Sends loopback data to the load testing device for closed-loop latency measurement.
This data IO operator must be linked to an appropriate configuration, such as a ConfigureLoadTester, using a shared DeviceName.
Inputs & Outputs
Creates and sends a loopback frame to the load testing device.
A loopback frame consists of the ulong loopback value provided by source
that is prepended to a TransmittedWords-element ushort
array of dummy data. When the frame is received by hardware, the loopback value is subtracted from
the current hub clock count on the load testing device and stored. Therefore, if the loopback
value is that of a previous HubClock from the LoadTesterData with the same DeviceName as this operator, this difference will provide a
hardware-timed measurement of real-time latency. The variably-sized dummy data in the loopback
frame is used for testing the effect of increasing the frame size, and thus the write
communication bandwidth, on real-time latency.
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Properties
| Property | Type | Description |
|---|---|---|
DeviceName
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string |
Gets or sets a unique device name. The device name provides a unique, human-readable identifier that is used to link software elements for configuration, control, and data streaming to hardware. For instance, it can be used to link configuration operators to data IO operators within a workflow. This value is usually not set manually, but is assigned in a MultiDeviceFactory to correspond to a fixed address with a piece of hardware such as a headstage. This address is used for software communication. |