Adaptec 1520A - AHA Storage Controller Fast SCSI 10 MBps Guide de l'utilisateur télécharger pdf (Page 38)

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AHA-1510A/20A Series User’s Guide

Stock Number: 510400-00, Rev. C Page: 3-4

Print Spec Number: 491842-00

Current Date: 11/18/94 ECN Date: 11/29/94

Termination for External Devices Only

When only external devices are connected to the host adapter, the

last device on the external chain of devices should be terminated

and the host adapter should be terminated, as shown in Figure 3-3.

Termination for Internal and External Devices

When both internal and external devices are connected to the host

adapter, the last external device and the last internal device should

be terminated, and you should remove the three terminators (i.e., dis-

able termination) on the host adapter, as shown in Figure 3-4.

Caution: If you replace the host adapter terminators,

make sure you maintain correct orientation. The dot

on the upper left corner of the resistor must align

with pin 1 of the socket.

External device

No termination

Host adapter

Terminators

installed

External device

No termination

External device

Termination enabled

Figure 3-3. Connecting External Devices Only

External device

No termination

Host adapter

Terminators removed

Internal device

No termination

Internal device

Termination

enabled

External device

No termination

External device

Termination enabled

Figure 3-4. Connecting Internal and External Devices

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Adaptec 1520A - AHA Storage Controller Fast SCSI 10 MBps Guide de l'utilisateur Page 38