t_dufff@yahoo.ca > wrote:
Hi,

I'm pretty sure that you only need the TX and RX lines
to complete your communications.



--- Alexi Girgis <alegir@wpi.edu> wrote:

> Hello,
>
> I am trying to get a console connection to a
> gpsstix. I have a 3/5V TTL to
> RS232 converter with the pins connected as follows:
>
> Computer                 Converter (RS232)
>  Converter
> (TTL)            gpsstix FFUART
>
>     Rx ------------------------------ Rx
>                   Rx
> -------------------------------- Tx
>     Tx ------------------------------ Tx
>                    Tx
> --------------------------------- Rx
>     GND -------------------------- GND
>               GND
> ----------------------------- GND
>                                         Vcc
>                     Vcc
> ------------------------------- Vcc
>
> Do I need to connect the CTS, RTS, DTR, DSR, CD on
> the computer to anything?
>
>
> These are not available on the gpsstix because they
> are used for the USB
> client.
>
> Should they be configured for loopback handshaking?
>
> Thanks
>
> Alexi
> >
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