Casio AP-400 - Manual (Page 26)

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Receive
Receipt performs the same operation as when the GM System On message is received.
15.2 Instrument-Specific System Exclusive Message
Format
Most Instrument parameters and user data, and some operation commands can be controlled using this message.
For more information, see "Part IV Instrument-Specific System Exclusive Messages".
Message Format: F0H 44H 15H 01H....F7H