Adaptec 3940UW Podręcznik Użytkownika Pobierz pdf (Strona 32)

2-12

AHA-3940U/3940UW/3940UWD User’s Guide

Stock Number: 511041-00, Rev. B Page: 2-12

Print Spec Number: 494569-00

Current Date: 2/14/97 ECN Date: 2/17/97

Terminate the SCSI device at the end of the internal or external SCSI

cable, and disable termination on all other devices on the SCSI bus.

Read the device documentation if you are not sure how to enable or

disable termination on your SCSI devices.

Note:

Some SCSI disk drives allow termination power to be

supplied to their resistor modules from the SCSI bus instead

of from the drive’s power supply. AHA-3940U/3940UW/

3940UWD host adapters support this option, because they

always supply termination power on the SCSI bus.

Terminating the Host Adapter

Termination for Channels A and B is Automatic by default on

AHA-3940U/3940UW/3940UWD host adapters. You can change

this setting, if necessary, with the SCSISelect configuration utility, as

described in Chapter 3, Configuring Your Host Adapter. The following

section assumes that termination remains at Automatic.

Terminating SCSI Channel A on the AHA-3940U/3940UW and Both

Channels on the AHA-3940UWD

These SCSI channels have an external connector and an internal con-

nector, as shown on page 2-2. You can attach SCSI devices to one of

the two connectors or to both connectors. The default termination

setting for the host adapter is Automatic.

The text uses Channel A as an illustration, but this section also

applies to Channel B of the AHA-3940UWD.

■

If you attach SCSI devices to only one of the two Channel A

connectors, as shown in Figure 2-12, host adapter termination

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 81 82

Brak uwag

Adaptec 3940UW Podręcznik Użytkownika Strona 32