Can I use the DCU with the CBL 2 or LabPro?

YES. The CBL 2 and LabPro interfaces do support digital output, but use a different connector than the original CBL. Because of the difference in digital connectors, we now offer two versions of the DCU, DCU-CBL (for original CBL users) and DCU-BTD (for LabPro/CBL2 users). Also, the LabPro has analog output, which is used by connecting the standard voltage probe to CH4. To use the Analog Output lines of LabPro, you need to have LabPro operating system 6.22 or newer. Details of how to use the analog output lines are in TIL 1821: How do I use the function generator and analog output feature of LabPro? and in the LabPro Technical Reference Manual.