You either need a computer with a serial port or a usb to serial converter or a pcmcia card. Some have had success with IOGear and some with Keyspan. Scroll down in this forum there is a post about this as well as other places in this forum. My opinion is evident in this post:
First of all i don't agree 100% with this. My
experience is that the IOGear GUC232A is more
reliable and that's based on 6 installers plus
a few reps during training. If you spend some
time searching on this board you will also find
some people who bought the keyspan with poor results,
while some have had success. I'm sure alot has
to do with user error in the setup but that's
a variable i can't predict.
But why don't you just do it right and get a serial
pcmcia card for your laptop if you have the slot
available. Here is the Quatech one I have from
Sewell direct...works like a champ and then if
you want to get into programming for systems like
amx or crestron you are good to go as you will
probably find that the usb adaptor will not work
for them.
[Link: sewelldirect.com]