Mindeo FS580 - Page 106

100
RXD
(Host TXD)
TXD
(Host RXD)
4
2
1
3
BEEP
T
1
T
2
T
3
1.Host sends 0x00 to wakeup scanner
2.Host sends 2 BEEP commands instead of 1
3.Scanner responses the first BEEP command
4.Scanner sends an ACK
Note: T
1
is determined by host(recommend 15ms),T
2
and T
3
are determined by scanner(T
2
≈380us，
T
3
≈150us).
Figure 6-5 Error condition: Host sends 2 valid BEEP commands back to back
RXD
(Host TXD)
TXD
(Host RXD)
1 4
62
5
3
BEEP
T
1
T
2
T
3
T
4
1. Scanner transmits decoded data (data packet)
2. Host causes scanner’s transmission aborted by sending BEEP
3. Beeper of scanner beeps
4. Scanner sends an ACK
5. Engine resends data
6. Host sends an ACK
Note: T
1
and T
4
are determined by host,T
2
and T
3
are determined by scanner(T
2
≈380us，T
3
≈150us).
Figure 6-6 Host causes engine to abort transmission