Spider Extender module SerialPort

Hi Guys
Ive finally got round to moving my RFID reader project from my Panda II to my Spider.
This is probably really dumb but how the heck to you setup an extender to be a serial port? How do you assing the pins to use for input and output etc? :-[

Edit. Ok got it working. Wasnt connected to pin 5 properly Doh!!

I would lie…

I would tell the designer that I am using the USBSerial module.

haha good point. didnt think of that…