Honeywell DBC2000 Series Installation Instructions Manual page 8

Note: terminals 18 and 19 are swapped for the Standard and Enhanced/Ultimate models.
This is to prevent that a Standard model can be used by mistake in a system that is wired for an Enhanced or Ultimate model.
Fig. 3-1: Terminal layout
Fig. 3-2: Example of wiring to external equipment (see fig 3-3 for more)
8 ENI7003R8 KO65 2013