Parity Enable Option; Start/Stop Option; Remote Led Connection; Daisy Chaining - Seagate MEDALIST 1080SL Product Manual

Medalist 1080sl SCSI Product Manual, August 1995
connector only, install a jumper on pins 22 and 24 of the options jumper
block.

2.6.4 Parity enable option

Parity is enabled when a jumper is installed on pins 17 and 18 of the
options jumper block. ST51080N drives are shipped with parity enabled.

2.6.5 Start/stop option

When a jumper is installed on pins 15 and 16 of the options jumper block,
the drive waits for a Start/Stop Unit command from the host before
starting or stopping the spindle motor.

2.6.6 Remote LED connection

Pins 9 and 10, located on the options jumper block, are reserved for a
remote LED. Pin 9 is ground. The options jumper block accepts 2-mm
connectors. You may need to replace the current LED cable-connector
with a 2-mm connector. If you are placing the drive in an array configu-
ration, we recommend the LiteOn (part number LTL-3231A) LED or
equivalent.

2.7 Daisy chaining

The drive can be connected in a daisy chain with a maximum of eight
SCSI devices (including the host) that have single-ended drivers and
receivers. Each SCSI device must be set to a unique SCSI ID number.
SCSI ID 7 is usually used for the host adapter.
All signals are common between all SCSI devices. The SCSI devices at
both ends of the daisy chain must be terminated; the intermediate SCSI
devices should not be terminated.

2.8 Hot-plugging

You can connect and disconnect the I/O and power cables for each SCSI
device in a daisy chain without powering down the system. This is called
hot-plugging. When hot-plugging, the following conditions must be met:
The terminators at either end of the SCSI bus are in place.
The drive you are disconnecting or connecting is not the device
supplying terminator power or terminating resistance to the bus.
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