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requested
data
resides.
*
Some
modeis
are subject
to limitations
in
data
format used
for a single
transaction.
Requested
data,
for
example,
may
have
a
limit in
length or
must be
divided
into
predetermined
address
fields
before
it
is
exchanged
across the
interlace.
*
The
same number
of
bytes
comprises address
and
size data,
which, however,
vary with
the
Model
ID.
*
The
error-checking process
uses
a
checksum
(hat
provides
a
bit
pattern
where
the
last
7 bits
are
zero
when
values
for
an
address,
size,
and
that
checksum
are
summed.
•Data
set
1:
DTI
(12H)
"I
he-
message-
<.
ofe-ponds
So
the
a< iu.it
data
transfer
process.
Because
e\e?\ b\u-
m
the
d.-ta
^ aligned
a
unique
address,
a
DTI
message
(.
.tn
convev
the siarting
address
<>\
<>er
m
more
hits
of
data
as
well
as
a
series of
dala formatted
in
an
address-dependent
order.
Tin'
1
MIDI
standards
inhibit
eon
real-time
messages from
interrupting
an
f.\iki>ive
one.
Th;--
fact
is
im
nmrmen!
for
devices
that
support
a
"soft-thru"
function.
To
maintain
lomnahbihk
with
such
devices,
Roland
has
limiled the
1.311
to 2
5b
bvie> -o
(has
an
r\<
e-.Mvel\
long
message
is
sent
ou!
in
separate
'segments'.
Byte
Descnption
FOH
Exclusive Status
41H
Manufacturer
ID
(Roland)
DEV
Device
ID
MDL
Moael
ID
12H
Command
ID
aaH
Aadress
MSB
LSB
ddH
Data
MSB
i
LSB
sum
Check
sum
F7H
End
of
exclusive
*
A DTI
message
is
capable
of
providing only the
valid
data
among
those
specified
by an
RQ1
message.
*
Some
models
are subject
to
limitations
in
data format
used
for
a
single
transaction.
Requested
data, for
example,
may
have
a
limit
in
length or
must be
divided
into
predetermined
address
fields
before
it
is
exchanged
across the
interface.
*
The
number
of
bytes
comprising address
data
varies
from one
Model
ID
to
another.
*
The
error-checking process uses
a
checksum
that
provides
a
bit
pattern
where
the
last
7
bits
are
zero
when
values
for
an
address,
size,
and
that
checksum
are
summed.
•Example
of
Message
Transactions
*
Device
A
sending data
to
Device
B
Transfer of
a
DTI message
is
all
that
takes place.
Device
A
'
More
than
20m
sec
time
interval.
[Data
set
1]
•Device B
requesting data
from Device
A
Device
B sends an
RQ1
message
to
Device
A.
Checking
the
message,
Device
A
sends
a
DTI message
back
to
Device
B.
[Data
set
1]
Device
B
j
[Request
data]
*
More
than
20m
sec
time
interval.
[Data
set
1]
[Data
set
1]
93
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