D
3-
-0
4A
D
4-
C
ha
nn
el
A
na
lo
g
In
pu
t
2--14
D3--04AD 4-Channel Analog Input
Most
applications
usually
require
measurements in engineering units,
which provide more meaningful data.
This is accomplished by using the
conversion formula shown.
Units = value in Engineering Units
A = Analog value (0 -- 255)
S = high limit of the Engineering
unit range
Units = (A/256)*S
The following example shows how you
would use the analog data to represent
pressure (PSI) from 0 to 100. This
example assumes the analog value is
110, which is slightly less than half scale.
This should yield approximately 42.9
PSI.
Units = (A/256)*S
Units = (110/256)*100
Units = 42.9
Scaling the Input
Data
