Tyan Computer B2891 manual M1205 HDD Start-Mode & ID Selection Switch, Case, Motor Spin Func, Tion

M1205 HDD Start-Mode & ID Selection Switch

SW1 & SW2 HDD Start-Mode Selection Switch

Case	SW1	SW2	Motor Spin Func-
	(DLYD_START)	(RMT_START)	tion
1	OFF	OFF	Motor spins up at
			D.C. power on.
2*	ON	OFF	Motor spins up at
			D.C. power on after
			a delay in seconds
			12 times** the value
			of the numeric
			SEL_ID for the SCSI
			device.
3	OFF	ON	Motor spins up only
			when START UNIT
			command is
			received.
4	ON	ON	Reserved. SCSI
			devices not imple-
			menting this option
			shall execute power
			control according to
			the rules of case 3.

Note:

*Case 2 is the default setting.

**This value may be reduced by SCSI device supplies to reflect the wrost-case time duration of peak current drains at the 12 V.D.C or 5 V.D.C source or both during motor spin up. In no case should the delay exceed 12 s.

64 Chapter 3: Replacing Pre-Installed Components