RXD
(Host TXD)
TXD
(Host RXD)
5
2
3
T
2
This duration
must be less
than Host-
character delay.
Note 1
1
4
BEEP
T
1
T
3
T
4
Note 1: The Host-character delay determines the maximum time the scanner waits between characters
transmitted by the host before discarding the received data and declaring an error. The default value is
200 ms.
1.Host sends 0x00 to wakeup scanner
2.Host sends 1/2 BEEP command
3.Host sends remainder of BEEP command
4.Beeper of scanner beeps
5.Scanner sends an ACK
Note: T
1
and T
2
are determined by host(T
1 =
15ms, T
2
<200ms),T
3
and T
4
are determined by scanner(T
2
≈
380us，T
3
≈150us).
Figure 6-3 Host initiated transaction with pausing during transmission
RXD
(Host TXD)
TXD
(Host RXD)
3
2
(T
2
>200 ms)
1
T
1
1.Host sends 0x00 to wakeup scanner
2.Host sends 2 characters of a command
3.Scanner waits for a character, times out then sends a NAK
Note: T
1
and T
2
are determined by host (T
1 =
15ms, T
2
>200ms).
Figure 6-4 Error transmission: Host sends only the first 2 characters of a command
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