Casio LK-270 MIDI Implementation - Page 35
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The packed with the same packet number is resent when a checksum mismatch or incompatible data format error is detected. Data Receiver Data Sender HBR → ← HBS ACK → ← HBS ERR → ← HBS ERR → ← HBS ACK → : : ACK → ← EOD : Other subsessions : ← EOS Session terminates if ERR is detected a number of times. Operation Send Request (Optional) Data Send Acknowledge Data Send 1 Error Data Send 2 (Retry 1) Error Data Send 3 (Retry 2) Acknowledge Acknowledge End of Data End of Session Data Receiver Data Sender HBR → ← HBS ACK → ← HBS (Error generated) ERR → ← HBS (Error generated) ERR → ← HBS (Error generated) ERR → ← HBS (Error generated) RJC → Operation Send Request (Optional) Data Send Acknowledge Data Send Error Data Send (Retry 1) Error Data Send (Retry 2) Error Data Send (Retry 3) Session stopped 35