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5.3.2 Each mode setting
(1) Setting terminator power supply
Refer to Table 5.2 for controlling the supply of power from the drive to the SCSI terminator
power source (TERMPOW).
For information on NP model, refer to Figures 5.2 and 5.3.
Table 5.2 Setting SCSI terminator power supply (NP model)
Supply on/off of SCSI terminator power from
HDD
Pin pair 23/24 of CN2
(TRMPOW/TRMPOW)
Supply off Open
Supply on Short (*1)
*1. Set at factory shipment.
For NC model, the function of the terminator power supply setting is not supported.
(2) Motor start mode
Set how to control the starting of the HDD spindle motor according to Table 5.3. This setting
only determines the operation mode when the power supply is turned on or the microcode is
downloaded. In both modes, stopping or restarting the spindle motor can be controlled by
specifying the START/STOP UNIT command.
Table 5.3 Motor start mode setting
NC model (*3) NP model
Start timing of the spindle motor
Pin pair 11/12 of
CN2
(GND/RMSTART)
Pin 38 of CN1
(RMT START)
Pin 78 of CN1
(DYLD START)
Starting of the motor is controlled
with the START/STOP UNIT
command.
Short Open or Short Open
The motor is started immediately
after the power supply is turned on or
after the microcode is downloaded.
Open Open Short (*1)
The motor is started after the elapse
of a delay time that is based on the
SCSI ID. The delay time is provided
immediately after the power supply is
turned on or after the microprogram
is downloaded.
Open Short (*2)
*1. Set at factory shipment.
*2. For NP model, delay starting of spindle motor is supported by the CHANGE DEFINITION
command only.
*3. To set the setting terminals on NC models to short, apply voltage ranging between-0.3 V and 0.8
V to the setting terminals externally. To set the setting terminals on NC models to open, apply
voltage ranging between 2.0 V and 5.5 V to the setting terminals from an external source.
Refer to Subsection 3.1.10 “START/STOP UNIT (1B)” of the SCSI Logical Interface
Specifications for details of the START/STOP UNIT command.
78 C141-E270