User manual MATLAB DATA ACQUISITION TOOLBOX QUICK REFERENCE GUIDE

[. . . ] Data Acquisition ToolboxTM Quick Reference Guide Getting Started If you have a sound card installed, you can run the following code, which collects one second of data. ai = analoginput('winsound'); addchannel(ai, 1); set(ai, 'SampleRate', 11025) set(ai, 'SamplesPerTrigger', 11025) start(ai) data = getdata(ai); plot(data) delete(ai) clear ai MATLAB These components are shown below. ® Interactive commands and data Data Acquisition Toolbox M-file functions Data acquisition engine Disk file To list all the toolbox functions and demos, type help daq Hardware driver adaptors To display the command line help for a function, type daqhelp function_name Properties, data, and events Hardware driver Properties, data, and events Sensors Hardware Actuators Toolbox Components The Data Acquisition ToolboxTM components are described below. Component Purpose M-files Create device objects, acquire or output data, configure property values, and evaluate your acquisition status and resources. Store device objects and their property values, control the storage of acquired or queued data, and control the synchronization of events. Pass properties, data, and events between the hardware and the engine. Device Objects Device objects allow you to access specific hardware subsystems. The device objects supported by the toolbox include analog input (AI), analog output (AO), and digital I/O (DIO) objects. Engine Adaptors AI object AO object DIO object Toolbox device objects AI subsystem AO subsystem DIO subsystem Hardware subsystems 1 The Data Acquisition Session A complete data acquisition session consists of five steps: 1 Creating a device object 2 Adding channels or lines to the device object 3 Configuring property values to control the behavior of Adding Channels or Lines Before you can use a device object, you must add at least one channel or line to it. [. . . ] Specify the M-file callback function to execute when a trigger occurs. Specify the channel serving as a trigger source. Specify the condition that must be satisfied before a trigger executes. Specify one or more voltage values that must be satisfied before a trigger executes. Specify the delay value for data logging. Specify the units in which trigger delay data is measured. Specify the number of additional times the trigger executes. Indicate the number of triggers that execute. Specify the type of trigger to execute. 8 Analog Input Status Properties Logging Running SamplesAcquired SamplesAvailable Indicate whether data is being logged to memory or to a disk file. Indicate whether the device object is running. Indicate the number of samples acquired per channel. Indicate the number of samples available per channel in the engine. Analog Input Hardware Configuration Properties ChannelSkew ChannelSkewMode ClockSource InputType SampleRate Specify the time between consecutive scanned hardware channels. Specify how the channel skew is determined. Specify the clock used to govern the hardware conversion rate. Specify the analog input hardware channel configuration. Specify the per-channel rate at which analog data is converted to digital data. Analog Input Callback Properties DataMissedFcn InputOverRangeFcn Specify the M-file callback function to execute when data is missed. Specify the M-file callback function to execute when acquired data exceeds the valid hardware range. Specify the M-file callback function to execute when a run-time error occurs. Specify the M-file callback function to execute every time a predefined number of samples is acquired for each channel group member. Specify the number of samples to acquire for each channel group member before a samples acquired event is generated. Specify the M-file callback function to execute just before the device object starts running. Specify the M-file callback function to execute just after the device object stops running. [. . . ] Specify a descriptive name for the device object. Specify how the value held by the analog output subsystem is determined. Store data that you want to associate with a device object. 12 Channel Properties Analog Output Channel Properties ChannelName DefaultChannel Value HwChannel Index NativeOffset NativeScaling OutputRange Parent Type Units UnitsRange Specify a descriptive channel name. Specify the value held by the analog output subsystem. [. . . ]