Casio A22T, how to link it to a PC?

A client got from us a Casio A22T, the manual says it could sync data with a PC using either the "optional" RS-232 serial cable. At casio they have 2 serial cables but none of them even mention the A22T, anyone knows which one should work?
At neither (Casio web site or the manual) they mention what's the connector on the PDA (so my client who studies electronics could make or at least attemp the cable) So the cable it's a DB9 to ??? so far, does somebody has any idea how could that cable be made. Please?
And finally it has a infrared port IRda compatible, we made one experiment with a crappy notebbok and did not work, I need to know if there's a IRda box that we could buy (better yet if it comes in USB), my client needs to upload to a computer some data he input on the PDA.
Please any1 mail me leonbg@racsa.co.cr