B. printable prefix codes – Western Telematic CAS-161A User Manual
Page 16
B.
Printable Prefix Codes
Since the Prefix code is transmitted through the opened port, it is
best to select a non-printable Prefix Code. The procedure for
selecting the Prefix Code is described in Section 3. If your
application requires a printable code, refer to the ASCII code
chart below. Remember:
·
Switch positions 1 - 7 correspond to ASC bits B1 - B7 on
the chart.
·
Switch positions should be ON for a 0 and OFF for a 1.
Example: To select the “@” character for a printable Prefix
code: B1 - B7 on the chart shows 0 0 0 0 0 0 1 for “@”.
Therefore, Sw1 - Sw6 should be ON and Sw7 OFF.
B7 ¾¾¾¾¾¾¾¾¾¾¾¾¾¾®
0
0
0
0
1
1
1
1
B6 ¾¾¾¾¾¾¾¾¾¾¾¾¾¾®
0
0
1
1
0
0
1
1
B5 ¾¾¾¾¾¾¾¾¾¾¾¾¾¾®
0
1
0
1
0
1
0
1
Bits
®
b4
¯
b3
¯
b2
¯
b1
¯
Col®
Row¯
0
1
2
3
4
5
6
7
0
0
0
0
0
NUL DLE
SP
0
@
P
`
p
0
0
0
1
1
SOH DC1
!
1
A
Q
a
q
0
0
1
0
2
STX DC2
“
2
B
R
b
r
0
0
1
1
3
ETX DC3
#
3
C
S
c
s
0
1
0
0
4
EOT DC4
$
4
D
T
d
t
0
1
0
1
5
ENQ NAK
%
5
E
U
e
u
0
1
1
0
6
ACK SYN
&
6
F
V
f
v
0
1
1
1
7
BEL ETB
¢
7
G
W
g
w
1
0
0
0
8
BS
CAN
(
8
H
X
h
x
1
0
0
1
9
HT
EM
)
9
I
Y
i
y
1
0
1
0
10
LF
SUB
*
:
J
Z
j
z
1
0
1
1
11
VT
EXC
+
;
K
[
k
{
1
1
0
0
12
FF
FS
,
<
L
\
l
|
1
1
0
1
13
CR
GS
-
=
M
]
m
}
1
1
1
0
14
SO
RS
.
>
N
^
n
~
1
1
1
1
15
SI
US
/
?
O
_
o
DEL
Apx-2
Appendices