Kevin, Great question! This information can be found in the Serial Hardware and Software for Windows Helpat Serial Hardware and Software for Windows Help >> Troubleshooting and Frequently Asked Questions >> Frequently Asked Questions >> Can I use NI serial hardware with a non-Windows platform?
The boards supported by LabVIEW Real-Time are actually determined by the NI-Serial driver. Currently the only boards supported in LabVIEW Real-Time are the PXI-842x and the ENET Series. Work is being done to add Real-Time support for the PXI-813x series to a future version of the driver.
Doug M Applications Engineer National Instruments For those unfamiliar with NBC's The Office, my icon is NOT a picture of me