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3-14 M3099EX/EH OEM Manual
Command and
Response
Basic command/response sequence
Data is transmitted between the host computer and the image
scanner in the form of commands and responses. Figure 3.5 shows
the basic command/response sequence.
Command
ACK
Reception
error
ACK
Reception
error
Response
Scanner
Abnormal
reception
Response
transmission end
Response
retransmission
(only twice)
Host computer
Completion of
command transmission
Command
retransmission
(only twice)
Abnormal
reception
• Command
processing
• Operation
Normal reception
Normal reception
Figure 3.5 Basic command/response sequence