Qume DataTrak 8 Manual de usuario descargar pdf (Pagina 8)

INDEX POSITIONING

INPUT LINES

There are twelve

(12)

low active

TIL

input lines to DataTrak

Ten

(10)

are standard and two

(2)

are user installable options.

Individual signal line characteristics are described below.

The DataTrak 8 Index Sensor adjustment allows precise posi·

tioning in relation to the read/write head gap.

The dynamic positional difference of the DataTrak 8 is within

± 500 us, which can be checked by using a Qume

disk (P/N

50152-01).

ELECTRICAL INTERFACE

High Level: False

Low Level: True

Impedance:

2.4

to 5.25V

oto 0.4V

150

ohms to

Line

DataTrak 8 has three interface connectors. One connector

(P1/J1) is for data signals. A second connector (P5/J5) inter-

faces the

power +

and +

24V

sources. The third connec-

tor

(PO/JO) interfaces the AC power source. The interface con-

nections are shown on page

SIGNAL INTERFACE

All lines in the signal interface are

TIL

compatible, active

(true) when low.

DataTrak 8 uses the 7438 driver as a line driver and 7414

schmitt

trigger inverter as a line receiver. The input

each

receiver is terminated in 150 ohms to

5V.

DR/VE SELECT

1-4

A low active level on this line enables communication between

the individual drive and the controller.

When two or more (up to

drives are daisy chained, each drive

must have a unique DRIVE SELECT address. The DRIVE

SELECT address is controlled by jumpers

DS1

through

DS4.

When the two pads

jumper

DS1

are connected, the drive will

be activated by an active low signal on the DRIVE SELECT

number one line.

the

two

pads

jumper

DS2

are connected,

the drive will

active when DRIVE SELECT line number

two

low active. The same system applies

jumpers

DS3

and

DS4.

The figure following shows the recommended controllt3r inter-

face circuits.

,..-------

NOTE

------..,

D/RECTION

Only one jumper can

connected

within a single drive. Each drive

within a daisy chain must have a

unique DRIVE SELECT number.

Direction (pin

34)

defines the direction of read/write head

movement when the

STEP

line is pulsed. A low level on this

line causes the Head Position Mechanism

move the

read/write head toward the center

the disk when

STEP

pulsed. With the Direction line at a high level, a pulse on the

STEP

line causes the Head Position Mechanism to move the

read/write head away from the center of the disk. DIRECTION

is changed by the trailing (positive going) portion

the step

pulse (see the timing diagram). The logic state

DIRECTION

can

changed

any time after the trailing (positive going)

edge

the

STEP

pulse, and to within 1 microsecond before

the trailing edge

a following

STEP

pulse. The logic state

DIRECTION cannot

changed during the positive going tran·

sition of

STEP,

or within the preceding 1 microsecond of the

positive going transition

STEP.

A low active level

this line will cause the read/write head to

moved one track. The direction of movement is controlled

the DIRECTION line.

STEP

CONTROLLER I,\I DRIVE 1 S I DRIVE 2 Is I DRIVE 4

I I I I I

II,

L.../'

I I I I

7438

equivalent I I

7414

I :

I I

I I I

TTL

I I

TTL

V I I I I I

n;rl

TId:

:~:

I I I I I

7414

equivalent I I I I I

I I I I I

I 7438 I I 7438 I

7438

I I I I I

Feet Max.

..j

OUTPUT LINES

There are seven

(7)

output lines from the DataTrak

five

(5)

are

standard and two

(2)

are optional. Each line has the following

properties.

High Level: False

2.4

to 5.25V, MAX.

cutoff

current

250uA

Low Level: True 0 to

OAA

MAX. sink 48mA

f-.-

3 ms min.

---1

-~v=-

--.j~

1 I.!S min.

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 18 19

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