=
Data
set
1
*TI'l~'
~IZC
of
Ii'lL' fCQucstro Data
ctoe~
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Indicate- Ii'll.'
number
of
bytes
thai
will
maK!'
UP
a
OTI
me=g~,
bu! I1.'prt"senls
!hr
aoort'5.S fields whel'(' the rwuestC\l data rt'sldeo:-
*5ome models are subject
to
hmltatlons
In
oala
lormal
usN
lor
~
smgle
transaclIon,
Rl'Questt'd aa!a, for example, rna)'
have
a hm!!
'"
leng!h
or
muSI
Dc
IIi-Ildl'd
m!u
proc!(,"!l'rmtnt'd
aaart'S<; fields b('tOI1.' it
IS
l'xchangl.'d acms..,
Ih!'
!Ilterface
*The
same number
of
bytes compnse,
adort'ss
ann
st];1'
dalil
whicl1,
howeyer,
var,'
witn
Ihe
~lodel!D
'"
Tht'
elTOr Ch!.'eking prncess uses
~
chec:ksum
thai
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a
Otl
pal
tern
where
IhC'
leaSI
significant
7
Olts
art' WI'(} WIll'n
values
lor
an
aDdress..
SI%e,
and
that
chec~sum
an'
summeo
DT1
(i
2H)
This message
cOfl"C;SPOnds
to
the
aClual
data
Ir.msfrr
praces,.
Because
every
IWIE
in
tile
aat..a
is
assignee
a UniQue
adl1l1.'so.
~
DT
I mer.sagc
can
conve,.
ltl~
stantn&
ill1are~
of
om'
Uf
more
aala
as
well
a~
s
senes
of
aala
/orma!le)
in an address
dC'ocndem
Ol'ller.
The
.~i1Dl
standard);
inhibit
non·
real
lime
messages
from
Interrupting
an excluSIV('
one.
This
laci
IS
InCOfWenten(
lor
lhe
oevlces
rhat SUPPOr1 a
·soIHhrough*
mechanism,
To
mamtam
compatibility
Wlln
such
(!ey;celo.
Rolafld
haS
IIm'!t'd
Iho;>
DTI
to
256
bYle5
);0
Iha!
an
exce~ively
long
message
is
sen!
OUI
In
se(>3Tlllr segments..
,",YII'
Desc"Olmr,
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~~c'us've
""
M"tluj~ClurM
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s
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of
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capabk
of
proYidmg
ooly
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valla
data
among
1110S1C
specd,~-d
1);.-
an
RQI
message,
..
5umr
models
afl'
suo~r
w lom,tal!ono m data
format
Ur.('d
It)t
II
smilie
Iran;<;aCIIOr..
Rcouested data,
lor
cxamPle,
rna,
/la"r
~
lomll
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lengHl or
mUM
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divitled
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addrt.'S!:
fieills
tejon"
II
IS
e~chanll'ed
across 11'lt' in!1'rjacc
'"
The
IlUmtll:r
of
bYle~
compnsOflIl' adores;;
dala
V3nes
tmm
onr
,\\lJdelllJ
!o
another.
...
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error
chct:kw!:
proces:s uses H chet:Ksum that
pmyilJcs
a
bil
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w/lere
the
leant
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7 bllS
an:
zero
whcn
values
lor
an
adare~
SIZe,
and
lhat
checksum
a",
summC'J.
:;
Example
of
Message
Transactions
•
OC-VICC
A
SCfl{jOflR
data
10
r
.....
Yi~
B
I
Dev,c
..
