TYPICAL INTERFACE
CHARACTERISTICS
NOTE
T his i s
a st r a p p a bl e f e a t u r e
w ith th e M o to r Control 3 i n p u t
signal line.
Lines between the controller and the drive
have the following characteristics:
V , T r u e
=
+ 0.4 volt maximum at I
DISK CHANGE
This strappable feature pr ovides a t ru e (l ow l
s ignal t o t h e i n t e r f ace w hen D r i v e S elect i s
activated if t h e d r i v e has gone from a R eady
to a N o t R e a d y c o n d i t io n w h i l e d e selected.
This line is reset on the true-to-false transition
o f Dr iv e S e lect i f t h e d r i v e h a s g o n e t o a
Ready condition.
=
48 milliamperes, maximum
V , F a l s e =
+ 2.4 volts minimum open
microamperes, maximum
collector at I,
=
250
F igure 3 - 1 c o n t a in s t h e e l e c t r i ca l i n t e r f a c e
characteristics. Figure 3-2 contains the control
and data tim ing reauirements.
3.5 D . C. POWER
TWO-SIDED
T his o p t io n i s av a i l a b l e o n l y on M ode l
T M848-2E. Tru e ( l ow ) i n d i c ates t ha t a t w o -
sided diskette is installed.
D. C. power is supplied to the dr iv e t h r ough a
s ix-pin A M P c o n n ector, J2 , m o u n te d o n t h e
c ircuit
b o a r d . T h e mat i n g c o n n e ctor, n o t
+5V
150 OHMS
?4LS14 OR
EQUIVALENT
+ TRUE
+ TRUE
TRANSMISSION
LINE ~
7438 OR
LEQUIVALENT
10 FEET
DRIVER
I RECEIVER
FIGURE 3-1
ELECTRICAL INTERFACE CHARAC T ERISTICS
3-6
