Qume DataTrak 8 Bedienungsanleitung PDF herunterladen (Seite 14)

PROGRAMMABLE SHUNT

A

16

pin programmable

shunt

is provided

for

seven

most

com-

monly

used trace

cut

options. All

of

these traces are

usually

shorted when shipped from the factory. The shorted and open

functions

of

the pluggable

options

are shown below.

Trace

Function-Normally

Shorted

Function-Open

A

(OS)

= DRIVE SELECT

(OS)

=

OS

AND HEAD

LOAD

B

(OS)

= DRIVE SELECT

(OS)

= DRIVE SELECT

(HL) = HEAD LOAD

X;

(HL)=

OS

(HL) = DRIVE SELECT

OR

IN USE

Z (IN

USE)

=

OS

(IN

USE)

= HEAD

LOAD

OR

IN USE

HL

Stepper Power=

Stepper Power =

DRIVE SELECT always active

R READY

for

multiplex

mode READY

for

radial

mode

I

INDEX

for

multiplex

mode INDEX

for

radial

mode

,...-------

NOTE

---------,

Radial mode

allows

controller

to

check READY and/or INDEX lines on

all drives

without

DRIVE SELECT.

....-------

NOTE

---------,

Multiplex

mode

requires

DRIVE

SELECT

to

check READY and/or

INDEX line on any drive.

DRIVE SELECT OPTIONS

Normally, up

to

four

drives can be addressed in a

daisy

chain

system.

This

option

allows

up

to

eight

drives

to

be multiplexed

together. Four DRIVE SELECT lines are

to

be used

for

ad-

dressing the drive. DRIVE SELECT 1 is used as DRIVE SELECT

enable, DRIVE SELECT 2 (binary

1),

DRIVE SELECT 3 (binary

2)

and DRIVE SELECT 4 (binary

4)

are the address lines. The

logical

drive

assignment

is accomplished by properly jumper-

ing the Traces

D1,

D2, D4,

where

D1

=(binary

1),

D2

=(binary

2)

and

D4

=(binary

4).

The

jumper

pads are arranged

to

appear as

a 3X3 matrix. The three pads in the vertical center

column

must

each be jumpered

to

either the left column

(1)

or the right

column

(0).

The proper jumpers

for

each drive select number

are shown in the table below.

Drive

Drive Select

Input

Jumper

Center Pad to:

Number

1

2

3 4

01

02

04

0 L

H

H H

0

0 0

1 L

L

H

H

1

0 0

2 L

H

L

H

0

1

0

3

L

L

L H

1

1

0

4 L

H

H

L

0

0

1

5 L

L

H

L

1

0

1

6 L

H

L

L

0

1

1

7

L

L

L

L

1

1

1

L = low level, H =high level

HEAD LOAD OPTIONS

Normally, when a drive is selected,

its

head is loaded and

the

stepper is energized.

Option

1.

Allows

a drive

to

be selected

without

loading head

or

enabling stepper. The advantage

of

this

option

is

that

the out-

put

signals

can be monitored

while

head is unloaded, thereby

extending the media life.

Option

2.

Allows

a drive

to

be selected and stepper

to

be en-

abled

without

loading head. An example

of

this

option

is

that

initial

reset

to

Track 00

at

power-on can be performed

without

the READY

condition.

Option

3.

(Radial READY)

allows

a drive

to

be head loaded,

without

selecting drive

or

enabling stepper. The advantage

of

this

option

is

that

the head can be kept loaded on all drives

thereby

eliminating

the head load

time

at

the

disk

copy opera-

tion.

The

following

table

lists

the Head Load

options

and the

required straps.

DRIVE SELECT/HEAD LOAD OPTIONS

Logic

Normal

Option 1

Option 2

Option 3

DRIVE

(05)=

OS

(05)=

OS

(05)=05

(05)=

OS*HL

SELECT

(OS)

HEAD

(HL)=

OS*R

. (HL) = HL*OS*R

(HL)=HL*R

(HL)=

HL*R

LOAD (HL)

Stepper

(SP)

=(HL)

(SP)=(HL)

(SP)

=(05)

(SP)

=

(OS)

Power

(SP)

=OS*R

= HL*OS*R

=05

=OS*HL

Installation

Unplug X Unplug

BV

Unplug A

i

Plug C Unplus HLv

Unplug HL

Plug

OS

Plug

OS

!

Plus C

Plug C

I

1.

Add a 74L85, 4

bit

comparator

in IC

location

1

K.

2.

Jumper

trace DDS, unplug trace DS1-DS4.

3.

Jumper

properly traces

D1,

D2

and

D4.

10

R = READY, ( ) means drive interval logic, *

function

AND logic

1 2 ... 9 10 11 12 13 14 15 16 17 18 19

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