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Figure 6.5 Clear command sequence
PSS
BPT
BB
11000000
S
T
B
0000000000100010
PSS
BPT
BB
H
L
RXD
H
L
TXD
H
L
CTS
H
L
RTS
H
L
DTR
H
L
DSR
PS
BP
B
Sequence 1
t
2
11111111
S
T
B
PS
BP
B
01000000
S
T
B
PSS
BPT
BB
01001010
PS
BP
B
t
1
Sequence 2
11111111
S
T
B
PS
BP
B
t
3
Sequence 3 Sequence 4
Note 1
t
2
t
3
t
1
: more than 1 word length (changed by data transfer rate)
t
2
: less than 500 ms
t
3
: less than 5 s
Sequence 1: The host computer sends the CLEAR command to the scanner.
X`03', `44', `00'
Sequence 2: ACK for the CLEAR command is sent to the host computer.
X`FF'
Sequence 3: Response for the CLEAR command is sent to the host computer.
X`02', `52'
Sequence 4: ACK for the response (issued at Sequence 3) is sent to the scanner.
X`FF'
Note 1:
During the CLEAR command execution, DTR signal takes low level.