Epson GT-6500 EN - Manual (Page 171)

ID Switch Setting
The SCSI ID is set with the ID switch mounted on the back of the
scanner.
The ID switch numbers correspond to the available ID and can be
set from 0 to 7. The numbers 8 and 9 should not be used.
Command Chart
This device uses the following group 0 processor commands.
Code Command Description
00H TEST UNIT READY Ready for operation confirmation
03H REQUEST SENSE Sense data request (*1)
08H RECEIVE Data transfer from target
0AH SEND Data transfer from initiator
12H INQUIRY SCSI device data request (*2)
*1 For sense data returned by the REQUEST SENSE command, only the extension
sense data format is supported.
*2 The INQUIRY data returned by the INQUIRY command is as follows:
Interface Specifications A-9