CHARACTERS THAT CAN BE DISPLAYED
ASCCI CODE (HEX)	CHARACTER
0x20			 (SPACE) 
0x21			! NOT DISPLAYED (blank)
0x22			" NOT DISPLAYED (blank)
0x23			# NOT DISPLAYED (blank)
0x24			$
0x25			%
0x26			& NOT DISPLAYED (blank)
0x27			'
0x28			(
0x29			)
0x2A			*
0x2B			+
0x2C			,
0x2D			-
0x2E			.
0x2F			/
0x30			0
0x31			1
0x32			2
0x33			3
0x34			4
0x35			5
0x36			6
0x37			7
0x38			8
0x39			9
0x3A			: NOT DISPLAYED (blank)
0x3B			; NOT DISPLAYED (blank)
0x3C			<
0x3D			=
0x3E			>
0x3F			? tests all segments ON
0x40			@
0x41			A
0x42			B
0x43			C
0x44			D
0x45			E
0x46			F
0x47			G
0x48			H
0x49			I
0x4A			J
0x4B			K
0x4C			L
0x4D			M
0x4E			N
0x4F			O
0x50			P
0x51			Q
0x52			R
0x53			S
0x54			T
0x55			U
0x56			V
0x57			W
0x58			X
0x59			Y
0x5A			Z
0x5B			[
0x5C			\
0x5D			]
0x5E			^
0x5F			_ (UNDERSCORE)