Measurement Computing ADAC-LVi - Manual (Page 150)

Chapter 2 Digital I/O Library
ADAC LabVIEW VI 144
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For detailed definitions see the 5600 manuals ADVANCED
PROGRAMMING TECHNIQUES. When the PortResolution=16,
PatternPolarity, PatternTransition and PatternMask are set in WORDs
b(1111111111111111).
Pattern Mask The PatternPolarity, PatternTransition and PatternMask
define the match condition for the Port Mode Specification AND / OR
modes.
For example on can define a match condition as bit 1, bit 2 and bit 3 all
set = "1" as a valid match (AND mode) by setting the following.
Port Mode Specification = AND
PatternPolarity = (b) 1110
PatternTransition = (b) 0
PatternMask = (b) 1110
Alternately, one can define a match condition as any one or more of bit
1, bit 2 and bit 3 having set = "1" by changing the Port Mode
Specification to OR mode.
PM(n) PT(n) PP(n) Pattern Match Bit Definitions
0 0 0 or 1 Bit Masked Off
0 1 0 or 1 Any Transition
1 0 0 ZERO
1 0 1 ONE
1 1 0 ONE to ZERO Transiton
1 1 1 ZERO to ONE Transition
For detailed definitions see the 5600 manuals ADVANCED
PROGRAMMING TECHNIQUES. When the PortResolution=16,
PatternPolarity, PatternTransition and PatternMask are set in WORDs
b(1111111111111111).
Ignore IP Error The Ignore IP Error setting controls the ADAC-LVi
driver pattern match error condition. A setting of TRUE stops the
generation of an error condition when a match condition occurs while
another match is being serviced, indicating match conditions are
occurring faster than they can be serviced.
Time Constant The Time Constant value sets the time required for a
stable input. Use the following equation to determine the value.
TimeConstant = period(usec) / 2(usec)