Casio AP-400 - Manual (Page 32)

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17 Individual Parameter Operations
There are two parameter unit operations: Individual Parameter Transfer and Individual Parameter Request.
For one session, in response to an IPR (Individual Parameter Request) from an external device, this Instrument returns an
IPS (Individual Parameter Send) or the session is concluded when the external device or this Instrument spontaneously
sends an IPS. If this Instrument received an IPS, the value of the applicable parameter is changed.
An Individual Parameter Send can also be used to issue some command to the Instrument, and the Individual Parameter
Request can be used to check Instrument status information.
See "Part V Parameter List" for information about how parameters can actually be sent.
Data Receiver Data Sender Operation
IPR → Send Request (Optional)
← IPS Data Transfer