Newbie question report code info

[US.Homes.Security@xxxxxxxxx]

Hmm I'm confused, I'm reading a vista 10se manual and am tring to
understand a few things involved  . Reading page 20 . I'm given the
example of {1}{2} for "C". It states refer to  System Communication
section for complete info. Now mind you I probably am just not
comprehending the manual so bear with me please. Page 64 System
Communication- ok  I'm having trouble understanding these pages - I
have a full grasp of the 3 beggining paragraphs  and can decipher  most
of the tables but I'm not seeing an area that states 12=C  are they
referring to page 68  the box "To program system status and restore
report codes "and if o that seems to be an example for  3+1 or 4+1
standard format correct?    well if thats the case and I'm not totally
confused if i were to use Contact ID ---no i must be wrong on the how
to input the report code page in the manual it says nothing concerning
using # and 12 as it does on page 68 .. I could use some help where did
they get the 12=C wheres that table..
thanks signed a little confused. Thanks any help would be much
appreciated.