Data Acquisition Toolbox™

TriggerType - Specify type of trigger to execute

Description

TriggerType can be Immediate, Manual, or Software. If TriggerType is Immediate, the trigger occurs immediately after the start function is issued. If TriggerType is Manual, the trigger occurs immediately after the trigger function is issued. If TriggerType is Software, the trigger occurs when the associated trigger condition is satisfied (AI only).

For a given hardware device, additional trigger types might be available. Some trigger types require trigger conditions and trigger condition values. Trigger conditions are specified with the TriggerCondition property, while trigger condition values are specified with the TriggerConditionValue property.

When a trigger occurs for an analog input object, data logging is initiated and the Logging property is automatically set to On. When a trigger occurs for an analog output object, data sending is initiated and the Sending property is automatically set to On.

Characteristics

Usage	AI, AO, Common to all channels
Access	Read/write
Data type	String
Read-only when running	Yes

Values

All Supported Hardware

`{Immediate}`	The trigger executes immediately after `start` is issued. Pretrigger data cannot be captured.
`Manual`	The trigger executes immediately after the `trigger` function is issued.
`Software`	The trigger executes when the associated trigger condition is satisfied. Trigger conditions are given by the `TriggerCondition` property. (AI only).

Measurement Computing

`HwDigital`	The trigger source is an external digital signal (AI only). Pretrigger data cannot be captured.
`HwAnalog`	The trigger source is an external analog signal (AI only).

National Instruments

`HwDigital`	The trigger source is an external digital signal. Pretrigger data cannot be captured.
`HwAnalogChannel`	The trigger source is an external analog signal (AI only).
`HwAnalogPin`	The trigger source is a low-range external analog signal (AI only). Note that `HwAnalogPin` is supported only for Traditional NIDAQ devices. It is not supported for NIDAQmx devices.

For 1200 Series hardware, HwDigital is the only device-specific TriggerType value for analog input subsystems. Analog output subsystems do not support any device-specific TriggerType values.

Note The Traditional NI-DAQ adaptor will be deprecated in a future version of the toolbox. If you create a Data Acquisition Toolbox™ object for Traditional NI-DAQ adaptor beginning in R2008b, you will receive a warning stating that this adaptor will be removed in a future release. See the supported hardware page at www.mathworks.com/products/daq/supportedio.html for more information.