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SCSI BUS
7-6 C156-E228-02EN
7.3 Physical Requirements
SCSI devices are daisy-chained together. Both ends of the interface cable are
terminated with resistors.
7.3.1 Interface connector
The nonshielded SCSI connector installed on the ODD is a 50-conductor
connector consisting of two rows of 25 male pins with adjacent pins 2.54 mm (0.1
in.) apart. See Figure 7.4.
The nonshielded cable connector shall be a 50-conductor connector consisting of
two rows of 25 female contacts with adjacent contacts 2.54 mm (0.1 in.) apart. The
use of keyed connectors is recommended to prevent accidental misinsertion. See
Figure 7.5.
Figure 7.6 shows the nonshielded connector pin assignments for SCSI.
Symbol mm Remark
D1 2.54 ————
D2 2.54 ————
D3 5.08 ————
D4 6.25 ————
Note: The tolerance is ±0.127 mm unless otherwise specified.
Figure 7.4 SCSI interface connector (ODD side)