8
Optional 2x20 LCD Character Display
The 2x20 character display is an alpha numeric LCD with back light. It is driven by a serial interface
controller and normally set at COM4. The board receives control and character codes which are then
displayed on the LCD. This is a receive -only device.
Power-Up Initialization:
Upon power-up, the controller goes into its initialization sequence. The board is designed to initialize in
two states: (1) the physical power up, then (2) the software power up. After 250mS, the board is ready to
receive software power up. YOU
MUST
SEND THE BOARD A CLEAR SCREEN COMMAND (HEX
0C) TWO TIMES AT HALF SECOND INTERVALS. This will initialize the controller completely. The
LCD display is NOT hot pluggable or hot swappable!
Communications Settings: 9600,N,8,1, COMx
Character Codes
0
1
2
3
4
5
6
7
0
Space
0
@
P
`
P
1
pass char
!
1
A
Q
a
Q
2
reject char
"
2
B
R
b
R
3
hide
#
3
C
S
c
S
4
Invisible cursor
$
4
D
T
d
T
5
Underscore cursor
%
5
E
U
e
U
6
block cursor
&
6
F
V
f
V
7
home
'
7
G
W
g
W
8
backspace
(
8
H
X
h
X
9
forward
)
9
I
Y
i
Y
A
line feed
*
:
J
Z
j
Z
B
up
+
;
K
[
k
{
C
clear
,
<
L
\
l
|
D
Carriage return
-
=
M
]
m
}
E
.
>
N
^
n
~
F
/
?
O
_
o
Delete
