usb-6509 task problem

[SimoneMarchettiEDA]

Hi,

I have problem with task. This is my code:

I initialize the task.

try
            {
                for (byte i = minRange; i < maxRange; i++)
                {
                    if (pinInit[i]) {
                        digitalOutputWriteTask[i].Dispose();
                    }
                    using (digitalOutputWriteTask[i] = new Task())
                    {
                        digitalOutputWriteTask[i].DOChannels.CreateChannel(strDevice(i), "", ChannelLineGrouping.OneChannelForEachLine);
                        digitalOutputWriteTask[i].Control(TaskAction.Verify);
                        digitalOutputWriteTask[i].Start();
                        writer[i] = new DigitalSingleChannelWriter(digitalOutputWriteTask[i].Stream); //create writer
                        pinInit[i] = true;
                    }
                }
            }catch (Exception ex){
                Console.Out.WriteLine(ex.Message);
                return false;
            }

I have writeDO method in my class:

public bool writeDO(byte pin, bool state) {
            if (pinInit[pin])
            {
                try
                {
writer[pin].WriteSingleSampleMultiLine(true, arrayToSend(1, state));
                        return true;
                    }
                }
                catch (Exception e)
                {
                    Console.Out.WriteLine(e.Message);
                    return false;
                }

I have Exception "NationalInstruments.DAQmx.DaqException: Task specified is invalid or does not exist.".

What's the problem??

Thanks in advance

[Stfn.fois]

 Hi chino5.

did you already check the device name in MAX? Remember that you need to specify the correct device name to create a new phisical channel. Again, If you want to use a task to acquire or generate signals, the task needs to be created in MAX as well. Task's names in your code must match the ones in MAX.

regards,

Stefano