nidaqmx.task.co_channel_collection

class nidaqmx._task_modules.co_channel_collection.COChannelCollection(task_handle)[source]

Bases: nidaqmx._task_modules.channel_collection.ChannelCollection

Contains the collection of counter output channels for a DAQmx Task.

add_co_pulse_chan_freq(counter, name_to_assign_to_channel='', units=FrequencyUnits.HZ, idle_state=Level.LOW, initial_delay=0.0, freq=1.0, duty_cycle=0.5)[source]

Creates channel(s) to generate digital pulses that freq and duty_cycle define. The pulses appear on the default output terminal of the counter unless you select a different output terminal.

Parameters

  • counter (str) – Specifies the names of the counters to use to create the virtual channels. The DAQmx physical channel constant lists all physical channels, including counters, for devices installed in the system.

  • name_to_assign_to_channel (Optional[str]) – Specifies a name to assign to the virtual channel this function creates. If you do not specify a value for this input, NI-DAQmx uses the physical channel name as the virtual channel name.

  • units (Optional[nidaqmx.constants.FrequencyUnits]) – Specifies the units in which to define pulse frequency.

  • idle_state (Optional[nidaqmx.constants.Level]) – Specifies the resting state of the output terminal.

  • initial_delay (Optional[float]) – Is the amount of time in seconds to wait before generating the first pulse.

  • freq (Optional[float]) – Specifies at what frequency to generate pulses.

  • duty_cycle (Optional[float]) – Is the width of the pulse divided by the pulse period. NI-DAQmx uses this ratio combined with frequency to determine pulse width and the interval between pulses.

Returns

Indicates the newly created channel object.

Return type

nidaqmx._task_modules.channels.co_channel.COChannel

add_co_pulse_chan_ticks(counter, source_terminal, name_to_assign_to_channel='', idle_state=Level.LOW, initial_delay=0, low_ticks=100, high_ticks=100)[source]

Creates channel(s) to generate digital pulses defined by the number of timebase ticks that the pulse is at a high state and the number of timebase ticks that the pulse is at a low state. The pulses appear on the default output terminal of the counter unless you select a different output terminal.

Parameters

  • counter (str) – Specifies the names of the counters to use to create the virtual channels. The DAQmx physical channel constant lists all physical channels, including counters, for devices installed in the system.

  • source_terminal (str) – Is the terminal to which you connect an external timebase. A DAQmx terminal constant lists all terminals available on devices installed in the system. You also can specify a source terminal by specifying a string that contains a terminal name.

  • name_to_assign_to_channel (Optional[str]) – Specifies a name to assign to the virtual channel this function creates. If you do not specify a value for this input, NI-DAQmx uses the physical channel name as the virtual channel name.

  • idle_state (Optional[nidaqmx.constants.Level]) – Specifies the resting state of the output terminal.

  • initial_delay (Optional[int]) – Is the number of timebase ticks to wait before generating the first pulse.

  • low_ticks (Optional[int]) – Is the number of ticks the pulse is low.

  • high_ticks (Optional[int]) – Is the number of ticks the pulse is high.

Returns

Indicates the newly created channel object.

Return type

nidaqmx._task_modules.channels.co_channel.COChannel

add_co_pulse_chan_time(counter, name_to_assign_to_channel='', units=TimeUnits.SECONDS, idle_state=Level.LOW, initial_delay=0.0, low_time=0.01, high_time=0.01)[source]

Creates channel(s) to generate digital pulses defined by the amount of time the pulse is at a high state and the amount of time the pulse is at a low state. The pulses appear on the default output terminal of the counter unless you select a different output terminal.

Parameters

  • counter (str) – Specifies the names of the counters to use to create the virtual channels. The DAQmx physical channel constant lists all physical channels, including counters, for devices installed in the system.

  • name_to_assign_to_channel (Optional[str]) – Specifies a name to assign to the virtual channel this function creates. If you do not specify a value for this input, NI-DAQmx uses the physical channel name as the virtual channel name.

  • units (Optional[nidaqmx.constants.TimeUnits]) – Specifies the units in which to define pulse high and low time.

  • idle_state (Optional[nidaqmx.constants.Level]) – Specifies the resting state of the output terminal.

  • initial_delay (Optional[float]) – Is the amount of time in seconds to wait before generating the first pulse.

  • low_time (Optional[float]) – Is the amount of time the pulse is low.

  • high_time (Optional[float]) – Is the amount of time the pulse is high.

Returns

Indicates the newly created channel object.

Return type

nidaqmx._task_modules.channels.co_channel.COChannel

property all

nidaqmx._task_modules.channels.channel.Channel: Specifies a channel object that represents the entire list of virtual channels on this channel collection.

property channel_names

Specifies the entire list of virtual channels on this channel collection.

Type

List[str]

count(value) → integer -- return number of occurrences of value
index(value[, start[, stop]]) → integer -- return first index of value.

Raises ValueError if the value is not present.

Supporting start and stop arguments is optional, but recommended.