how the serialport read the hex value

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VB

serial-port

hello all..

my program is based on print the text through printer.i took font size as hex value (my printer firmware support font size as hex value ) i want to send the hex value to serial port the serial port get & set the hex value and read the value.

str = TextBox1.Text
Dim w As String = ""             'declare w as string
w = Hex(27) + Hex(33) + Hex(12)   'convert decimal to hex
serialport1.write(str)             'write the text

thx
bhagavath