You can use a NI-DAQmx channel property node to read or configure different properties associated with an analog input channel. This property node can be found in the DAQmx - Data Acquisition sub-palette under Measurement I/O palette. Figure 1 indicates the exact location of this property node.
Figure 1. NI-DAQmx Channel Property Node.
You can also find this property node under the DAQmx Constants & Property Nodes sub-palette located under the DAQmx Advanced sub-palette. Figure 2 illustrates this.
Figure 2. DAQmx Constants & Property Node Sub-palette.
Properties for An Analog Input Channel
The NI-DAQmx channel property node categorizes different properties into either general properties or channel specific properties. This is necessary because, for example, properties valid for an analog input voltage channel would not hold valid for an analog input current channel. Figure 3 shows the available properties (and categories of properties) for an analog input channel.
Figure 3. Analog Input Channel Properties.
Examples of Analog Input Channel Properties
Figure 4 illustrates two examples of AI channel properties. Figure 4(a) illustrates the situation in which the DAQmx channel property node is being used to define the channel terminal configuration. The different terminal configurations that are available are Referenced Single Ended (RSE), Non-Referenced Single Ended (NRSE), Differential and Pseudodifferential. Figure 4(b) shows the case where the property node is being used to define the type of the thermocouple connected analog input channel.
Figure 4. Examples of Analog Input Channel Properties.