Midi Implementation - Roland MSQ-700 Service Notes

SEP., 1984
MIDI IMPLEMENTATION
March 30, 1984
1. RECOGNIZED RECEIVE DATA
1.1 Memorized messages when in LOAD mode
Status
Second
Third
1000 nnnn Okkk kkkk Ovvv
VVVV
1001 nnnn Okkk kkkk 0000 0000
1001 nnnn Okkk kkkk Ovvv
VVVV
1010 nnnn Okkk kkkk Ovvv
VVVV
1011 nnnn Occc cccc
Ovvv
VVVV
1100 nnnn Oppp pppp
1101 nnnn 0 vv v
VVV V
1110 nnnn
Ovvv
VVVV
Ovvv
VVVV
1011 nnnn 0111 1010
Ovvv
VVVV
Description
Note OFF *1,2
Note OFF *1
Note ON *1
Polyphonic Key Pressure *3,4
Control Change *3,5
Program Change *3
Channel Pressure *3,4
Pitch Wheel Change *3
Local Control *3
1.2 Recognized only
Status Second Third Description
1011 nnnn 0111 1011 0000 0000 ALL NOTES OFF *6
1011 nnnn 0111 1100 0000 0000 OMNI OFF *7
1011 nnnn 0111 1101 0000 0000 OMNI ON *7
1011 nnnn 0111 1110 0000 0000 MONO ON *7
1011 nnnn 0111 1111 0000 0000 POLY ON *7
1.3 Recognized messages for sync.
Status Description
mi 1000
Timing Clock *8
mi
1010
Start
nil
1011 Continue
nil 1100
Stop
NOTES
: *1 kkkkkkk = 9 thru 120 (real), 0 thru 127 (recognized).
*2 When
in STEP LOAD mode, note OFF velocity is
(memorized as lOOlnnnn, Okkkkkkk, 00000000).
ignored
*3 Memorized when
in REAL TIME LOAD mode.
*4 When AFTER TOUCH switch on the rear panel is ON.
*5
ccccccc = 0 thru 121.
*6
When all notes are not OFF, this unit creats
for all ON notes.
OFF
*7 Recognized as
only an ALL NOTES OFF.
*8 When the CLOCK switch is set to MIDI.
2. TRANSMITTED DATA
2.1 All memorized messages when in PLAY mode.
2.2 All received messages.
2.3 Internally originated messages.
*1
Status Second Third
Description
mi 1000
Timing Clock
nil 1010
Start
nil ion
Continue
nil 1100
Stop
ion
nnnn
0111 1011 0000 0000
ALL NOTES OFF
ion
nnnn
0111 1100
0000 0000 OMNI OFF
ion
nnnn
oni nil 0000 0000
POLY ON
NOTES: *1 When MIX OUT switch is ON.
(In PLAY mode, received Mode Messages are not
transmitted.)
*2 When all notes turn OFF.
*3 On power up or when BUS SELECT switch is set to MID
these MODE MESSAGES are transmitted for all channel
GENERAL PRECAUTIONS ON MIDI CONNECTION
Although all MIDI instruments function to MIDI specification, some precautions must
be taken for satisfactory operation.
This is mainly due to MIDI revision. One of primary procedures to be correctly followed
is setting of "Channel Mode" otherwise MIDI function fails from the beginning. Also
remember that MIDI information is effective only when receiving device can recognize a
given message and has software and hardware that duplicate function defined by the
message.
On power up most Roland products complying with MIDI specification 1.0 default to
OMNI ON, POLY. On the contrary, they transmit OMNI OFF and POLY mode messages
from MIDI OUT jack. The reason is as follows.
Receiving instrument must be reset to OMNI OFF mode when it is to accormodate voice
messages sent over the channel to which it is currently assigned while other voice mes¬
sages are present in other channels. (Example, a system consists of one master and more
than one slave, each assigned to different channel.) However, some instruments are
incapable of changing modes on the front panel and need external OMNI OFF message.
To cure this problem a system including such
ed as below.
instruments as slaves should be configur-
MASTER (1st slave)
SLAVE(s)
capable of producing OMNI OFF
incapable of turning to OMNI OFF
message (or POLY, see NOTES)
1. on panel or other means at desir¬
ed time
2. on power up
mode by itself
In the above combination:
1. Slave must be powered ON before the master is turned ON.
(When the second slave connects to MIDI OUT of the first slave, it is the first to be
turned ON.)
2. Master and Slave(s) must be set in the same channel since mode messages will be
recognized by the slave only when set in the channel to which the slave's receiver has
been assigned.
NOTES:
1. Roland products with preliminary MIDI turn to OMNI OFF upon receiving POLY
mode ON.
2. MSQ-700 sends OMNI OFF and POLY ON messages on power-up in all channels.