NI DAQMX Channel Attributes Digital Output - ni/grpc-device GitHub Wiki
See how to get and set attributes.
- DAQmx_DO_OutputDriveType
- DAQmx_DO_InvertLines
- DAQmx_DO_NumLines
- DAQmx_DO_Tristate
- Line States
- DAQmx_DO_LogicFamily
- Overcurrent
- General Properties
Data Type: | int32 |
---|---|
Description: | Specifies the drive type for digital output channels. |
Valid values
DAQmx_Val_ActiveDrive | 12573 | Drive the output pin to approximately 0 V for logic low and +3.3 V or +5 V, depending on the device, for logic high. |
---|---|---|
DAQmx_Val_OpenCollector | 12574 | Drive the output pin to 0 V for logic low. For logic high, the output driver assumes a high-impedance state and does not drive a voltage. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | bool32 |
---|---|
Description: | Specifies whether to invert the lines in the channel. If you set this property to TRUE, the lines are at high logic when off and at low logic when on. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | uInt32 |
---|---|
Description: | Indicates the number of digital lines in the channel. |
Restrictions: | Not Settable |
You can get this attribute using:
DAQmxGetChanAttribute
Data Type: | bool32 |
---|---|
Description: | Specifies whether to stop driving the channel and set it to a high-impedance state. You must commit the task for this setting to take effect. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | int32 |
---|---|
Description: | Specifies the state of the lines in a digital output task when the task starts. |
Valid values
DAQmx_Val_High | 10192 | Logic high. |
---|---|---|
DAQmx_Val_Low | 10214 | Logic low. |
DAQmx_Val_Tristate | 10310 | High-impedance state. You can select this state only on devices with bidirectional lines. You cannot select this state for dedicated digital output lines. On some devices, you can select this value only for entire ports. |
DAQmx_Val_NoChange | 10160 | Do not change the state of the lines. On some devices, you can select this value only for entire ports. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | int32 |
---|---|
Description: | Specifies the state of the lines in a digital output task when the task pauses. |
Valid values
DAQmx_Val_High | 10192 | Logic high. |
---|---|---|
DAQmx_Val_Low | 10214 | Logic low. |
DAQmx_Val_Tristate | 10310 | High-impedance state. You can select this state only on devices with bidirectional lines. You cannot select this state for dedicated digital output lines. On some devices, you can select this value only for entire ports. |
DAQmx_Val_NoChange | 10160 | Do not change the state of the lines. On some devices, you can select this value only for entire ports. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | int32 |
---|---|
Description: | Specifies the state of the lines in a digital output task when the task completes execution. |
Valid values
DAQmx_Val_High | 10192 | Logic high. |
---|---|---|
DAQmx_Val_Low | 10214 | Logic low. |
DAQmx_Val_Tristate | 10310 | High-impedance state. You can select this state only on devices with bidirectional lines. You cannot select this state for dedicated digital output lines. On some devices, you can select this value only for entire ports. |
DAQmx_Val_NoChange | 10160 | Do not change the state of the lines. On some devices, you can select this value only for entire ports. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | int32 |
---|---|
Description: | Specifies the logic family to use for generation. A logic family corresponds to voltage thresholds that are compatible with a group of voltage standards. Refer to the device documentation for information on the logic high and logic low voltages for these logic families. |
Valid values
DAQmx_Val_2point5V | 14620 | Compatible with 2.5 V CMOS signals. |
---|---|---|
DAQmx_Val_3point3V | 14621 | Compatible with LVTTL signals. |
DAQmx_Val_5V | 14619 | Compatible with TTL and 5 V CMOS signals. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | float64 |
---|---|
Description: | Specifies the current threshold in Amperes for the channel. A value of 0 means the channel observes no limit. Devices can monitor only a finite number of current thresholds simultaneously. If you attempt to monitor additional thresholds, NI-DAQmx returns an error. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | bool32 |
---|---|
Description: | Specifies whether to automatically reenable channels after they no longer exceed the current limit specified by DAQmx_DO_Overcurrent_Limit. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | float64 |
---|---|
Description: | Specifies the delay in seconds between the time a channel no longer exceeds the current limit and the reactivation of that channel, if DAQmx_DO_Overcurrent_AutoReenable is TRUE. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | bool32 |
---|---|
Description: | Specifies whether to write samples directly to the onboard memory of the device, bypassing the memory buffer. Generally, you cannot update onboard memory after you start the task. Onboard memory includes data FIFOs. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | int32 |
---|---|
Description: | Specifies the data transfer mode for the device. |
Valid values
DAQmx_Val_DMA | 10054 | Direct Memory Access. Data transfers take place independently from the application. |
---|---|---|
DAQmx_Val_Interrupts | 10204 | Data transfers take place independently from the application. Using interrupts increases CPU usage because the CPU must service interrupt requests. Typically, you should use interrupts if the device is out of DMA channels. |
DAQmx_Val_ProgrammedIO | 10264 | Data transfers take place when you call an NI-DAQmx Read function or an NI-DAQmx Write function. |
DAQmx_Val_USBbulk | 12590 | Data transfers take place independently from the application using a USB bulk pipe. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | int32 |
---|---|
Description: | Specifies under what condition to transfer data from the buffer to the onboard memory of the device. |
Valid values
DAQmx_Val_OnBrdMemEmpty | 10235 | Transfer data to the device only when there is no data in the onboard memory of the device. |
---|---|---|
DAQmx_Val_OnBrdMemHalfFullOrLess | 10239 | Transfer data to the device any time the onboard memory is less than half full. |
DAQmx_Val_OnBrdMemNotFull | 10242 | Transfer data to the device any time the onboard memory of the device is not full. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | uInt32 |
---|---|
Description: | Specifies the maximum size of a USB transfer request in bytes. Modify this value to affect performance under different combinations of operating system and device. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | uInt32 |
---|---|
Description: | Specifies the maximum number of simultaneous USB transfers used to stream data. Modify this value to affect performance under different combinations of operating system and device. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | bool32 |
---|---|
Description: | Specifies for NI-DAQmx to map hardware registers to the memory space of the application, if possible. Normally, NI-DAQmx maps hardware registers to memory accessible only to the kernel. Mapping the registers to the memory space of the application increases performance. However, if the application accesses the memory space mapped to the registers, it can adversely affect the operation of the device and possibly result in a system crash. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | int32 |
---|---|
Description: | Specifies on which edge of the sample clock to generate samples. |
Valid values
DAQmx_Val_SampClkActiveEdge | 14617 | Active edges. |
---|---|---|
DAQmx_Val_SampClkInactiveEdge | 14618 | Inactive edges. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute