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For those who have the OBUB-1 or OBUB-2 that pre-date the V2.0 MSS Standard:
The OBUB-1 and OBUB-2 are compatible with the V2.0 MSS Standard, which is tailored to avoid compatibility issues with legacy MSS products developed under the predecessor V1.0 MSS (the original Rail Model Journal article published in 2005).

However, the OBUB-1 and OBUB-2 don't support some new features of the V2.0 MSS Standard, including "Approach Diverging" aspects associated with junctions (this feature uses MSS Occupancy Bus pin 8, which is no longer assigned as MSS Ground) and "alternate functions" (this feature can use pin 7, which was historically tied to MSS Ground and is still the default use for pin 7 in the V2.0 MSS Standard).

There is no easy way to modify the OBUB-1 or OBUB-2 to support these new features. Upgrading to the OBUB-3 is one path forward to enable use of the Approach Diverging feature or pin 7 for functions other than MSS Ground.

Another change in the V2.0 MSS Standard is that 12VDC is specified for powering all MSS electronics. Some OBUB-2's have a 9VDC regulator installed. There is no harm in leaving such OBUBs as-is; however, to update to 12VDC simply replace the VR1 component with Digi-Key LM2940CT-12/NOPB-ND or an equivalent device.
OBUB Instructions Archive
OBUB-3 Instructions
updated 5/22/2016
OBUB-1 Instructions
OBUB-2 Instructions