Casio CTK6000 User Manual Page 40

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Session “One session” refers to a series of processes that occur for one user operation. One subsession
or multiple subsessions make up a session. The sender sends EBS (End of Bulk Dump Session) to
end a session. Regardless of whether there is a single parameter set or multiple parameter sets being
transferred, a bulk dump always takes the form of a session, never a subsession only.
22.2 One-way Mode Communication Flow
A single session starts when an external device, which wants to start communication for data send/receive
using one-way protocol, sends an SBS (Start of Bulk Dump Session) message to this Instrument, which
is its communication partner. The external device starts a request send using OBR or a data send using
OBS. The sub session ends when one parameter set that needs to be transferred by the data send device
is complete. After the send of all the parameter sets is complete, the external device that started the
communication sends an EBS to inform the Instrument that the session is ended. The transfer messages
of a single parameter set cannot exceed a preset size. To do this, messages are split into multiple packets
that are less than the preset size, and transfer is performed according to a preset interval. The preset
size and preset time are determined in accordance with the parameters described under “24.2 System
Exclusive Protocol Parameter”.
22.2.1 Example: Sending Data from the Instrument to an External Device in Response
to a Request from the External Device
Data Receiver Data Sender Operation
(External Device) (This Instrument)
SBS(OBR) -----> Session Start
Request
Interval 1 *Note1
OBR -----> Send Request (Start
Sub Session)
<----- OBS Send Packet
Interval 2 *Note2
<----- OBS Send Packet
Interval 2 *Note2
<----- OBS Send Packet
:
Send Other Packet
:
<----- ESS End of Data (End
Sub Session)
:
Other Sub Session
:
EBS -----> End of Session
Note1 : Interval 1 is no less than Oneway Min Interval and no more than Oneway Max Interval, which are explained under
“24.2 System Exclusive Protocol Parameter”. If the interval exceeds these values, the partner device will issue a timeout error.
Note2 : Interval 1 is a Oneway Current Interval, which is explained under “24.2 System Exclusive Protocol Parameter”.
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