how do i code this string

I am working with a tandem emulator which has a send key function.
  autoit send and controlsend do not work. i have the following instructions


The following keystroke codes can be used with the Send Key function.  These are all extended keystroke codes and must be preceded by a hex ff byte in the send key buffer.


key_alt_esc     1
key_alt_backspace    14
key_shift_tab   15
key_alt_q   16

  how would i code a string in the autoit script for say, key_alt_q ?