Use a rs485 communication module

Great! Now you need to try:

var g = Graphics.createArrayBuffer(8,7,1);
g.drawLine(0,0,7,7);
Serial1.write([0x80,0x87,0xFF],g.buffer,­[0x8F]);

You can even use stuff like g.drawString("Hello",x,y), and you can change rotation with g.setRotation(1) (2, or 3).

(I made the graphics 8px x 7px so that each row/column aligns properly)