Background
This specification is intended to allow members of ARA to build inter-operable modules.
It is intended to allow the assembly of large layouts running many trains in a prototypical manner.
This is made possible by DCC and the use of DCC is assumed in this specification.
this specification allows maximum flexibility for the module builder.
This specification is heavily based on that of the NMRA British Region for their HO modules. The author of this paper is indebted to them for the work they have done.