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17 Parameter Set Transfer Modes (PX-310)
17.1 Communication Modes
17.1.1 One-way and Handshake
Parameter Sets can be transferred by bulk dump using the message exchange types described below.
• One-way mode Parameter Set send/receive (not used)
• One-way mode Parameter Set send request send/receive (not used)
• Handshake mode Parameter Set send/receive
• Handshake mode Parameter Set send request, receive rejected, error notification send/receive
With the one-way mode, the sending device sends data and ends the session without regard to the response of the
receiving device. This mode is best for one-way transfers from a sequencer or similar device.
Important!
The one-way mode format is defined for possible future use, but it is not used because there is no Parameter Set
category that corresponds to this Instrument.
With the handshake mode, the sending device sends the data and then waits for a response from the receiving
device before advancing to the next session. This is a high-speed mode in which there is no time wasted waiting.
See "VI Parameter Set List" for information about how Parameter Sets are actually allocated.
In order to ensure maximum speed for bulk dumping of Parameter Sets, the data format is different from the data
format used for Individual Parameter Change. Data is transferred as-is, using the Model's memory image.
17.1.2 Session and Subsession
Subsession
One Parameter Set can be transferred per subsession. Subsession transfers one Parameter Set or data that is broken
down into multiple packets for transfer, with EOD (End of data) sent at the end to terminate the send.
Data is broken down into multiple packets when a single Parameter Set is larger than a certain size. The Packet
Number in the packet's index field is used to indicate the sequential position of a packet relative to the other
packets.
Even if Parameter Sets are small, they cannot be grouped together and sent as a single packet. A Parameter Set
delimiter is always treated as a packet delimiter for transfer.
Session
One Parameter Set or multiple Parameter Sets can be transferred by one session. A session can consist of one
subsession or multiple subsessions, with EOS (End of session) sent at the end to terminate the send.
Regardless of whether there is a single Parameter Set or multiple Parameter sets, an actual bulk dump always takes
the form of a session, never a subsession only.
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