Casio AP-500 Implementation Manual page 37

RJC is sent to terminate the session in case ACK cannot be recognized.
Data Receiver
HBR →
← HBS
:
RJC ←
The session can be canceled for any reason by sending an RJC. RJC can be sent by the sending device or the receiving
device. The bulk dump session is terminated immediately upon receipt of an RJC.
Data Receiver
HBR →
← HBS
ACK →
← HBS
:
:
RJC →
Data Receiver
HBR →
ACK →
← HBS
ACK →
← HBS
:
:
← RJC
BSY is returned to the external device when OBS, OBR, HBS, or HBR is sent while the Instrument mode is not suitable
to perform bulk dump, etc. After BSY is received, the external device should wait until the Instrument enters a mode in
which the session is enabled.
Data Receiver
OBR →
← BSY
Data Sender
(Send Canceled)
Data Sender
(Send Canceled)
Data Sender
(Send Canceled)
Data Sender
(Send Canceled)
Operation
Send Request (Optional)
Data Send
Fixed amount of time elapses.
Rejection
Operation
Send Request (Optional)
Data Send
Acknowledge
Data Send
Data Receive Rejected
Operation
Send Request (Optional)
Acknowledge
Data Send
Acknowledge
Data Send
Data Receive Rejected
Operation
Send Request
Busy
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