HP 3000 9x9KS Service Manual page 222

REMOTE
Open Drive will operate as a Stand Alone Device. Jumpers should be used to select SCSI ID.
Shorted Drive will operate as a Remote Device. The SCSI ID is set by applying remote logic (low true) to
the Unit Select pin sets.
AUTO SPIN-UP
Open Disabled, drive will not spin up until initiator sends Start Unit Command. (With auto spin-up dis-
abled, the drive will return "not ready" to all commands except REQUEST SENSE, INQUIRY,
RESERVE, RELEASE, and START UNIT until the drive is ready for access.)
Shorted Enabled, the drive will spin-up automatically at power on.
Pinset
1 SCSI Unit Select 0: input, negative true
2 SCSI Unit Select 1: input, negative true
3 SCSI Unit Select 2: input negative true
4 SCSI Unit Select 3: input negative true
5 Reserved, must be open
6 +5Vdc output: may be used to power
external LED (there is a 261 Ohm current
limiting resistor in series with this pin)
8-34 SCSI and I/O
Table 8-15 J2 Option Connector
Table 8-16 J3 Option Connector Pin Definitions
Upper Pin
Table 8-17 J3 U/Sel SCSI Address Settings
SCSI Address U/Sel 3
0 O
1 O
2 O
3 O
4 O
5 O
6 O
7 O
8 S
9 S
10 S
11 S
12 S
13 S
14 S
15 S
O = Open (or false), S = Shorted (or true)
Lower Pin
Open collector output: pulled high if Remote pinset is
shorted; pulled low if Remote pinset is open
Open collector output: pulled high if Remote pinset is
shorted; pulled low if Remote pinset is open
Sync spindle output if Remote is shorted; pulled low if
Remote pinset is open
Activity LED open collector output for external drive
activity LED; pulled low during initialization for
address selection
Ground
Write Protect:
Open: the drive looks at Mode Page Header and
responds accordingly; default = NOT write protected.
Shorted: drive is forced into the Write protect mode.
U/Sel 2 U/Sel 1 U/Sel 0
O O O
O O S
O S O
O S S
S O O
S O S
S S O
S S S
O O O
O O S
O S O
O S S
S O O
S O S
S S 0
S S S