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NOTE:    
1.  This IR-pass-through code is different from the RCU key code.
2.  Special control sequence for POWER key under IR-pass through mode.
  2-1.   When TV/DS is OFF and receives the IR POWER code: TV/DS will turn itself on, then forward 
the POWER code to the host via RS232.
  2-2.   When TV/DS is ON and receives the IR POWER code: TV/DS will forward the POWER code to 
the host via RS232, then turn off itself.
  2-3.  When SET-POWER LOCK is enabled, the TV/DS will not respond to POWER key pressing.
3.  The VOLUME UP and VOLUME DOWN code will repeatedly output when you press and hold the keys.