Hi Peter.
Thanks for your prompt response. I have been investigating this error that you are seeing and have a few questions and suggestions. First, you state that you are using NI-DAQ 8.0. I am assuming that you mean DAQmx 8.0 (since the latest version of Traditional DAQ is 7.4.1). DAQmx 8.0 should work with all of your SCXI modules as long as you are using Windows XP or Windows 2000. Are you using one of these operating systems? One thing that can cause this loss of communication is the entry of your PC to suspended mode. Another thing is the existance and execution of Traditional DAQ tasks on your system at the same time that you are using DAQmx. The 88708 error is reported by the DAQmx resource pool when the resource it was told to reserve isn't present in the driver. This happens when the DAQmx driver is trying to reserve a task in one thread and disable the driver (so it can be used by Traditional DAQ) in another thread. Thus, if you are using Traditional DAQ alongside DAQmx, this is probably the source of the problem. These two explanatiosn seem like the most likely sources of this issue.
Let me know if this helps or if you still need assistance. Please include a screenshot of the error in your next post if you are still experiencing issues along with a description of what your program is designed to do. This information will help me troubleshoot the issue further. Have a great day!
Brian F
Applications Engineering
National Instruments