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.

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Chapter 3: Replacing Pre-Installed Components

Page 72
Image 72
Tyan Computer B2881 manual M1205 HDD Start-Mode & ID Selection Switch, Case, Motor Spin Func, Tion