Fujitsu M3097DG, Oem Manual

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A.7 Command Sequence
Appendix A-123
Notes:
1. If the requested transfer volume is not equal to the actual data volume, this scanner informs the
initiator that the requested transfer amount is abnormal. This is done as the scanner returns the
status 00001 (CHECK CONDITION) and creates the following sense data:
•
ILI = 1
•
INFORMATION = requested transfer amount (TL) - actual data amount
This status is usually sent to the last READ command of the sequence. (For commands other than
the last READ, the GOOD status is reported.) If the data amount requested by the last READ
command agrees with the last data amount left, the GOOD status is reported to the READ command,
and the CHECK CONDITION status is reported to the next READ command.
2. In addition to the means described above in Note 1, the initiator has another means for ascertaining
the completion of transfer of image data for one window. Specifically, the initiator issues the
REQUEST SENSE command after each completion of the READ command, and if the sense data
received in response is NO SENSE, the initiator checks the EOM bit in the sense data:
EOM bit = 0 . . . There is scan data yet to be transferred.
EOM bit = 1 . . . All scan data has been transferred.
However, issuing the REQUEST SENSE command after each completion of the READ command is
not desirable in terms of processing efficiency.
3. Once all scan data has been transferred, the CHECK CONDITION status is always reported to the
READ command that follows. Before attempting another read, first issue the SET WINDOW
command.
4. Enable or disable of disconnection is decided by bit 6 of the IDENTIFY message issued by the
initiator at the READ command. The initiator that requires disconnection must set bit 6 of the
IDENTIFY message. When the CMP II option is not provided, the disconnection is not performed
even if bit 6 of the IDENTIFY message is set.