NI TC-01 stops working

[TC_Magic]

I have written some Labview code that take 1 reading every second from the TC-01.

It works on my PC and other PC's abroad but it stops working, on a specific PC after a couple of hours.

The error message is:

     9/14/2016 3:23 PM -201003 DAQmx Read (Analog DBL 1Chan 1Samp).vi:1<append>

          <B>Task Name: </B>_unnamedTask<0>

Error -201003 is

     Device cannot be accessed. Possible causes:

     Device is no longer present in the system  /  Device is not powered  /  

     Device is powered, but was temporarily without power  /  Device is damaged

I have a separate tasks which read a signal from a potentiometer at a sample rate of 720 samples a second.

I have got them to go into 'Device Manager' and make sure that the USB devices don't turn off.

The TC-01 is connected directly to a desktop PC.

I have been looking at the NI site for help but can't find the answer.

I have noticed that you can 'Reset Device', do you think that will help?

I really need to solve this.

Thanks

TimS

[Sam_Sharp]

It is a USB device so I suspect that for some reason, the connection to the device gets lost. Do you try to re-establish the connection to the device if it fails or do you only ever initialise once at the start of your application?

I don't consider USB to be a 'robust' communications standard - someone plugging in another device, or there being lots of bus traffic, could cause devices to drop out.

[RavensFan]

Check the power management options for that PC to see if it is disabling the USB ports after awhile as an energy saving "feature".

[TC_Magic]

Thanks for the quick response.

It is a USB device and at the moment I just report the error but was thinking of trying to re-establish communication.

How would I got about doing that, I am looking at the 'Reset Device' option but it is asking for a device and not a task.

[TC_Magic]

Thanks but I have tried that but it doesn't seem to stop the TC-01 not working after a certain time.

I have even got them to disable the screen saver.

[RavensFan]

Windows Control Panel >> Power Options

[Sam_Sharp]

---

@TC_Magic wrote:

How would I got about doing that, I am looking at the 'Reset Device' option but it is asking for a device and not a task.

---

Just clear the DAQmx task and re-initialise it.

If you use Reset Device, you can get the device from the task by using a 'DAQmx Task' property node. It will return an array containing all of the devices used in the task which you can then reset in a For loop (or index out the first element since it will be the only device in your task).

[TC_Magic]

Thanks.

I will try it and let you know how I get on