Figure 19. Terminating Resistor Locations For Nd And Wd Drives - Seagate Elite 9 Product Manual

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Installation manual (40 pages)

Table Of Contents

Table of Contents

11.7.3.3

Notes:

[1] Positive logic enables transmitter (+5V = asserted).

Negative logic enables receivers (0V = asserted).

[2] Negative logic signal (0V = asserted).

[3] Total interface cable length should not exceed 82 feet (25 meters) from

the host to the end of the daisy chain.

[4] You must provide terminators.

Terminator requirements

ST410800N/W drives. Internal disc drive I/O termination consists of active

circuits in permanently mounted IC terminator packs on the main PCB. All

single initiator/single target (non-daisy-chain) applications require you to

terminate the initiator and drive. Daisy-chain configurations require you to

terminate only the units at each end of the daisy chain. Do not terminate any

other peripheral on the chain. All terminators in the daisychain must be ANSI

SCSI-2 Standard's alternative 2 terminators (active terminators).

Note. Remove the Terminator Enable jumper from J4A pins 19 and 20

when terminators are not required.

ST410800ND/WD drives. Differential drives are shipped with terminators

installed in sockets next to the I/O connector on the circuit board. See Figure

19. All single initiator-single target (non-daisy-chain) applications require you

to terminate the initiator and drive. Daisy-chain configurations require you to

terminate only the units at each end of the daisy chain. Do not terminate any

other peripheral on the chain.

Note. Remove the terminators from their sockets when terminators are not

required.

To terminate the drive internally, install terminating resistors (part number

15479501) in these sockets.

ST410800ND

Non-wide I/O

Connector

I/O Terminating

Resistors