OPTO 22 PCI-AC51, Руководство пользователя

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CHAPTER 3: SETTING UP AND USING THE SDK
PCI-AC51 User’s Guide
23
23
Scaling Operations
Function
Type
Function Parameter
Type
Parameter Description
long PamuxUtilScaleI2I
long
X1
These interpolation functions are useful for con-
verting between engineering units and raw ana-
log counts. Pamux analog input and output
values range between 0 and FFF hex (4,095
decimal). These values typically correspond to
engineering units, such as pH and psi. For
example, to convert raw counts (from 0 to FFF
hex) to a percentage, use:
float fPercent=PamuxUtilScaleI2F
(0,0xFFF,0.0,100.0,RawCount);
long
X2
long
Y1
long
Y2
long
Xin
float PamuxUtilScaleI2F
long
X1
long
X2
float
Y1
float
Y2
long
Xin
float PamuxUtilScaleF2F
float
X1
float
X2
float
Y1
float
Y2
float
Xin
long PamuxUtilScaleF2I
float
X1
float
X2
long
Y1
long
Y2
float
Xin
* Note for Visual Basic users: * indicates a “by reference” argument.