Omega A2400 User Manual
Page 42
SetUp Command 5-3
to communicate with a module with an unknown address is with the Default
Mode.
The most significant bit of byte 1 (bit 7) must be set to ‘0’. In addition, there
are six ASCII codes that are illegal for use as an address. These codes are
$00, $0D, $24, $23, $7B, $7D which are ASCII codes for the characters
NUL, CR, $, #, {, and }. Using these codes for an address will cause an
ADDRESS ERROR and the setup data will remain unchanged. This leaves
a total of 122 possible addresses that can be loaded with the SU command.
It is highly recommended that only ASCII codes for printable characters be
used ($21 to $7E) which greatly simplifies system debugging with a dumb
terminal. Refer to Appendix A for a list of ASCII codes. Table 5.1 lists the
printable ASCII codes that may be used as addresses.
Table 5.1 Byte 1 ASCII Printable Characters.
HEX
ASCII
HEX
ASCII
HEX
ASCII
HEX
ASCII
21
!
3A
:
51
Q
68
h
22
“
3B
;
52
R
69
i
25
%
3C
<
53
S
6A
j
26
&
3D
=
54
T
6B
k
27
‘
3E
>
55
U
6C
l
28
(
3F
?
56
V
6D
m
29
)
40
@
57
W
6E
n
2A
*
41
A
58
X
6F
o
2B
+
42
B
59
Y
70
p
2C
,
43
C
5A
Z
71
q
2D
-
44
D
5B
[
72
r
2E
.
45
E
5C
\
73
s
2F
/
46
F
5D
]
74
t
30
0
47
G
5E
^
75
u
31
1
48
H
5F
_
76
v
32
2
49
I
60
‘
77
w
33
3
4A
J
61
a
78
x
34
4
4B
K
62
b
79
y
35
5
4C
L
63
c
7A
z
36
6
4D
M
64
d
7C
|
37
7
4E
N
65
e
7E
~
38
8
4F
O
66
f
39
9
50
P
67
g