1.5 UNIT ATTENTION ConditionC141-C010 1-21• Power on [=29-01]• Reset [=29-02]• TARGET RESET [=29-03]• Transciever Mode Changed to SINGLE-ENDED [=29-05]• Transciever Mode Changed to LVD [=29-06]• Mode parameters changed [=2A-01]• Reservations Preempted [=2A-03]• Reservations Released [=2A-04]• Registrations Preempted [=2A-05]• Commands cleared by another INIT [=2F-00]• Spindle synchronized [=5C-01]• Spindle not synchronized [=5C-02]• Microcode has been changed [=3F-01]• Changed Operating Definition [=3F-02]• Device Identifier Changed [=3F-05]However, if the IDD responds with a BUSY status or TASK SET FULL status due to its not being able toreceive the command that was issued, the UNIT ATTENTION condition is not cleared.The above CHECK CONDITION status response that is the cause of the UNIT ATTENTION conditionhold can be prohibited by the specification of the CHANGE DEFINITION command. When the CHECKCONDITION status response is prohibited, the IDD executes the commands it receives normally, exceptin the case of a RESERVATION CONFLICT status, BUSY status or TASK SET FULL status. In thiscase, the UNIT ATTENTION condition for the INIT that issued that command is cleared.See Section 3.1.4 “CHANGE DEFINITION” concerning setting details.(2) INQUIRY commandThe INQUIRY command is executed normally, but the UNIT ATTENTION condition is not cleared.(3) REQUEST SENSE commandOne of the following operations is performed depending on whether or not the IDD is in the sense datahold state (shown in Section 1.6).a. In the case of a Sense Data Hold stateThe IDD executes the REQUEST SENSE command normally and sends the sense data which arebeing held to the INIT. In this case, the UNIT ATTENTION condition is not cleared.b. In the case of a State other than a Sense Data Hold stateThe IDD executes the REQUEST SENSE command normally and sends the sense data whichindicate the UNIT ATTENTION condition and are being held to the INIT. At this time, the UNITATTENTION condition for that INIT is cleared.
