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13
AXB-MIDI MIDI Interface
The following table lists and describes System Real-Time Messages:
The following table lists and describes Channel Mode messages:
System Real-Time Messages
Status (D7---D0) Data Bytes (D7---D0) Description
11111000 • Timing Clock.
• Sent 24 times per quarter note when synchronization is
required.
11111001 • Undefined. (Reserved).
11111010 • Start.
• Start the current sequence playing. (This message will be
followed with Timing Clocks).
11111011 • Continue.
• Continue at the point the sequence was Stopped.
11111100 • Stop.
• Stop the current sequence.
11111101 • Undefined. (Reserved).
11111110 • Active Sensing.
• Use of this message is optional. When initially sent, the
receiver will expect to receive another Active Sensing
message each 300ms (max), or it will be assume that the
connection has been terminated.
• At termination, the receiver will turn Off all voices and return
to normal (non-active sensing) operation.
11111111 • Reset.
• Reset all receivers in the system to power-up status. This
should be used sparingly, preferably under manual control.
• In particular, it should not be sent on power-up.
Channel Mode Messages
Status (D7---D0) Data Bytes (D7---D0) Description
1011nnnn • 0ccccccc
• 0vvvvvvv
• Channel Mode Messages.
• This the same code as the Control Change (above), but
implements Mode control and special message by using
reserved controller numbers 120-127.
• All Sound Off.
When All Sound Off is received all oscillators will turn
Off, and their volume envelopes are set to zero as soon
as possible.
c = 120, v = 0: All Sound Off
• Reset All Controllers.
When Reset All Controllers is received, all controller
values are reset to their default values.
c = 121, v = x: Value must only be zero unless
otherwise allowed in a specific Recommended Practice.
• Local Control.
When Local Control is Off, all devices on a given
channel will respond only to data received over MIDI.
Played data, etc. will be ignored. Local Control On
restores the functions of the normal controllers.
c = 122, v = 0: Local Control Off
c = 122, v = 127: Local Control On