MIDI Interface Data Specification
MIDI instruments contain a receiver and a transmitter, the receiver being optoisolated. It interprets and acts on MIDI commands. The transmitter sends messages in MIDI format via a line driver.
The MIDI data rate is 31.25 Kbaud (±1%) asynchronous. MIDI bytes are 10 bits long, consisting of a start bit, eight data bits and a stop bit.
Status Bytes
Status D0-D7 No. of data bytes Description
Channel voice messages &8n 2 Note Off.
&9n 2 Note On (velocity = 0, note off).
&An 2 Polyphonic Key Pressure (after touch).
&Bn 2 Control Change if data byte 1 in the range 0-121.
&Cn 1 Program Change.
&Dn 1 Channel Pressure (after touch).
&En 2 Pitch Wheel Change.
Channel mode messages &Bn 2 Channel mode message if data byte 1 in the range 122-127.
System messages &F0 any System Exclusive.
&Fs (s=1-7) 0-2 System Common.
&Ft (t=8-15) 0 System Real Time.
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