Phidgets DAQ1301_0 deattaching/reattaching

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arnevv
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Phidgets DAQ1301_0 deattaching/reattaching

Postby arnevv » Fri Nov 16, 2018 8:05 am

I have a project where we use 6x Phidgets DAQ1301_0 to read out 84 buttons.
I connected a 12V 4.2A power supply to detect the inputs.
All 6x Phidgets DAQ1301_0 are connected to 1 VINT hub.
The VINT hub is connected with a powered usb hub.

When some of the buttons is pressed the Phidgets board deattached and reattached.

I cannot find the cause why this is happening.
Is there a limit of DAQ1301_0 that I can attach to 1 VINT hub ?
Or is there not enough USB power available ?

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mparadis
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Re: Phidgets DAQ1301_0 deattaching/reattaching

Postby mparadis » Fri Nov 16, 2018 9:01 am

Is it consistently the same buttons that cause the detaches? If there's a wiring issue that's causing a short from power to ground, it could cause a detach. As you said, it could also be a power issue. If you have a multimeter, you can take the VINT Hub out of its enclosure and measure the voltage between the USB power and USB ground. If it dips below 4 volts when the detach happens, it's almost certainly a power issue.

You can also enable logging, which will often provide a reason for the detach.

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Patrick
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Re: Phidgets DAQ1301_0 deattaching/reattaching

Postby Patrick » Mon Nov 19, 2018 1:00 pm

Is the USB hub and the buttons powered by the same supply? Sounds like USB voltage is being browned out, but this should not happen since the DAQ1301 is isolated.

-Patrick

arnevv
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Re: Phidgets DAQ1301_0 deattaching/reattaching

Postby arnevv » Tue Nov 20, 2018 1:59 am

I use now 2 VINT hubs connected to a PC.
I see no deattaching anymore.


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