checking if a device gets disconnected

[sny]

Assuming multiple devices were opened successfully using ibdev, what would be the best method to check if a device get disconnected or goes offline?   I was thinking of just having a timer that would call FindAllListeners and comparing it with the list of successfully opened devices.  Or would a serial poll be a better solution?  Each device would get serial polled say every second.

[Albert.Geven]

Why are you so serious about someone switching off a device or disconnecting it?

Each second is very short, what are you expecting?

[Roland A.]

Hello sny:

Thank you for contacting National Instruments. Have you tried opening NI-SPY and then doing a scan for instruments in Measurement & Automation. NI-SPY will list all the commands being sent to check which devices are present, you can use those commands if you choose to.