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6.9
SET THRESHOLD
(10 H )
BIT
BYTE
07
06
05
04
03
02
01
00
------1-----1------1------1------1------1------1------
00
0
0
0
1
0
0
0
0
01
Logical Unit Number
I
Reserved (0)
02
Reserved (0)
03
Reserved (0)
04
Bytes to be Transferred (01)
05
Reserved (0)
1
Flag
1
Link
Figure 6-16.
SET THRESHOLD Command
The ACB-5500 optionally provides an error logging
capability for
those errors that are normally retried without any notification
to the host system.
The ACB-5500 counts blocks transferred, seek
errors, and retried and corrected data errors.
The error logging
mode and the frequency of error presentation is established by
the SET THRESHOLD command, while the actual error information is
presented by the READ/RESET USAGE COUNTERS command.
The default
state is error logging, but not reported.
Power on reset estab-
lishes the default state.
One byte of parameter data will be transferred.
BIT
BYTE
07
06
05
04
03
02
01
00
------1-------1------1------1------1------1------1------
Threshold Value
"A threshold value of 0 specifies that no error reporting will
take place.
A value between 1 and 255 will request that error
reporting takes place.
When the number of errors of any single
type exceeds the threshold, the command that finds that
error is
completed normally.
All subsequent commands will be terminated
immediately with Check Condition.
Sense status will indicate
2C H ,
Error Count Overflow.
When a READ/RESET USAGE COUNTER
command is executed, the usage and error counters are off loaded
and normal operation continues.
The same threshold value remains
in effect.
500504-00
6-25
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