Data Sender
Data Receiver
Operation
(External Device)
(This Instrument)
SBS(HBS)
----->
Session Start Request
<-----
ACK
Acknowledge
HBS
----->
Send Packet
<-----
ACK
Acknowledge
HBS
----->
Send Packet
<-----
ACK
Acknowledge
HBS
----->
Send Packet
<-----
RJC
Terminate Session
18.3.15
Example: Session Pause
Session flow when the session is temporarily paused for some reason and then restarted is shown below.
A session can be paused by sending an EXI message from an external device or this Instrument to the
other device.
Data Receiver
Data Sender
Operation
(External Device)
(This Instrument)
SBS(HBR)
----->
Session Start
Request
<-----
ACK
Acknowledge
HBR
----->
Send Request
<-----
HBS
Send Packet
ACK
----->
Acknowledge
<-----
HBS
Send Packet
Interval *Note1
EXI
----->
Extend Interval
(Pause Session)
Interval *Note1
EXI
----->
Extend Interval
:
EXI
----->
Extend Interval
Interval *Note1
ACK
----->
Acknowledge
(Restart
Session)*Note2
<-----
HBS
Send Packet
ESS
----->
End of Data
:
Other Sub Session
:
EBS
----->
End of Session
Note1
:
Interval less than the time stipulated by Handshake Max Interval explained under “20.2 System Exclusive Protocol
Parameter”. There is no limit on the number of extensions using EXI.
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