Adaptec AHA-2742T User Manual - Page 38

Terminating the Host Adapter, Terminating Other SCSI Peripheral Devices, Getting Started

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Getting Started Terminating the Host Adapter The factory installed bus terminators on the host adapter are enabled by default. Host adapter termination should be disabled only if you attach SCSI devices to both internal and external connectors, since the host adapter would then be in the middle of the SCSI bus. Enabling or disabling host adapter termination is software selectable only, and is done through your computer's EISA Configuration utility. To disable termination on the host adapter, refer to Chapter 3, Configuring the Host Adapter for instructions. Terminating Other SCSI Peripheral Devices Most SCSI devices use a jumper or a switch located close to their SCSI connector(s). On some SCSI devices, you will have to physically remove resistor module(s). Refer to the manufacturer's documentation for instructions on enabling or disabling SCSI bus termination on your SCSI peripheral device(s). Note Some drives allow for the option of supplying termination power to their resistor modules from the SCSI bus instead of from the drives power supply. This option is acceptable since the AHA-2740 Series of host adapters always supplies termination power on the SCSI bus. Adaptec AHA-2740 Series User's Manual Stock Number: 510381-00 / Rev. C (Page 2-11) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93 2-11

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Terminating the Host Adapter
The factory installed bus terminators on the host adapter are
enabled
by default. Host adapter termination should be
disabled
only if you attach SCSI devices to both internal and external con-
nectors, since the host adapter would then be in the middle of the
SCSI bus.
Enabling or disabling host adapter termination is software
selectable only, and is done through your computer’s EISA
Configuration utility. To disable termination on the host adapter,
refer to Chapter 3,
Configuring the Host Adapter
for instructions.
Terminating Other SCSI Peripheral Devices
Most SCSI devices use a jumper or a switch located close to their
SCSI connector(s). On some SCSI devices, you will have to physi-
cally remove resistor module(s). Refer to the manufacturer’s docu-
mentation for instructions on enabling or disabling SCSI bus
termination on your SCSI peripheral device(s).
Note
Some drives allow for the option of supplying termination
power to their resistor modules from the SCSI bus instead of
from the drives power supply. This option is acceptable since
the AHA-2740 Series of host adapters always supplies termina-
tion power on the SCSI bus.
Adaptec AHA-2740 Series User’s Manual
Stock Number:
510381-00
/
Rev. C
(Page 2-11)
Print Spec Number:
491709-00 Rev C
Current Date:
9/1/93
ECN Date:
9/14/93
Getting Started
2-11