Sequential prophet 5 - Digital

Pi n 2.
MODULATION
WHEEL
CONTROL
VOLTAGE
INPUT
(M-WH
CV
IN)
This
input
ranges
-
+10V,
with
maximum
modulation
being
applied
at
+10V.
Do
not
apply
a
negative
voltage
to
this
input.
3-5
DIGITAL
NOTE:
For
information
on
programming
this
interface,
see
Section
6.
The
DIGITAL
jack
on
the
back
panel
allows
bidirectional
data
communication
at
up to
625
kilobaud.
The
connector
is
a
'f-pin
Switchcraft
SL-17-4F,
SCI
#3-053. To
mate, use
SL-iiO-i^M,
SCI
//P-053.
The
interface
uses
5-V
TTL levels.
CAUTION:
This
is
not
an
RS-232
interface.
RS-232
voltage
levels
(+/-
12
or +/-15V)
will
most
likely
blow
the
two
input
gates.
Furthermore,
most
RS-232
interfaces
lack
the
speed
required
for
transparent
sequencer-Prophet
communications.
Pin 1.
GROUND
Pin
2,
CLOCK
TO
SYNTH
This
input
sees
pin
2 of
a
7^LS08,
with
a
lOK
pull-up to
+5V.
Maximum
frequency:
625
kHz.
Minimum
clock
frequency
for
"transparent"
real-time
sequencer
operation
depends
on
exact
operations
involved.
Slower
speeds
will
generally
degrade
perfor-
mance
by
causing
the
Prophet
to
wait too
long
for the
sequencer
to
complete
multi-
byte
data
transfers.
50
kHz is
probably as
slow as
anyone
is
likely
to
find
useful.
Pin
3,
DATA
TO
SYNTH
This
input
sees
pin
^f of a
J^tLSOS,
with a
lOK
pull-up to
+5V. Data format
is
discussed
below.
Pin
»,
DATA
FROM
SYNTH
This is a
MOS
output
direct
from
pin
19 of a
Signetics
2661 US
ART.
The driver
Low
output
voltage
(Vql)
is
specified
at
OAV
max.
with
a
2.2
mA
output
current
(Iql)-
The
driver
High
output
voltage
(Vqh)
is
2.4V min.,
specified
at
-WO
uA
(Iqh)-
Digital
Cable
Specifications
The
cabling
used
depends
on
the
distance
desired
between
units, and
upon
the
noise
present in
the
system
environment.
Using
individual
coaxial
cables
for
the
two
data
and
clock
lines
will
work best.
It
is
likely you
could
have
trouble-free
operation
at
20-
ft or
longer.
Three-conductor
coax
will
probably
work up to
10 ft.
At
the
opposite
extreme,
individual
wires
can
be used
for
the
two to
five-foot
range.
The
clock
speed
influences
cable
performance,
since
data
transferred
at
higher speeds
encounters
more
reactance
(hence,
degradation)
in
the
cable.
CMIOOOD
2/82
^"^