HP C2246 Technical Reference Manual page 154

Terminator Power Source Options
The single-ended drive is shipped with active terminator integrated circuits installed. When
installing multiple drives on the SCSI channel, the terminators must be disabled on all but the
last drive in the chain. When the Terminator Enable jumper is installed, the terminators are
connected to the SCSI connector; when removed, the terminators are disconnected from the
SCSI connector. Refer to Figure E-2 for the Terminator Enable jumper location.
Active terminators should be powered by Terminator voltage (TermPwr) whenever the drive
is connected to an active SCSI bus to avoid exceeding the bus high-state input current
specification. The Terminator Power jumper determines the TermPwr source as listed below.
Refer to Figure E-2 for the Terminator Power jumper location.
Table E-2.
Narrow, Single-Ended: On-Board Terminator Power (TermPwr) Sources
Note; Terminator Enable jwnper
must
be installed to connect the active terminators to the SCSI connector.
• Terminator Enable
=
open
• On-board active terminators disabled. Terminators not connected to SCSI
Connector.
• Terminator Enable
=
shorted
• On-boa.rd active terminators enabled and connected to SCSI bus. TermPwr
source determined by placement of Terminator Power pinset jwnper.
• Tennina.tor Power
=
open
• TennPwr for on-board terminators provided by the drive only. Drive TermPwr is
not connected to SCSI connector pin 26.
• Terminator Power
=
shorted
• TermPwr for on-board terminators provided by the drive, and drive TermPwr is
connected to SCSI connector pin 26.
E-4 Narrow, Single-Ended Drive Configurations