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NI DAQMX Scale Configuration
- DAQmxCalculateReversePolyCoeff
- DAQmxCreateLinScale
- DAQmxCreateMapScale
- DAQmxCreatePolynomialScale
- DAQmxCreateTableScale
int32 DAQmxCalculateReversePolyCoeff (float64 forwardCoeffs[], uInt32 numForwardCoeffsIn, float64 minValX, float64 maxValX, int32 numPointsToCompute, int32 reversePolyOrder, float64 reverseCoeffs[]);
Computes a set of coefficients for a polynomial that approximates the inverse of the polynomial with the coefficients you specify with forwardCoeffs. The function generates a table of x versus y values over the range of x. The function then finds a polynomial fit, using the least squares method to compute a polynomial that computes an x given a y.
Input | ||
---|---|---|
Name | Type | Description |
forwardCoeffs | float64 [] | The array of the forward coefficients for the polynomial that computes y given a value of x. Each element of the array corresponds to a term of the equation. For example, if index 3 of the array is 9, the fourth term of the equation is 9x3. |
numForwardCoeffsIn | uInt32 | The number of elements in forwardCoeff. |
minValX | float64 | The minimum value of x for which you use the polynomial. This is the smallest value of x for which the function generates a y value in the table. |
maxValX | float64 | The maximum value of x for which you use the polynomial. This is the largest value of x for which the function generates a y value in the table. |
numPointsToCompute | int32 | The number of points in the table of x versus y values. The function spaces the values evenly between minValX and maxValX. |
reversePolyOrder | int32 | The order of the reverse polynomial to compute. For example, an input of 3 indicates a 3rd order polynomial. An input of -1 indicates to compute a reverse polynomial of the same order as the forward polynomial. |
Output | ||
reverseCoeffs | float64 [] | The array of the reverse coefficients of the polynomial. Each element of the array corresponds to a term of the equation. For example, if index 3 of the array is 9, the fourth term of the equation is 9y3. reverseCoeffs will be one greater than what you passed for reversePolyOrder. If you pass -1 for reversePolyOrder, the array must be the size of forwardCoeffs. Otherwise, the behavior is undefined. |
Name | Type | Description |
---|---|---|
status | int32 | The error code returned by the function in the event of an error or warning. A value of 0 indicates success. A positive value indicates a warning. A negative value indicates an error. |
int32 DAQmxCreateLinScale (const char name[], float64 slope, float64 yIntercept, int32 preScaledUnits, const char scaledUnits[]);
Creates and configures a scale that uses the equation y=mx+b, where x is the prescaled value and y is the scaled value. The equation is identical for input and output. If your equation is in the form x=my+b, you must first solve for y in terms of x.
Input | ||
---|---|---|
Name | Type | Description |
name | const char [] | Identifies the custom scale for later use, such as when you create channels. |
slope | float64 | The slope, m, in the equation. |
yIntercept | float64 | The y-intercept, b, in the equation. |
preScaledUnits | int32 | The units of the values to scale. |
Value | Description | |
---|---|---|
DAQmx_Val_Volts | volts | |
DAQmx_Val_Amps | amperes | |
DAQmx_Val_DegF | degrees Fahrenheit | |
DAQmx_Val_DegC | degrees Celsius | |
DAQmx_Val_DegR | degrees Rankine | |
DAQmx_Val_Kelvins | kelvins | |
DAQmx_Val_Strain | strain | |
DAQmx_Val_Ohms | ohms | |
DAQmx_Val_Hz | hertz | |
DAQmx_Val_Seconds | seconds | |
DAQmx_Val_Meters | meters | |
DAQmx_Val_Inches | inches | |
DAQmx_Val_Degrees | degrees | |
DAQmx_Val_Radians | radians | |
DAQmx_Val_g | G. 1 g is approximately equal to 9.81 m/s2. | |
DAQmx_Val_MetersPerSecondSquared | meters per second per second | |
DAQmx_Val_Newtons | newtons | |
DAQmx_Val_Pounds | pounds | |
DAQmx_Val_KilogramForce | kilograms-force | |
DAQmx_Val_Newtons | newtons | |
DAQmx_Val_Pounds | pounds | |
DAQmx_Val_PoundsPerSquareInch | pounds per square inch | |
DAQmx_Val_Bar | bar | |
DAQmx_Val_Pascals | pascals | |
DAQmx_Val_VoltsPerVolt | volts per volt | |
DAQmx_Val_mVoltsPerVolt | millivolts per volt | |
DAQmx_Val_NewtonMeters | newton meters | |
DAQmx_Val_InchOunces | ounce-inches | |
DAQmx_Val_InchPounds | pound-inches | |
DAQmx_Val_FootPounds | pound-feet | |
DAQmx_Val_Strain | strain | |
DAQmx_Val_FromTEDS | Units defined by TEDS information associated with the channel. |
scaledUnits | const char [] | The units you want to use for the scaled value. You can use an arbitrary value. |
Name | Type | Description |
---|---|---|
status | int32 | The error code returned by the function in the event of an error or warning. A value of 0 indicates success. A positive value indicates a warning. A negative value indicates an error. |
int32 DAQmxCreateMapScale (const char name[], float64 prescaledMin, float64 prescaledMax, float64 scaledMin, float64 scaledMax, int32 preScaledUnits, const char scaledUnits[]);
Creates and configures a scale that scales values proportionally from a range of prescaled values to a range of scaled values.
