Casio PX-700 - Manual (Page 37)

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The same packet is resent when a checksum mismatch or incompatible data structure error is detected.
Data send is canceled when no acknowledgement (ACK) is not received.
The session can be canceled for any reason by sending an HDJ. The HDJ can be sent by the sending device or
the receiving device. The bulk dump session is terminated immediately upon receipt of an HDJ.
Data Receiver Data Sender Operation
HDR → Send Request (Optional)
← HDS Data Send
HDA → Acknowledge
← HDS Data Send
HDA → Acknowledge
:
:
HDA → Acknowledge
← EOD End Of Data
:
Other subsessions
:
← EOS End of session
Data Receiver Data Sender Operation
HDR → Send Request (Optional)
← HDS Data Send
HDA → Acknowledge
← HDS Data Send
HDE → Error
← HDS Data Re-send
:
:
HDE → Error
← EOD End Of Data
:
Other subsessions
:
← EOS End of session
Data Receiver Data Sender Operation
HDR → Send Request (Optional)
← HDS Data Send
HDA → Acknowledge
← HDS Data Send
HDJ → Rejection
(Send Canceled)