Ganz Security ZN1A-B4DMZ56U-1 GXi Series VCA Interface Manual - Page 54
Before Clause, The first presence event from zone 0 occurs before the first presence event from zone 1
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Ganz GXi Series VCA Interface Manual V3.05.31.18 Before Clause The 'before' clause adds the requirement that one of inputs to an 'and' clause must start before another. The input clauses to be constrained are chosen using their clause id which is the number in square brackets at the start of the clause sentence on the web page. The 'before' clause can only be created as an input to an 'and' clause and can only refer to other inputs of the same 'and' clause. The example below shows how the 'before' clause constrains an 'and' clause to only match inputs that occur in the correct order. The first presence event from zone 0 occurs before the first presence event from zone 1, so the logical rule is triggered. The second event from zone 0 occurs after the second event from zone 1, so this time the logical rule does not get triggered. 05-2018-A 53 | P a g e