How to acquire from various AI channels simultaneously with a different range for each one?

[Franchesco]

How to acquire from various AI channels simultaneously with a different range for each one?

In LabView I have found some examples but in C there isn't seem to be any.

[RobertoBozzolo]

One possibility is to create virtual channel in MAX, each with the appropriate range, and then programmatically add the channels to the acquisition task with DAQmxAddGlobalChansToTask

[RobertoBozzolo · Accepted solution]

Or you can add channels one by one with individual instructions: the follwing code compile and runs with no errors on a vitual daq device:

err = DAQmxCreateTask ("", &taskH);
err = DAQmxCreateAIVoltageChan (taskH, "Dev1/ai0", "AI0", DAQmx_Val_Cfg_Default, -5.0, 5.0, DAQmx_Val_Volts, "");
err = DAQmxCreateAIVoltageChan (taskH, "Dev1/ai1", "AI1", DAQmx_Val_Cfg_Default, -10.0, 10.0, DAQmx_Val_Volts, "");
DAQmxStartTask (taskH);
err = DAQmxReadAnalogF64 (taskH, 5, 10.0, DAQmx_Val_GroupByChannel, val, 10, &read, 0);
DAQmxClearTask (taskH);