A.6 Messages
Appendix A-107
When a target is released from the BUSY status, it will not issue a notification of the release. Therefore,
the initiator needs to check the status of units
periodically and needs to issue the command again.
A.6 Messages
This section describes the detection of an ATN signal and explains the types of messages supported by this
scanner.
A.6.1
ATN detection
The following table summarizes the timing at which this scanner detects an ATN signal.
Phase
ATN detection timing
SELECTION
Immediately before a phase change
COMMAND
Immediately before a phase change
DATA OUT
Immediately before a phase change
DATA IN
Immediately before a phase change (*1)
STATUS
Immediately before a phase change
MESSAGE OUT
Upon each reception of a message
MESSAGE IN
Upon each transmission of a message
*1
This scanner detects ATN signal for every Read command during an image data transmission.
When an ATN signal is detected, scanning operation is interrupted.
A.6.2
Message types
Messages provide information consisting of one or more bytes that are transferred in the MESSAGE
IN and MESSAGE OUT phases. These messages are used to control the bus phase sequence.
The initiator creates an ATTENTION condition for the target, indicating that it has a message to be
reported to the target. Only then the target switches to the MESSAGE OUT phase to receive the
message.
If the target has completed the SELECTION/RESELECTION phase, it can execute the MESSAGE
IN phase at any time to send the message to the initiator.
The messages that can be communicated with this scanner are listed in the following table.
Summary of Contents for M3097DG
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