(A)
I
! Dev>ee
(8)
I
[Dala
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More
ther,
20m
sec
"me
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sel
IJ
[Dan
Sill I J
68
•
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n roQucsung Cilia lrom D('\'ler :\
1)o.>\'IC('
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scnds
an ROI m('s:s.ag('
10
1X'\'ICr
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in!'!'
lhr
m=gl',
[)eViCt A sentls a
DTI
m('s.sagt'
b.ac~
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1)
rD5\~
sell:
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(8)
I
.,
Mor€ Il'lan
20m
sec
lime
,nINna'
rD~la
set
1 J
[Da!~
5e: 1)
a
Handshake
Transfer
Procedure
i
HandshakOflg
I~
an
tnWraCllI'C process Wh('rL'
!WI)
(lcvices
eXChange
error
checkmg
Signals betort' a
messa.'!~
tranoacmm
lakes place,
tnereby
!flcreasing
aal~
reliabill\)'.
l'nhkf
on{'-
.....
ay
transfer
that
mserts
a
paUS('
bel
ween
mer.sagr
lransacllnn"
handSflak~
Lransler allows muCh
spee.:h~r
Iran.r.aC!,"fl' bt'CllU5I.'
oata
transfer
starts
once
t/le
n:;ceiY'ng dcne£.'
returns
II
mao;
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When
it
comes
ID
handling
lal'll~
amoum~
nf
oau;·
samp\rr
waYelorm~
and
synthesrwr
tones
over
1M
emlIT
rang~,
lor
example-across a
MIDl
mwrfacc,
hanasnaklflR
lranskr
IS
mnrt'
efficient
Ihan
one-way
transler,
Types
of
Messages
Message
Comment:!
'0
Went
!O
sent:!
t:!ata
WSD
(40H)
ReoueSl
dala
ROD
(~lH)
Dale
sel
DAT
(~2H)
Acknowleoge
ACK
(43H)
End
oi
oala
~aD
(45H)
Ccmmunicatio",
error
ERR
(.<!EH)
Raj
..
e,;on
R.JC
(4FH)
=
Want
to
send
data:
WSD
(40Hl
ThiS
messag~
i~
senl
CUI
when
dal~
musl
tJ(, scnl
!II
8
dc\',c~
al
Inl'
other
eOd
01
tnl'
mt~rface.
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comams
datil for
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adl1res.s
antl
SIZC
Iha!
specif)
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respectlvei"
01
th!'
dal~
\0
IX' sem.
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rt'mote
de>\'kc
~hec:ks
It~
memory
lor
tnl'
specified data address and
SlZ~
.....
hler, WIll
salisfy
tht' reQuest.
If
it
Ilntls
Ihe>m
and
IS
read}
lor
comrnunlcalloo,
Ihc
d~>VlCe
will
retorn
an - ,\cKnowJ(.'{jgc
(ACK)"
message,
SYle
I
DeSCf!!ll!On
FOH
t;:~clus,ve
Sl11!u;
"H
Mlltlulllc<u.er
ID
(ROland)
DEV
D~v,oe
ID
MDL
Mooel
JD
"H
Commend
'0
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A.dOr"ss
M55
,
I.S8
"H
S,~e
M58
lSa
,"m
Check
wm
F7H
Eod
01
""elusive-
OtherwlSC,
it
will
return
II
-R~JCCllon
(RJC)*
messallc_
>I<
The
s@
of
Ihe !lata
to
be
renl
does
nOI
IIldicaw
the
number
of byles lhal make
up
a "Data
SCI
(DATj* messa!,c, out
represcng
the address fields whel1.'
Ihe
dala
shoute resiae,
>I<
Some
models are sUb.iect
to
limilation5
in
tlalll
lormal
u.;c,:j
lor
a
Sing-Ie
transaction,
ReQueSled
cala,
lor
cxample,
may
haYe a
limit
in
length
or
must IX'
divided
,m()
predelerm'nl:'d
adoms:s
fl~l(ls
Delore it
is
exchang('/j acms.s Il'It' !fIlenaee.
>I<
The
;<;arne
number
of
bytC!l compnses
adamS-$
Md
Slt~
dl\la,
which. hOWeyef,
vary
with
lilt'
ModellD.
"'The
error
checking
oroces<;
use,
a
checksum
Ihal
pmviocs
a bit
paltern
w/lel1.'
(/ll'
leaS'.
Slgniltcant 7 hilS are
lCIU
w/len
Yalue;
tor
an adtlreS£.
SIZe",
al'\d
thai
checksum
are summt(J
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