It has an rs232 connection instead of TTL. I believe it had a 9 pin connector but I'll have to check it. (It's been in the car for a while...and I can't remember) I did buy the development kit which came with soldered connector pins and a ribbon to rs232 cable among other things. Without the development kit the connector pins have to be soldered to the display. (Not a big deal for most on this board )