Filter
Top Products
Figure 6.10 Return Sense 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 3
S
T
B
S
T
B
0100000
P
B0
S
P
B
S
T
B
1
S
T
B
11111111
P
B
S
P
B
0100000
P
B
S
P
B
S
T
B
01110011
P
B
S
P
B
S
T
B
00000111
P
B
S
P
B
S
T
B
11000000
P
B
S
P
B
0
Sequence 4
S
T
B
11111111
P
B
S
P
B
0 000010
P
B
S
P
B
t
2
t
1
t
2
t
1
: Less than 500 ms
t
2
: more than 1 word length
Sequence 1: The host computer sends the RETURN SENSE command to the scanner.
X`02', `42'
Sequence 2: ACK for the RETURN SENSE command is sent to the host computer.
X`FF'
Sequence 3: Response for the RETURN SENSE command is sent to the host computer.
X`04', `4E', `E0', `01'
Sequence 4: ACK for the response (issued at Sequence 3) is sent to the scanner.
X`FF'