command to adjust the temperature of the room. As long as the command starts with the byte F0h, has the manufacturer’s I.D. next, and ends with the byte F7h, any string of bytes can go in between, with the meaning set by the manufacturer.
— Jim Cooper from the introduction to The MIDI System Exclusive Book
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System Exclusive Data Formats
This information details the actual codes used by the device to transmit or recognize
“System Exclusive Messages.” With this information and a computer or the proper programmable MIDI controller, you can access instrument functions and performance parameters that are not covered by MIDI Channel Mode, Channel Voice, System Common, and System Real Time messages. Many of these listings also contain
“Parameter Tables” and “Bit-Maps” that reveal how voice, sequence, parameter
(etc.) data is structured for the unit in question.