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Sequence 1
H
S
P
S
S
RXD
T
0 1 0 0 0 0 0
0
B
P
T
0 0 1
0
1
0
1
0
B
B
B
L
H
TXD
L
H
CTS
L
H
RTS
L
H
DTR
L
H
DSR
L
t
Sequence 2
Note 1
1
P
S
B
P
B
S
P
S
S
T
1 1 1 1 1 1 1 1
B
P
T
0
0 1 0 0 0 0 0
B
B
B
t
2
t
: Less than 500 ms
1
t
: More than 1 byte
2
Sequence 1:
The host computer send the READ command to the scanner.
Sequence 2:
ACK for the READ command is sent to the host computer.
Sequence 3:
Response for the READ command (read complete) is sent to the scanner.
Sequence 4:
ACK for the read complete is sent to the scanner.
Note 1:
Expect issuing read complete, the RTS signal is inhibitory taking low level.
Figure 6.8 Read command sequence
Sequence 3
P
S
S
P
S
S
P
S
S
B
P
T
0 1 1
0 0 0 1 0
B
P
T
0 0 0 0 0 1 1 1
B
P
T
1 0 0 0 0 0 0 0
B
B
B
B
B
B
X'02', '5A'
X'FF'
X'04', '46', 'E0', '01'
t
Sequence 4
1
S
P
S
T
1 1 1 1 1 1 1 1
B
P
B
B
P
S
B
P
B
t
2
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