"What is your problem?

If you have the string "$0#1", then that is already stored in memory as 0x24302331 - in fact, as 0x24 0x30 0x23 0x31.
You already have it - you don't need to convert anything!"

Andy, I think that the OP's original question does make it quite clear that he wants a string representation of the binary values expressed in hex. Notice repeated use of the word 'string':

"The string is stored in ASCII format, I need to store the HEX version of the string in a string"