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M3099GX/GH OEM Manual 3-7
INTERFACE
Note: The minus sign next to a signal indicates active low.
The lines labeled RESERVED in the ‘A’ cable contact
assignment tables shall be connected to ground in the bus
terminator assemblies or in the end devices on the SCSI cable.
The RESERVED lines should be open in the other SCSI
devices, but may be connected to ground. The RESERVED
lines in this scanner are opened.
SCSI Bus (See ANSI SCSI-2 4.5)
Communication on the SCSI bus is allowed between only two SCSI
devices at any given time. There is a maximum of eight SCSI devices.
Each SCSI device has an SCSI ID bit assigned as shown in Figure
3.4.
Figure 3.4 DATA BUS
SCSI ID
DB(0)
ID=0
DB(1)
ID=1
DB(2)
ID=2
DB(3)
ID=3
DB(4)
ID=4
DB(5)
ID=5
DB(6)
ID=6
DB(7)
ID=7
#03.pm5 98.2.22, 1:31 PM7