How Does The "And" Function Work; How Does The "Not" Function Work - Pittway NOTIFIER AM2020 Troubleshooting Manual

How Does the "AND"
Function Work?
How Does the "NOT"
Function Work?
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The "AND" function operates identically to a logic AND statement. It may be
used in the Control-By-Event equation of an output type device (CMX, XPC, or
XPR modules) or of a reverse-activated zone.
Equation Format: AND(Za Zb)
Example 1: Assume that Zone 201 is a reverse activated zone with the following Control-
By-Event equation:
AND(Z10 Z11 Z12)
This means that Zone 10 AND Zone 11 AND Zone 12 must all be in alarm before Zone
201 will enter an alarm condition. The logic gate equivalent of this equation is shown
below.
Figure 3-6: Logic gate equivalent of a three input AND equation.
The above equation can also be visualized in electrical terms as three normally open
switches in series.
Figure 3-7: Electrical equivalent of a three input AND equation.
The "NOT" function operates identically to a logic NOT statement. It may be
used in the Control-By-Event equation of an output type device (CMX, XPC, or
XPR modules) or of a reverse-activated zone.
Equation Format: NOT(Za)
Example 1: Assume that Zone 208 is a reverse activated zone with the following Control-
By-Event equation:
NOT(Z100)
AM2020/AFP1010 Troubleshooting Guide 50432 Revision A 8/13/97
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These are the zones or devices to be
"ANDED" together. There must be at
least two, but there may be more.
This is the zone or device to be
evaluated and the result "inverted".
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