LabJack LJM Analog Waveform Channel¶
Available on macOS
Description¶
Analog waveform channel on a LabJack LJM Device.
An analog waveform channel outputs a user-defined analog waveform on an
analog output (i.e. DAC) line. Samples are output at the rate specified
by the device-level parameter analog_waveform_data_interval. All analog
waveform channels are started and stopped simultaneously, via the
LabJack LJM Start Analog Waveform Output and
LabJack LJM Stop Analog Waveform Output actions, respectively.
Signature¶
iochannel/labjack_ljm_analog_waveform
Required Parameters¶
line¶
- Examples:
DAC0dac1
Analog output line name
value¶
- Alias:
data
Variable from which to read output voltage values (i.e. samples). The
values are output at the rate specified by the
device-level parameter
analog_waveform_data_interval.
The output values must be provided as either a list of numbers or as a string containing the bytes of a double-precision floating-point array in native byte order. The latter format can be created, for example, with the tobytes method of a NumPy array.
The output values are read when LabJack LJM Start Analog Waveform Output executes. Therefore, they can be changed at any time during the experiment, with the latest values being read the next time waveform output is started.
Optional Parameters¶
loop¶
- Default:
NO
If YES, the samples provided in value are output repeatedly in a
loop, producing a periodic waveform. Otherwise, the samples are output
only once.
If the waveform does not loop, then once all the samples have been output, the specified line will remain active with the value given by the last sample until analog waveform output is stopped. To make the output go to zero as soon as the waveform ends, provide a value of zero for the last sample.
Placement¶
Allowed at top level: |
No |
|---|---|
Allowed parent: |