Watchdog Class
- Updated2023-02-21
- 4 minute(s) read
Contains properties and methods for configuring and controlling a watchdog timerTask.
Inheritance Hierarchy
SystemObject
SystemMarshalByRefObject
NationalInstruments.DAQmxWatchdog
SystemMarshalByRefObject
NationalInstruments.DAQmxWatchdog
Namespace: NationalInstruments.DAQmx
Assembly: NationalInstruments.DAQmx (in NationalInstruments.DAQmx.dll) Version: 20.7.45.49302
Syntax
public class Watchdog : MarshalByRefObject, IFilteredTypeDescriptor
Public Class Watchdog Inherits MarshalByRefObject Implements IFilteredTypeDescriptor
The Watchdog type exposes the following members.
Properties
| Name | Description | |
|---|---|---|
 | HasExpired | Indicates if the watchdog timer expired. You can read this property only while the task is running. |
| Timeout | Specifies in seconds the amount of time until the watchdog timer expires. A value of -1 means the internal timer never expires. Set this input to -1 if you use an Expiration Trigger to expire the watchdog task. |
Methods
| Name | Description | |
|---|---|---|
 | ClearExpiration | Unlocks the device after the watchdog timer has expired. |
| CreateObjRef | Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject.) |
| Equals | Determines whether the specified object is equal to the current object. (Inherited from Object.) |
 | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
| GetAOExpirationState | Specifies the state to set the analog output physical channels when the watchdog task expires. |
| GetAOExpirationStateType | Specifies the output type of the analog output physical channels when the watchdog task expires. |
| GetCOExpirationState | Specifies the state to set the counter output channel terminal when the watchdog task expires. |
| GetDOExpirationState | Specifies the state to which to set the digital physical channels when the watchdog task expires. You cannot modify the expiration state of dedicated digital input physical channels. |
| GetHashCode | Serves as the default hash function. (Inherited from Object.) |
| GetLifetimeService | Retrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| InitializeLifetimeService | Obtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject.) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| MemberwiseClone(Boolean) | Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject.) |
| ResetTimer | Resets the internal timer to 0. |
| SetAOExpirationState | Specifies the state to set the analog output physical channels when the watchdog task expires. |
| SetAOExpirationStateType | Specifies the output type of the analog output physical channels when the watchdog task expires. |
| SetCOExpirationState | Specifies the state to set the counter output channel terminal when the watchdog task expires. |
| SetDOExpirationState | Specifies the state to which to set the digital physical channels when the watchdog task expires. You cannot modify the expiration state of dedicated digital input physical channels. |
| ToString | Returns a string representation of the object. (Overrides ObjectToString.) |
Remarks
 Tip |
|---|
| Example applications are located in the Public Documents\National Instruments\NI-DAQ\Examples\DotNET4.x directory or in the Start menu at National InstrumentsNI-DAQmxNI-DAQmx Examples. |
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.