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ERROR FIXEDcasio calculator pinout. Have you mixed up rs232 txd (should be pin 2) and rxd (pin 3) and casio tx and rx in this diagram? APPROVED
CORRECTIt works!APPROVED
CORRECTIn response to that other comment Ive just seen:
THE CIRCUIT IS NOT WRONG. I HAVE JUST BUILT AND TESTED IT. IT WORKS FINE.
Pin 2 IS RXD on a 9-pin D-type serial connector (and pin 3 is TXD).
On a 25-pin connector however, they would be the other way round!
APPROVED


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Pinouts.ru > Pinout of Casio calculator cable and layout of 9 pin D-SUB female connector and 3 pin stereo plug connector
should be correct