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Completion of command
transmission
Abnormal reception
Response retransmission
(only twice)
Response transmission
end
Host Computer Scanner
ACK
Other than ACK
Command
Command retransmission
(only twice)
Abnormal reception
Normal reception
$ Command processing
$ Operation
Response
Normal reception
ACK
Other than ACK
Notes:
1. Abnormal reception means that a parity error, flaming error, overrun error, or
count error has occurred.
2. Command or response transmission is retried only twice.
3. Upon reception, a command or response is checked for transmission errors. When
the check result has no problem, ACK is returned immediately to the originating
source. When the check result has problem, data other than ACK is returned after
all data has been received.
4. The originating source of the command/response monitors the response from the
receiving side. ACK indicates that command/response transmission is completed.
Data other than ACK causes the command/response to be transmitted again. The
transmission is retried only twice. After that, the scanner waits for a new
command.
5. Response data such as ACK must be returned to the originating source within 0.5
second.
6. The interval between words in the data steam must be no more than 10 ms.
Figure 6.1 Basic command/response sequence
6 $ 2 50FH5037E>02