Datasheet

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Data Express DE75 Wide

SCSI Install Guide

Removable SCSI Wide Drive Enclosure

Receiving Frame Motherboard

Option Pins:

Remote Unit ID Selection – Pins 1-8 of this connector provide

unit SCSI ID selection for the computer system or expansion

chassis. For remote ID selection through an expansion chas-

sis, an appropriate cable must be attached to these pins and

the unit ID must be sent to “0”. The unit ID can be set with

a rotating switch located inside the receiving frame. See

“Selecting the Unit ID Number Below.”

Disable Termination (DT) – A factory-installed jumper on

these pins disables termination. Remove this jumper if the

drive is physically located at the end of a SCSI daisy chain.

Remote Activity LED (RLED) – These pins provide power

for a remote LED device activity indicator (Pin 11=Cathode,

Pin 12 =Anode).

Enable Termination Power To/From SCSI Bus (TPWR) –

This jumper is installed at the factory.

Figure 1: Drive Installation Overview

Typical 2mm Drive ID Pin Conﬁguration

Figure below illustrates a typical SCSI ID select connec-

tion to a drive with 2mm ID select pins. The wires on the

wire harness connect to the positive pin (or signal pins)

on the disk drive. In some cases, the drive manufacturer

will label the signal pins as Pin 1, 3, 5, 7, (instead of 0,

1, 2, 3 as shown in ﬁgure below). Also, in some cases,

the even-numbered Pins 2, 4, 6 are used for Ground.

Attached the ID select cable to the drive using the 2mm

connectors. Align the “ID0” pin with the black wire.

Attach the 1.25mm connector on the other end of the ID

select cable to the 1.25mm connector (J3B) provided on

the signal distribution board, located inside the carrier.

Refer to the manufacturer’s documentation to disable

termination on the drive.

Figure 2: Receiving Frame Motherboard

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Rugged, Reliable, Mobile, Secure TM Data Express DE75 Wide SCSI Install Guide Removable SCSI Wide Drive Enclosure Receiving Frame Motherboard Option Pins: Remote Unit ID Selection – Pins 1-8 of this connector provide unit SCSI ID selection for the computer system or expansion chassis. For remote ID selection through an expansion chassis, an appropriate cable must be attached to these pins and the unit ID must be sent to “0”. The unit ID can be set with a rotating switch located inside the receiving frame.
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Rugged, Reliable, Mobile, Secure TM Limited Product Warranty CRU-DataPort (CRU) warrants the Data Express DE75 to be free of significant defects in material and workmanship for a period of five years from the original date of purchase. CRU’s warranty is nontransferable and is limited to the original purchaser. Limitation of Liability Figure 3: Typical ID Select Connections (2mm Drive Pins) Selecting the Unit ID Number: Use the alignment tool (provided) to select the ID number of the disk drive.