Casio CTK-4200 manual 32

Data Receiver		Data Sender	Operation
(External Device)		(This Instrument)
HBR	----->		Send Request
			(Optional)
	<-----	HBS	Data Send
ACK	----->		Acknowledge
	<-----	HBS	Data Send
	(Error generated)
ERR	----->		Error
	<-----	HBS	Data Send (Retry 1)
	(Error generated)
ERR	----->		Error
	<-----	HBS	Data Send (Retry 2)
	(Error generated)
ERR	----->		Error
	<-----	HBS	Data Send (Retry 3)
	(Error generated)
RJC	----->		Session stopped

RJC is sent to terminate the session in case ACK cannot be recognized.

Data Receiver		Data Sender	Operation
(External		(This
Device)		Instrument)
HBR	----->		Send Request
			(Optional)
	<-----	HBS	Data Send
	:
	(Fixed amount of time elapses)
RJC	<-----		Timeout error

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		Data Sender	Operation
(External Device)		(This Instrument)
HBR	----->		Send Request
			(Optional)
	<-----	HBS	Data Send
ACK	----->		Acknowledge
	<-----	HBS	Data Send
	:
	:
	(Terminate operation)
RJC	----->		Data Receive
			Canceled

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