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Roland M-GS64

Roland M-GS64
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Roland
Exclusive
Messages
1.
Data
Format
for
Exclusive
Messages
Roland’s
MIDI
implementation
uses
the
following
data
format
for
all
Exclusive
messages
(type
IV):
Byie
Description
POH
Exclusive
Status
ait
Manufacturer
ID
(Roland)
DEV
Device
1D
MDL.
Modet
1D
eM
Command
ID
[BODY]
|
Main
data
F7H
End
of
exclusive
¢MIDI
status:
FOH,
F7H
‘An
Exclusive
message
must
be
flanked
by
a
pair
of
status
codes,
starting
with
a
Manufacturer
[D
immediately
after
FOH
(MIDI
version
1.0).
°
Manufacturer
ID:
41H
The
Manufacturer
ID
identifies
the
manufacturer
of
a
MIDI
instrument
that
sends
an
Exclusive
message.
Value
41H
represents
Roland’s
Manufacturer
ID.
*Device
ID:
DEV
The
Device
[D
contains
a
unique
value
that
identifies
individual
devices
in
the
implementation
of
several
MIDI
instruments.
It is
usually
set
to
DOH-OFH,
a
value
smaller
by
one
than
that
of
a
basic
channel,
but
value
OOH-1FH
may
be
used
for
a
device
with
several
basic
channels,
*Model
ID:
MDL
The
Model
1D
contains
a
value
that
identifies
one
model
from
another.
Different
models,
however,
may
share
an
identical
Model
ID
if
they
handle
similar
data.
The
Model
ID
format
may
contain
00H
in
one
or
more
places
to
provide
an
extended
data
field.
The
following
are
examples
of
valid
Model
IDs,
each
representing
a
unique
model:
O1H
(2H
OSH
OOH,
01H.
OOH,
02H
OOH, 00H,
01M
*Command
ID:
CMD
The
Command
ID
indicates
the
function
of
an
Exclusive
message.
The
Command
ID
format
may
contain
00H
in
one
or
more
places
to
provide
an
extended
data
field.
The
following
are
examples
of
valid
Command
IDs,
each
representing
a
unique
function:
OH
02H.
OBE
OOH,
GLH
OOH,
02H
OOH,
GOH,
01H
«Main
data:
BODY
This
field
contains
a
message
to
be
exchanged
across
an
interface.
The
exact
data
size
and
content
will
vary
with
the
Model
1D
and
Command
ID.
2.
Address-mapped
Data
Transfer
Address
mapping
is
a
technique
for
transferring
messages
conforming
to
the
data
format
given
in
Section
1,
It
assigns
a
series
of
memory-resident
records—-waveform
and
tone
data,
switch
status,
and
parameters,
for
example,
to
specific
locations
in
a
machine-dependent
address
space,
thereby
allowing
access
to
data residing
at
the
address
a
message
specifies.
Address-mapped
data
transfer
is
therefore
independent
of
models
and
data
categories,
This
technique
allows
use
of
two
different
transfer
procedures:
one-way
transfer
and
handshake
transfer.
10
*One-way
transfer
procedure
(See
Section
3
for
details.)
This
procedure
is
suited
to
the
transfer
of
a
small
amount
of
data.
Tt
sends
out
an
Exclusive
message
completely
independent
of
the
receiving
device's
status.
Connection
Diagram
Device
A
Device
B
MIDE
OUT
7
MIDEIN,
MIDLOUT
MIDIIN
Connection
at
point
2
is
essential
for
“Request
data”
procedures.
(See
Section
3)
¢Handshake-transfer
procedure
(This
device
does
not
use
this
procedure)
This
procedure
initiates
a
predetermined
transfer
sequence
(handshaking)
across
the
interface
before data
transfer
takes
place.
Handshaking
ensures
that
reliability
and
transfer
speed
are
high
enough
to
handle
a
large
amount
of
data.
Connection
Diagram
Device
A
Device
B
MIDI
GUT
MIDIIN
MIDEIN
2.
MIDIOUT
Connection
at
points
1
and
2
is
essential.
Notes
on
the
above
procedures
*
There
are
separate
Command
IDs
for
different
transfer
procedures.
*
Devices
A
and
B
cannot
exchange
data
unless
they
use
the
same
transfer
procedure,
share
identical
Device
ID
and
Model
ID,
and
are
ready
for
communication.
3.
One-way
Transfer
Procedure
‘This
procedure
sends
out
data
until
it
has
all
been
sent
and
is
used
when
the
messages
are
so
short
that
answerbacks
need
not
be
checked.
For
longer
messages,
however,
the
receiving
device
must
acquire
each
message
in
time with
the
transfer
sequence,
which
inserts
20
milliseconds
intervals,
Types
of
Messages
|
Message
Command
1D
Request
data
i
|
RQI(11H}
Data
set
1
DTT
2H)
*Request
data
#1:
RQ1
(11H)
This
message
is
sent
out
when
there
is
a
need
to
acquire
data
from
a
device
at
the
other
end
of
the
interface.
It
contains
data
for the
address
and
size
that
specify
designation
and
length,
respectively,
of
data
required.
On
receiving
an
RQI
message,
the
remote
device
checks
its
memory
for
the
data
address
and
size
that
satisfy
the
request.
Ef
it
finds
them
and
is
ready
for
communication,
the
device
will
transmit
a
“Data
set
1
(DT1)”
message,
which
contains
the
requested
data.
Otherwise,
the
device
won't
send
out
anything.
Byte
Description
POH
Exclusive
Status
41H
Manufacturer
1D
(Roland)
DEV
Device
ID
MDL
|
Model
ID
MH
Command
ID
aaHi
Address
MSB
i
1
f
LSB
ssHi
Size
MSB
\
:
i
i
LSB
sum
Check
sum
FH
End
of
exctusive
4

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