Roland U-20 Owner's Manual page 86

1.
How
MIDI Data
is
Transmitted
and Received
Using "channels",
MIDI
can transmit data
mdependently
to
multiple devices over
a single
cable.
You
may
think
of
MIDI channels
as
being
similar to
television channels.
By
switching channels
on a television
receiver,
you can
receive
many
different broadcasts.
When
the channel
of
the transmitter
matches
the channel
of
the receiver,
the data
of
that
channel
is
received.
Broadcasting
1
Channel
1
Broadcasting
2
Channel 2
Broadcasting
3
Channel
3
Set the receiver
(TV
set)
to the channel
you want
to
watch.
f 1
I
J
C3
1=1
o a
o
,,,
Many
different
T.V.
messages
(e.g.
ch
1,2,
3) are
simultaneously being sent through the
cable
from an
antenna.
Sounds
MIDI
has sixteen channels,
numbered
1
—
16.
When
the
MIDI
channel
of the receiving device
matches
the
MIDI
channel
of
the transmitting device,
the data arriving
on
that
channel
is
received.
MIDI
OUT
Transmit Channel
1
MIDI
IN
Receive
Channel
1
Does not
sound
MIDI
OUT
Transmit Channel 2
Only
Sound
Generator
Module B Sounds
MIDI
IN
Receive
Channel
1
Transmit Channel
2
Sound Generator Module
A Sound
Generator
Module B
MIDI
OUT
MIDI
IN
MID)
THRU
MIDI
IN
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p, ,-i-,-i
1
1
1
r-i-i
1 1
—
]
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r-,
r"i"i
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i
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1
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I
n
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1
III
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III
1
III
1
III
I
III
Receive
Ch
inne!
1
Receive
C
ilhannel
2
84