Session Modes

The session mode specifies the data type (signals or frames), direction (input or output), and how data is transferred between your application and the network.

The mode is an enumeration of the following:

• Signal Input Single-Point : Reads the most recent value received for each signal. This mode typically is used for control or simulation applications, such as Hardware In the Loop (HIL).
• Signal Input Waveform : Using the time when the signal frame is received, resamples the signal data to a waveform with a fixed sample rate. This mode typically is used for synchronizing XNET data with DAQmx analog/digital input channels.
• Signal Input XY : For each frame received, provides its signals as a value/timestamp pair. This is the recommended mode for reading a sequence of all signal values.
• Signal Output Single-Point : Writes signal values for the next frame transmit. This mode typically is used for control or simulation applications, such as Hardware In the Loop (HIL).
• Signal Output Waveform : Using the time when the signal frame is transmitted according to the database, resamples the signal data from a waveform with a fixed sample rate. This mode typically is used for synchronizing XNET data with DAQmx analog/digital output channels.
• Signal Output XY : Provides a sequence of signal values for transmit using each frame's timing as the database specifies. This is the recommended mode for writing a sequence of all signal values.
• Frame Input Stream : Reads all frames received from the network using a single stream. This mode typically is used for analyzing and/or logging all frame traffic in the network.
• Frame Input Queued : Reads data from a dedicated queue per frame. This mode enables your application to read a sequence of data specific to a frame (for example, CAN identifier).
• Frame Input Single-Point : Reads the most recent value received for each frame. This mode typically is used for control or simulation applications that require lower level access to frames (not signals).
• Frame Output Stream : Transmits an arbitrary sequence of frame values using a single stream. The values are not limited to a single frame in the database, but can transmit any frame.
• Frame Output Queued : Provides a sequence of values for a single frame, for transmit using that frame's timing as the database specifies.
• Frame Output Single-Point : Writes frame values for the next transmit. This mode typically is used for control or simulation applications that require lower level access to frames (not signals).
• Conversion : This mode does not use any hardware. It is used to convert data between the signal representation and frame representation.

Note that Ethernet is supported by only two modes, Frame Input Stream and Frame Output Stream.