supplied, i s A M P P a r t N u m b e r 1 - 4 8 0270-0,
using A M P
c o n t ac t P a r t N u m b e r 6 0 6 1 9 1-1.
Pin assignments are found in Table 3-2.
T he c h assis s h oul d b e c o n n e cted t o e a r t h
ground to ensure proper operation.
t ime. Drive Select is im pl emented by shortin g
o ne of th e f our c onnections, using a short i n g
p lug. The drive comes equipped from th e f a c-
tory wit h DS1 installed. All ou t p uts are gated
with drive select, as set-up at the factory.
TABLE 3-2
DS1 DS2 DS 3 D S 4 D R IVE SELECT
X
Pin
D . C.
POWER CONN E C T O R
PIN ASSIGNMENT S
Supply Voltage
+24 volts D. C.
24 volts Return
5 volts Return
+5 volts D. C.
Return
X
Selects Drive 0 via
J1-26.
Selects Drive 1 via
J1-28.
Selects Drive 2 via
J1-30.
Selects Drive 3 via
J1-32.
X
HEAD SELECT OPTIONS
(S1 — S3 and 1 B — 4B)
3.6 D R IVE ADDRESS AND
OPTION STRAPPING
The Side Select options allow the user to select
t he heads by va r i ous means. They are i m p l e-
m ented by r e m ov in g t h e s h or t in g p l u g f r o m
the DS1 — DS4 option pads.
The drive address and option strapping is
determined by the different j u m per configura-
t ions r e q u i re d f o r s p e c i fi c s y s te m a p p l i c a -
tions. If j u m p e r c o n f i g u r a t i ons ar e c h anged,
power should be cycled off and on so the micro-
processor can recognize the new configurat i on.
T he d e script io n
o f u s e r - selectable o p t i o n s
should be used in conjunction with Table 3-3.
Throughout Section 3.6, an X denotes jumper
i nstallati on , a n d a das h de n o t e s j u m p e r
removed.
HEAD SELECT USING DRIVE SELECT
DRIVE SELECT (DS1 — DS4)
T o use t h e D r i v e S e l ect l i n e s t o s e l ect t h e
h eads, etch cut S 2 an d i n s t al l S 3 a l ong w i t h
one of the 1B — 4B jumpers. The 1B — 4B con-
trol signal selected may not be th e same con-
trol line used for Drive Select, or an undefined
c ondition r esults. When th e c ont rol l i n e t h a t
c orresponds t o t h e D r i v e S e l ec t j u m p e r i s
driven low (tr u e), the drive is enabled, and the
lower head, Head 0, is selected. When the con-
trol l i n e t h a t c o r r e sponds t o t h e 1 B — 4B
j umper i s
d r i v e n l o w (t r u e ) , t h e d r i v e i s
enabled, an d
t h e u p p e r h e a d , H e a d 1 , i s
selected.
T his option all ows the user to daisy chain u p
to four drives, and to enable one drive at a
3-8
