NI DAQMX Channel Attributes Counter Output - ni/grpc-device GitHub Wiki
See how to get and set attributes.
- DAQmx_CO_OutputType
- Pulse
-
General Properties
- Counter Output Timebase
- More
Data Type: | int32 |
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Description: | Indicates how to define pulses generated on the channel. |
Restrictions: | Not Settable |
Valid values
DAQmx_Val_Pulse_Time | 10269 | Generate pulses defined by the time the pulse is at a low state and the time the pulse is at a high state. |
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DAQmx_Val_Pulse_Freq | 10119 | Generate digital pulses defined by frequency and duty cycle. |
DAQmx_Val_Pulse_Ticks | 10268 | Generate digital pulses defined by the number of timebase ticks that the pulse is at a low state and the number of timebase ticks that the pulse is at a high state. |
You can get this attribute using:
DAQmxGetChanAttribute
Data Type: | int32 |
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Description: | Specifies the resting state of the output terminal. |
Valid values
DAQmx_Val_High | 10192 | High state. |
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DAQmx_Val_Low | 10214 | Low state. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | char* |
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Description: | Specifies on which terminal to generate pulses. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | int32 |
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Description: | Specifies the units in which to define high and low pulse time. |
Valid values
DAQmx_Val_Seconds | 10364 | Seconds. |
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You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | float64 |
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Description: | Specifies the amount of time that the pulse is at a high voltage. This value is in the units you specify with DAQmx_CO_Pulse_Time_Units or when you create the channel. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | float64 |
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Description: | Specifies the amount of time that the pulse is at a low voltage. This value is in the units you specify with DAQmx_CO_Pulse_Time_Units or when you create the channel. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | float64 |
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Description: | Specifies in seconds the amount of time to wait before generating the first pulse. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | float64 |
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Description: | Specifies the duty cycle of the pulses. The duty cycle of a signal is the width of the pulse divided by period. NI-DAQmx uses this ratio and the pulse frequency to determine the width of the pulses and the delay between pulses. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | int32 |
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Description: | Specifies the units in which to define pulse frequency. |
Valid values
DAQmx_Val_Hz | 10373 | Hertz. |
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You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | float64 |
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Description: | Specifies the frequency of the pulses to generate. This value is in the units you specify with DAQmx_CO_Pulse_Freq_Units or when you create the channel. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | float64 |
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Description: | Specifies in seconds the amount of time to wait before generating the first pulse. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | uInt32 |
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Description: | Specifies the number of ticks the pulse is high. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | uInt32 |
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Description: | Specifies the number of ticks the pulse is low. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | uInt32 |
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Description: | Specifies the number of ticks to wait before generating the first pulse. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | char* |
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Description: | Specifies the terminal of the timebase to use for the counter. Typically, NI-DAQmx uses one of the internal counter timebases when generating pulses. Use this property to specify an external timebase and produce custom pulse widths that are not possible using the internal timebases. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | float64 |
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Description: | Specifies in Hertz the frequency of the counter timebase. Specifying the rate of a counter timebase allows you to define output pulses in seconds rather than in ticks of the timebase. If you use an external timebase and do not specify the rate, you can define output pulses only in ticks of the timebase. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | int32 |
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Description: | Specifies whether a timebase cycle is from rising edge to rising edge or from falling edge to falling edge. |
Valid values
DAQmx_Val_Rising | 10280 | Rising edge(s). |
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DAQmx_Val_Falling | 10171 | Falling edge(s). |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | bool32 |
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Description: | Specifies whether to apply the pulse width filter to the signal. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | float64 |
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Description: | Specifies in seconds the minimum pulse width the filter recognizes. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | char* |
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Description: | Specifies the input terminal of the signal to use as the timebase of the pulse width filter. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | float64 |
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Description: | Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | bool32 |
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Description: | Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | uInt32 |
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Description: | Indicates the current value of the count register. |
Restrictions: | Not Settable |
You can get this attribute using:
DAQmxGetChanAttribute
Data Type: | int32 |
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Description: | Indicates the current state of the output terminal of the counter. |
Restrictions: | Not Settable |
Valid values
DAQmx_Val_High | 10192 | High state. |
---|---|---|
DAQmx_Val_Low | 10214 | Low state. |
You can get this attribute using:
DAQmxGetChanAttribute
Data Type: | uInt32 |
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Description: | Specifies a number of timebase ticks by which to increase the time spent in the idle state for each successive pulse. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | uInt32 |
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Description: | Specifies the divisor for an external counter timebase. You can divide the counter timebase in order to generate slower signals without causing the count register to roll over. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | bool32 |
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Description: | Indicates if the task completed pulse generation. Use this value for retriggerable pulse generation when you need to determine if the device generated the current pulse. For retriggerable tasks, when you query this property, NI-DAQmx resets it to FALSE. |
Restrictions: | Not Settable |
You can get this attribute using:
DAQmxGetChanAttribute
Data Type: | bool32 |
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Description: | Specifies whether to apply the initial delay to retriggered pulse trains. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | int32 |
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Description: | Specifies constraints to apply when the counter generates pulses. Constraining the counter reduces the device resources required for counter operation. Constraining the counter can also allow additional analog or counter tasks on the device to run concurrently. For continuous counter tasks, NI-DAQmx consumes no device resources when the counter is constrained. For finite counter tasks, resource use increases with the frequency regardless of the constraint mode. However, fixed frequency constraints significantly reduce resource usage, and fixed duty cycle constraint marginally reduces it. |
Valid values
DAQmx_Val_Unconstrained | 14708 | Counter has no restrictions on pulse generation. |
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DAQmx_Val_FixedHighFreq | 14709 | Pulse frequency must be above 7.63 Hz and cannot change while the task runs. In this mode, the duty cycle has 8 bits of resolution. |
DAQmx_Val_FixedLowFreq | 14710 | Pulse frequency must be below 366.21 Hz and cannot change while the task runs. In this mode, the duty cycle has 16 bits of resolution. |
DAQmx_Val_Fixed50PercentDutyCycle | 14711 | Pulse duty cycle must be 50 percent. The frequency can change while the task runs. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | bool32 |
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Description: | Specifies whether to write samples directly to the onboard memory of the device, bypassing the memory buffer. Generally, you cannot update onboard memory directly after you start the task. Onboard memory includes data FIFOs. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | int32 |
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Description: | Specifies the data transfer mode for the device. For buffered operations, use DMA or USB Bulk. For non-buffered operations, use Polled. |
Valid values
DAQmx_Val_DMA | 10054 | Direct Memory Access. Data transfers take place independently from the application. |
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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 |
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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. |
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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 |
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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 |
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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 |
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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: | uInt32 |
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Description: | Specifies the divisor to apply to the signal you connect to the counter source terminal. Pulse generations defined by frequency or time take this setting into account, but pulse generations defined by ticks do not. You should use a prescaler only when you connect an external signal to the counter source terminal and when that signal has a higher frequency than the fastest onboard timebase. |
You can get/set/reset this attribute using:
DAQmxGetChanAttribute
DAQmxSetChanAttribute
DAQmxResetChanAttribute
Data Type: | bool32 |
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Description: | Indicates whether the counter is ready for new continuous pulse train values. |
Restrictions: | Not Settable |
You can get this attribute using:
DAQmxGetChanAttribute