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C141-E035-02EN 5 - 15
5.6.2 Checking SCSI connection
When the initial operation is checked normally after power is turned on, check that the IDD is
connected to the SCSI bus from the host system. Although checking the connection depends
on the structure of the host system, this section describes the general procedures.
(1) Checking procedure
Issuing the commands and determining the end status depends on the start mode of the spindle
motor and UNIT ATTENTION report mode (specified with setting terminal). Figure 5.4
shows the recommended checking procedure for the mode that the motor starts when power is
turned on. Figure 5.5 shows for the mode that the motor starts by the START/STOP
command. In these recommended checking procedures, following items are checked.
Note:
Following steps a) to e) correspond to a) to e) in Figures 5.4 and 5.5.
a) Issue the TEST UNIT READY command and check that the IDD is connected
correctly to the SCSI bus and the initial operation after power is turned on ended
normally. The command issue period of the TEST UNIT READY command shall be
more than 20 ms.
b) To control starting of the spindle motor from the host system, issue the
START/STOP UNIT command to start the spindle motor.
c) Check the SCSI bus operations with the WRITE BUFFER and READ BUFFER
commands. Use data whose data bus bits change to 0 or 1 at least once. (Example:
Data with an increment pattern of X'00' to X'FF')
d) Start the IDD self-diagnostic test with the SEND DIAGNOSTIC command and check
the basic operations of the controller and disk drive.