I'm trying to interface this rs232 serial card reader
(female db9 port, port powered) with my USB Arduino. (I know there are other/better ways to interface with a card reader, but this is all I have at the moment and I'm trying to get a prototype out the door ASAP)
I'm played around with the ttl to rs232 adaptor
, but had no luck (presumably because it's designed to hook into a computer's rs232 port, or at least a powered port)
I've seen alot about the max232 chip, but I'm not sure that it's going to help me.
Any suggestions to get something running with the supplies I have? Thanks!