Serial communication and the arduino interfacing with a BPP-420 need help!

Ok, so I'm trying to interface the arduino uno with a bpp 420 found here

http://seetron.com/bpp420/bpp420prog.html#serial

One quirk I found that the data needs to be inverted when the data is sent to the arduino,

my question is has anyone used this and got it to work? If not mind helping me figure this out?

so far I've tried simple programs in the void setup like

Serial.begin(9600); Serial.write("hello");

I have the serial line to the TX pin(pin1)on the arduino.

but the lcd screen just prints a lot of random gibberish

I've gotten the screen to work on a pic axe microcontoller but I have limited knowledge the on arduino.

thank you for your help in advanced!