Hi Juan
Ouch! $136USD for a basic text display...
Why not try using the I2C instead of RS232? If short distance isn't a factor, you won't need to buy another part, just add a couple of 4.7K resistors and assign 2 pins using the I2CWRITE commands. It looks pretty straightforward, and if only using text it should not be a problem. I read in the the MO forum that you cannot download fonts or graphics with I2C.
Good luck.
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