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DIDS-40Z-ZAMI3
Table 4-1.
ASCII Control Codes (Cont) .
Code
Nam.e
De scription
b7
b6
b
S
b 4
b 3
bZ
bl
ETB
End of Transm.is sion Block
a
0
1
0
1
1
1
CAN
Cancel
a
0
1
1
0
a
0
EM
End of Me dium
0
0
1
1
a
a
1
SUB
Substitute
0
0
1
1
a
1
0
ESC
Escape
0
a
1
1
0
1
1
FS
Final Separator
a
0
1
1
1
a
0
GS
Group Separator
a
0
1
1
1
a
1
RS
Record Separator
a
0
1
1
1
1
0
US
Unit Separator
a
0
1
1
1
1
I
DA
*
Device Addre s s (1 )
-
0
a
a
a
a
0
DA
*
Device Addre s s (64)
-
1
I
I
1
1
1
**
Write Directive
a
x
x
x
x
x
x
**
Read Directive
1
X
X
X
X
X
X
*
Enquiry Re sponse Mode
**
Polling Mode Only,
XIS represent any DA
a.
The parity bit, ba. will be a 1
if
the number of I' s contained in a bi
through b7 are odd and a 0
if
the num.ber of I' s is even.
b.
The start bit, bO
l
is always a SPACE (-6v::l::l v) and is always the
first bit of a character; thus, the information bits (bi through b7)
are always transmitted LSB fir st.
The start bit is used to inform.
either the CPU or the Display Terminal that a data character is
being received.
bZ
DATA BITS
Figure 4-4.
Character Form.at
4-10
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