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H
S
P S S
RXD
T
1 1 0 0 0 0 0 0
B P T
B
B B
L
H
TXD
L
H
CTS
L
H
RTS
L
H
DTR
L
H
DSR
L
Sequence 1
P S S
P S
0 0 1 0 0 0 1 0
B P T
0 0 0 0 0 0 0 0
B P
B B
B
t
: more than 1 word length (changed by data transfer rate)
1
t
: less than 500 ms
2
t
: less than 5 s
3
Sequence 1:
The host computer sends the CLEAR command to the scanner.
Sequence 2:
ACK for the CLEAR command is sent to the host computer.
Sequence 3:
Response for the CLEAR command is sent to the host computer.
Sequence 4:
ACK for the response (issued at Sequence 3) is sent to the scanner.
Note 1:
During the CLEAR command execution, DTR signal takes low level.
Figure 6.5 Clear command sequence
Sequence 2
t
1
t
2
S
P S
S
B P
T
1 1 1 1 1 1 1 1
T
0 1 0 0 0 0 0 0
B
B
B
t
3
Note 1
X`03', `44', `00'
X`FF'
X`02', `52'
X`FF'
Sequence 3
Sequence 4
S
T
1 1 1 1 1 1 1 1
B
t
2
P S S
P S
B P T
B P
0 1 0 0 1 0 1 0
B B
B
t
3
P S
B P
B
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