3.12 Computer Interface Option
Character
BS
LF
CR
PR
SP
#
(
)
*
+
-
.
0
1
2
3
4
Transmission
protocol
Control
characters
Table 3-7. ASCII Conversion
Value (hex)
Character
Value
Character
Value
o* (backspace)
5
35
L
4C
oA (line feed)
6
36
M
4D
OD (carriage return) 7
37
N
4E
OE (print)
8
38
0
4F
20 (space)
9
39
p
50
23
28
29
2A
2B
2D
2E
30
31
32
33
34
:
3A
Q
51
A
41
R
52
B
42
s
53
C
43
T
54
D
44
u
55
E
45
V
56
F
46
w
57
G
47
X
58
H
48
y
59
I
49
z
5A
J
4A
K
4B
Note
ASCII characters can be strung together to form commands.
ASCII commands are listed under CMD functions and
Computer Interface Commands (See Subsection 3.13).
As each character is transmitted to the DIGlTEL, it is echoed back to
the device to verify that the character was received. The DIGITEL
expects to receive 7-bit characters with one stop bit (parity is ignored).
It transmits 7-bit characters with one stop bit and even parity.
The computer interface uses two special control characters:
• Backspace [BS], sent to the DIGITEL, deletes the previous
character. If there is no previous character (at the start of the line
for example), the command is ignored (BS is not echoed).
• Print red [PR], transmitted by the DIGITEL, tells the printer to
print a line of red text. PR occurs at the beginning of a line and
indicates an exception report that occurred in autolog mode.
3-20
Operation
