Mode Select (10)
96122 • Revision: F Chapter 6 SCSI Commands 123
Test Modes
Two test mode options are supported in the current TapeAlert implementation.
Test Mode for All Bits Supported
Using the mode select command to initiate this test will set all of the flags
supported by the TapeAlert implementation in the TapeAlert log page. The
TapeAlert log sense page then can be read to give the host a snapshot of the
supported flags.
The flags will be cleared when the page is read. To do this, set the test mode flag in
the TapeAlert mode select page. This indicates that the Report Count/Test Flag
Number field is in Test Flag Number mode. Next, set the test flag number to
0x7FFF and issue the Mode Select command. When the command is complete, the
TapeAlert log sense page can be read.
Test Mode for Individual Bits
Another test mode allows individual bits to be turned on. This can be useful for the
host to debug/test operator interfaces.
Any flag set must be a supported flag. If the flag is not supported, a check
condition with an incorrect parameter code is returned. The TapeAlert log sense
page then can be read to allow the host to get a log page with the flag of interest
set. The flag will be cleared when the page is read.
To test a flag, set the Test Flag in the TapeAlert mode select page. This indicates the
Report Count/Test Flag Number field is in Test Flag mode. Set the number of the
flag to be tested. Issue the Mode Select command. When the command is complete,
the TapeAlert log sense page can be read.
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