If I were to type in #7e, I would expect to see 7e (in hex) in the receiving device.  But what I see happening is your software first sends, the acsii character for #, then the ascii character for 7, and then the ascii character for e.   Am I missing something? 

When using advanced serial port monitor, I want to enter hex bytes directly, then I want these bytes to be sent as I have entered them. 

In other words, I want to input the hex data bytes exaclty as how I want them to be sent.

I do not want to enter a hex byte and have the ascii code sent.