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Power
The DC power connector is designed to mate with AMP PN 1-480424-0 connector or
equivalent. Pin assignments are shown in figure 2.
SCSI signal connector
The SCSI signal connector is a 50-pin connector, Molex part number 70248 or
equivalent, meeting ANSI/SCSI specifications.
SCSI bus termination power
Termination power is optionally provided for systems that desire it. In order to use
termination power, the user needs to install a jumper between pins D4 and B4 of the
Option block. The jumper only needs to be installed on the last device on the SCSI bus
(ie, The file that is physically closest to the terminator). The 0663-E can source up to
1.5 Amps of current at 5.0 volts (+/- 5%) for termination power.
The drive has no internal SCSI bus terminators. The user is responsible for properly
terminating and powering the SCSI bus in the system.
AMP PN 88-4163-081-1, DATA MATE DM500-06-8, or equivalent external terminator may be
used.
For a single-ended cable, a 50-conductor flat cable or a 25 twisted pair cable can be
used, with a maximum length of 6.0 meters and a stub length not to exceed 0.1 meters.
This file has a maximum internal stub length of 0.072 meters on all SCSI signals
except -RST; the -RST signal has an internal stub length of 0.096 meters. To remain
compliant with ANSI, the SCSI bus cable must not add more than 0.028 meters additional
stub length of all SCSI signals except -RST, and no more than 0.004 meters additional
stub length to -RST
SCSI bus electrical characteristics
Note: The drive incorporates the Western Digital WD33C93B SCSI Interface
Controller and conforms to the ANSI/SCSI Interface standard.
Led pins
The LED pins (D5/B5 on the options block) can be used to drive an external LED. The
LED cathode should be connected to pin B5 of the option block, and the LED anode should
be connected to pin D5 of the option Block.
The 0663-E provides up to 20 mA of drive capability. The SCSI signal connector is a
50-pin connector, Modex PN 70248 or equivalent, meeting ANSI/SCSI specifications. |
