Roland R-8M Owner's Manual page 70

ABOUT
MIDI
MIDI
stands for
Musical Instrument Digital Interface,
and
is
a
worldwide
standard for transmitting
notes,
musical expressions, and oiher
musical data
between electronic
musical instruments.
If
an instrument has
MIDI,
it
can transmit
musical
data to
other instruments regardless
of the
manufacturer or
type.
When
a note
is
played or a pcda!
Is
pressed,
this
information
is
transmitted
as
a
MIDI
message.
1,
How
MIDI
message
is
Transmitted
and
Received
The
following
is
a simple explanation of
how MIDI
message
is
transmitted
and received.
MIDI Connectors
The
following
three
connectors
are
used
to
transmit and receive
MIDI
message. Use
MIDI
cables to
connect
these
connectors as your setup
requires.
MIDI
IN
:
This
connector
receives
data from another MIDI device.
MIDI
OUT
:
This connector transmits
data from the device
itself.
MIDI
THRU
:
This connector retransmits the exact data
that
was
received
at
MIDI
IN.
*Ygu
can use MIDI
THRU
to
connect as
many
MIDI devices as
you
like,
but the
practical
limit is
4
or 5 devices.
If
more
devices are connected, the MIDI
signal
may
become
garbled,
and
the data
may
not
be
correctly received.
MIDI
Channels
MIDI
uses a single
MIDI
cable to
transmit data independently
to
two
or
more
MIDI
devices using
various channels.
A
MIDI
channel
is
similar
to
a television channel.
By
changing
the
channel on a television
set.
you
can
view programs from
many
broadcast
stations.
When
the receiving channel matches
the
transmitting channel, the data of
that
channel will be received.
The
cable
from the antenna
carries television
data
from many
broadcast
stations.
Broadcast
station
A
Broadcast station
6
Broadcast
station
C
Set the
television to
the channel of the
broadcast station
you
v/ish to see.
MIDI
uses sixteen
channels
(I
—
16),
and
when
a
MIDI
device
is
set to
receive the
same
channel
as
transmitted by the transmitting device,
it
will
receive that
message. For
the
connections and
MIDI
channel settings
shown
in the
following diagram, only
sound
module B
will
produce sound
when
the
keyboard
is
played.
MIDI
OUT
Transmit channel
:
J_
_
—.—.—.DO ODD DO
1 1
DDDDDOOOD
O
UJllJ|lJ
°° OOB ""'
'
BOBaBCDOO
<t
Q}
U
LU
Q
o OOD OO OO DOOOODD O
r-T-I—
1
1
MIDI
IN
MIDI
THRU
Receive channel
:
2
y
^
^a,
1 ( 1
^
s
C3
o
aSQESl
3IB3C&fle
'^m B
^
Receive channel
:
1
i
MIDI
IN
o o :^sggs)
a3B3c^cfe'
68