Yoonhee,

I don't know if it is a type, but you used .input instead of .output.

Try:

Thisform.olecontrol1.NullDiscard=.F.
Thisform.olecontrol1.EofEnable=.F.
Thisform.olecontrol1.Outbuffersize=512
Thisform.olecontrol1.OUTPUT = chr(0xAA)+chr(0x34)+chr(0x00)+chr(0x01)+chr(0x00)+chr(0x01)

hth,