Chapter-5
Interface
D) ACK/NAK Control
In ACK/NAK mode, the scanner will transmit data and expects to receive one of the following
responses from the host:
Response: "ACK" (ASCII:0x06)
The scanner terminates transmission with the good-read buzzer.
Response: "NAK" (ASCII:0x15)
The scanner sends the data again.
Response: "DC1" (ASCII:0x11)
The scanner terminates transmission without the good-read or error buzzer.
Timeout
If there is no response within 1 second, the scanner terminates transmission with the error buzzer.
<ACK/NAK Flow chart>
BUZERn
RxD
TxD
Scanner
Host System
RxD
TxD
Decode
Finish
Send
ACK Wait
Buzzer
ACK
LabelA LabelB
LabelB Read
Processing
Start of transmission
Transmit data
Start 1 sec. timer As configured
Response received
Timer ended
Response = NAK
Response = ACK
Response = DC1
ERROR Buzzer ERROR Buzzer GOOD READ Buzzer
END
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
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