User guide

SC35 User Guide Ver 4.8 August 30, 2002 Page 12 of 25
3.3.7 Inquiry Command – 12h
The INQUIRY command requests that information regarding parameters of the
SC35 be sent to the initiator.
Inquiry CDB
An enable vital product data (EVPD) bit of one specifies that the SC35 return the
optional vital product data specified by the page code field. If any optional fields
in the CDB are set that the SC35 does not support, it will return a CHECK
CONDITION status with the sense key set to ILLEGAL REQUEST and an
additional sense code of INVALID FIELD IN CDB.
An EVPD bit of zero specifies that the SC35 return the standard INQUIRY data.
If the page code field is not zero, the target shall return CHECK CONDITION
status with the sense key set to ILLEGAL REQUEST and an additional sense
code of INVALID FIELD IN CDB. The page code field specifies which page of
vital product data information the SC35 return.
The INQUIRY command shall return CHECK CONDITION status only when the
target cannot return the requested INQUIRY data. The INQUIRY data should be
returned even though the peripheral device may not be ready for other
commands. If an INQUIRY command is received from an initiator with a
pending unit attention condition, the SC35 will perform the INQUIRY command
and not clear the unit attention condition.