USB devices are changing address afte reboot?

I am wondering if anyone else has noticed USB devices changing their adresses after re-boots.
I had one customer that was using two USB DAQ devices and had repeated problems with starting his application until after I added some code that queried the devices and assigned device ID's as indicated by their type.
I just got off of the phone with another customer who had a similar problem with a USB to serial device showing up as a different device.
So....
1) Has anyone else seen issue of this type?
2) Any ideas or suggestions to make sure the address swapping does not happen?
Thank you!
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Greetings Ben,
The way the devices will behave when plugged in or when the computer restarts will depend on which driver is being used.
DAQmx Base:  DAQmx Base has no memory of previous devices.  Devices will be named dev1, dev2, dev3 as they are enumerated.  The first detected device will become dev1.  For this reason it is possible for the devices to "trade" their names.  
Scenario:
1) Begin with two USB devices.  Use LSDAQ to note the serial numbers of the devices corresponding to dev1 and dev2.
2) Remove dev1. Note that dev2 now becomes dev1.
3) Re-connect the original dev1.  It will now be named dev2 and you have essentially "traded" your device names.
DAQmx:  DAQmx will associate a serial number with a device.  For this reason, the devices should never trade names unless MAX loses association.  This can occur for example if the device is deleted from MAX.
Scenario:
1) Connect one USB device and note the associated name in MAX.
2) Remove the device and note the red "X" in MAX showing the device is not present.
3) Connect a new USB device (different serial number).  The new device will show up under a new device name (dev#, where # is the first unused positive integer) and the orignal device will remain with the X.  If reconnected, the orignal device will assume the old name and the X will disappear.
Have you been experiencing something which differs from the above scenarios?
Regards,
Jennifer O.
Applications Engineer
National Instruments

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