I want to send Ascii codes to an mbed and have it print Ascii characters which can be seen from Hyperterminal. How can this be done? I looked at the mbed website and found nothing about keyboard input or ascii characters.
ASCII printable characters are just bytes with values in the range of 32 to about 127. If your mbed receives ASCII, it should simply pass it to the output unchanged.
If it doesn't work, then the problem is in connection between mbed and whatever you want it to send text to.