K8055: How to detect IO errors or device disconnect?

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1

Hi from a new K8055 user. Great device and I see there is great customer service available here too.

I’ve been playing with this thing for a couple of days now under FreeBSD, and it is fun. I had no problem connecting it to my home proximity alert system. It can monitor all the motion detectors around the house and all that. Really cool.

Of course, I had to get my hands dirty trying to do access the K8055 under Windows, using the K8055D.DLL. I was able to figure out the (undocumented) ReadAll() call so I can get all the readings from digital, analog and counters without doing 4 IOs. So much for the simple stuff.

What I cannot figure out is how to detect IO errors or device disconnect. If I just unplug the K8055 from the USB port, all readings go zero. It doesn’t reopen the device when it is reconnected and there doesn’t seem to be a function that checks if communication with the opened device is still happening. Under FreeBSD using libusb, I get at least timeouts when the communication fails. What am I missing?

2

There is no easy way to check if the K8055 is still connected.
If you have the any unused inputs, e.g. the analog input, you may read the input value to check if the card is still working and connected.

3

That would be one thing for J_Holland to add then :smiley:

I’ll suggest it in his thread about recompiling the DLL.

Thanks for the quick answer.