Instructor Notes

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What is QMI?Main Features

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Instructor Note

Advantages of this are that instruments can be grouped in logical groups in separate contexts and there is therefore no need to make one big program that contains all the instruments, tasks and whatever logic or timing is necessary. The programs can that way be made modular, with easy addition or removal of contexts.

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'Hello World'

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Instructor Note

Also a nice info to view now is

PYTHON

qmi.info()

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Controlling an instrument

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Instructor Note

A bit shorter listing of the attributes of the object, you can use

PYTHON

dir(nsg)

but it is not easy to read and has also internal and non-RPC variable and callable methods present.

You can also get “help” of any method present. Try:

PYTHON

help(nsg.get_sample)

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Configuring and logging

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Accessing an instrument remotely

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Create a task and a 'service'

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Instructor Note

Note that we used a with context manager for the starting and stopping of QMI, and for make_instrument. These context managers takes care of the start() and stop() calls for QMI and open() and close() calls of the instrument, so they do not need to be separately called anymore.

TIP: You can use the with context manager also for QMI tasks. You can replace in task_demo.py the task part with:

PYTHON

            with qmi.make_task("demo_task", DemoRpcControlTask, task_runner=CustomRpcControlTaskRunner) as task:
                _logger.info("the task has been started")
                while task.is_running() and not ctx.shutdown_requested():
                    sample = nsg.get_sample()
                    amplitude = nsg.get_amplitude()
                    print(" " * int(40.0 + 0.25 * sample) + "*")
                    if abs(sample) > 10:
                        task.set_amplitude(amplitude * 0.99)
                    else:
                        task.set_amplitude(amplitude * 1.01)

                    time.sleep(0.01)

            _logger.info("the task has been stopped")

Now, the with context manager will take care of starting, stopping and joining the task thread.

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Open-source vs internal code

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Releasing and versioning of QMI code

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