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Figure 6.8 Read command sequence
H
L
RXD
H
L
TXD
H
L
CTS
H
L
RTS
H
L
DTR
H
L
DSR
Sequence 1 t
1
Sequence 2 Sequence 3Note 1
S
T
B
S
T
B
0 1 0 0 0 0 0
P
B
0
S
P
B
S
T
B
1 1 1 1 1 1 1 1
P
B
S
P
B
0 1 0 0 0 0 0
P
B
S
P
B
S
T
B
0 1 10
t
2
Sequence 4
S
T
B
1 1 1 1 1 1 1 1
P
B
S
P
B
0 0 0 1 0
P
B
S
P
B
S
T
B
0 0 0 0 0 1 1 1
P
B
S
P
B
S
T
B
1 0 0 0 0 0 0 0
P
B
S
P
B
t
2
t
1
S
T
B
0 0 1 10 0 01
S
P
B
P
B
t
1
: Less than 500 ms
t
2
: More than 1 byte
Sequence 1: The host computer send the READ command to the scanner.
X‘02’, ‘5A’
Sequence 2: ACK for the READ command is sent to the host computer.
X‘FF’
Sequence 3: Response for the READ command (read complete) is sent to the scanner.
X‘04’, ‘46’, ‘E0’, ‘01’
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.