Yamaha DX21 - Manual (Page 45)

Function s only on MSB data:
MSB
00000000
01000000
0 1 1 1 1 1 1 1 Lowest value
Center value
Highest value
4-1-2. Channel Mode Message
Status 1011nnnn
0ccccccc
0vvvvvvv n=channel no.
a) Recived whether MIDI CH INFO is ON or OFF
C=123 V=0 All notes OFF
b) Received only when MIDI CH INFO is ON
C=126
C=127 V=1
V=0 MONO mode ON
POLY mode ON
4-2. SYSTEM INFORMATION
4-2-1. System Real-Time Message
Active sensing
Status 1 1 1 1 1 1 1 0
Sensing begins when this code is received once. If status and data are not received
within 300 milliseconds the MIDI receive buffer will be cleared and the currently
output note will be turned OFF.
4-2-2. System Exclusive Message
( 1 ) parameter Change (swithch mode)
Status
ID no.
Substatus/ch. no.
Parameter group no.
Switch no.
Data
EOX
1 1 1 1 0 0 0 0
01000011
0001nnnn
00001000
0mmmmrnmm
0ddddddd
1 1 1 1 0 1 1 1
n=channel no.
d=0:OFF, 1~127:ON
All panel swithces are controlled. The switch numbers are arranged as shown in
the illustration below. Receiced only when MIDI SYS INFO is ON.
(2) Parameter Change
The format is the same as the transmitted parameter change data. Received only
when MIDI SYS INFO is ON. Permits changing voice and function parameters
while the EDIT mode is active. It is also possible to change modes: PLAY, EDIT,
etc. The parameter no. and data received are shown in voice parameter table 5-2
and function parameter table 5-3.
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