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Table 4.22
Code Status of unit
00100 BUSY
A target or logical unit cannot accept a new command.
• The logical unit is executing processing.
• The target is executing processing on a specified logical unit or other logical unit.
• The target intends to report to an other initiator the sense data of a specified logical unit.
• The target intends to report to an other initiator the sense data of a logical unit that was not specified.
• The target intends to report the status to any initiator.
01100 RESERVATION CONFLICT
• The specified unit is already reserved by another initiator.
When a target is released from the BUSY status, it will not issue a notification of the release. Therefore initiator needs to
check the status of units periodically and needs to issue the command again.
4.6 Messages
This section describes the detection of an ATN signal and explains the types of messages supported by this scanner.
4.6.1 ATN detection
The following table summarizes the timing at which this scanner detects and ATN signal.
Table 4-23
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
STATUS Immediately before a phase change
MESSAGE OUT Upon each reception of a message
MESSAGE IN Upon each transmission of a message