Scsi Commands - Epson ES-1000C Reference Manual

SCSI Commands

The commands supported by EPSON scanners are explained
below.
If the Link, Flag, and reserved bits of a command are a value other
than 0, an error occurs and the command is not executed.
1. Test Unit Ready
If the scanner is ready for operation, Good status is sent; if an
error occurs at this time, Check Condition status is sent.
2. Request Sense
The sense data in the scanner is sent when a request is
received. Sense data is 8-byte data in the extension sense
data format.
The number of sense data bytes sent is determined by
specifying the assigned length. If more than 8 bytes are
specified, 8 bytes of data are sent and then Data In Phase
ends. If a length of 0 is specified, 4 bytes of sense data are
sent. See Sense Data for details.
3. Inquiry
Device type data for the scanner is sent. There are 40 bytes of
Inquiry data. Refer to SCSI specifications for a description of
Inquiry data. The number of bytes of Inquiry data sent at this
time is determined by specifying the assigned length. If more
than 40 bytes are specified, 40 bytes of data are sent and then
Data In Phase ends. If a length of 0 is specified, an error will
not occur, but no data will be sent and the command will be
terminated.
Interface Specifications
A-15