I am trying to  modify the ID-12 RFID reader example to work with the Parallax RFID reader ( differences 2400b vs default 9600b and non inverting data vs inverted data).  I am missing something as dev  board does not regocnize data.  Any ideas.

Did you ever get this to work? I'm trying to do the same thing, and having problems also. I am glad to hear your post about the inverting vs. non-inverting serial, because that SHOULD explain the problems, except that I tried one of the parallax Read/Write RFID cards, and it seems that I can SEND commands to the device (NOT the RDID Tag, just the reader) but the results come back jumbled..

DId you ever get it to work? WHich card did you use?

Is it possible that the OUTPUT is inverted on the Read/Write device, but not the INPUT?! (Or vice versa?)

I guess I'll throw a transistor and pull-up resistor on the output pin to see if I can get it to talk to the MBED, and test that, but I'd love to hear if anyone has had a success with that..

BTW - Where did you find the docs on which device is inverted, and which is not? I can't find that detailed doc on either the MBED, OR the RFID reader

-Steve