Input | ||
---|---|---|
Name | Type | Description |
name | const char [] | Identifies the custom scale for later use, such as when you create channels. |
prescaledMin | float64 | The smallest value in the range of prescaled values. NI-DAQmx maps this value to scaledMin. |
prescaledMax | float64 | The largest value in the range of prescaled values. NI-DAQmx maps this value to scaledMax. |
scaledMin | float64 | The smallest value in the range of scaled values. NI-DAQmx maps this value to prescaledMin. Read operations clip samples that are smaller than this value. Write operations generate errors for samples that are smaller than this value. |
scaledMax | float64 | The largest value in the range of scaled values. NI-DAQmx maps this value to prescaledMax. Read operations clip samples that are larger than this value. Write operations generate errors for samples that are larger than this value. |
preScaledUnits | int32 | The units of the values to scale. |
Value | Description | |
---|---|---|
DAQmx_Val_Volts | volts | |
DAQmx_Val_Amps | amperes | |
DAQmx_Val_DegF | degrees Fahrenheit | |
DAQmx_Val_DegC | degrees Celsius | |
DAQmx_Val_DegR | degrees Rankine | |
DAQmx_Val_Kelvins | kelvins | |
DAQmx_Val_Strain | strain | |
DAQmx_Val_Ohms | ohms | |
DAQmx_Val_Hz | hertz | |
DAQmx_Val_Seconds | seconds | |
DAQmx_Val_Meters | meters | |
DAQmx_Val_Inches | inches | |
DAQmx_Val_Degrees | degrees | |
DAQmx_Val_Radians | radians | |
DAQmx_Val_g | G. 1 g is approximately equal to 9.81 m/s2. | |
DAQmx_Val_MetersPerSecondSquared | meters per second per second | |
DAQmx_Val_Newtons | newtons | |
DAQmx_Val_Pounds | pounds | |
DAQmx_Val_KilogramForce | kilograms-force | |
DAQmx_Val_Newtons | newtons | |
DAQmx_Val_Pounds | pounds | |
DAQmx_Val_PoundsPerSquareInch | pounds per square inch | |
DAQmx_Val_Bar | bar | |
DAQmx_Val_Pascals | pascals | |
DAQmx_Val_VoltsPerVolt | volts per volt | |
DAQmx_Val_mVoltsPerVolt | millivolts per volt | |
DAQmx_Val_NewtonMeters | newton meters | |
DAQmx_Val_InchOunces | ounce-inches | |
DAQmx_Val_InchPounds | pound-inches | |
DAQmx_Val_FootPounds | pound-feet | |
DAQmx_Val_Strain | strain | |
DAQmx_Val_FromTEDS | Units defined by TEDS information associated with the channel. |
scaledUnits | const char [] | The units you want to use for the scaled value. You can use an arbitrary value. |
Name | Type | Description |
---|---|---|
status | int32 | The error code returned by the function in the event of an error or warning. A value of 0 indicates success. A positive value indicates a warning. A negative value indicates an error. |
int32 DAQmxCreatePolynomialScale (const char name[], float64 forwardCoeffs[], uInt32 numForwardCoeffsIn, float64 reverseCoeffs[], uInt32 numReverseCoeffsIn, int32 preScaledUnits, const char scaledUnits[]);
Creates and configures a scale that uses an nth order polynomial equation. NI-DAQmx requires both a polynomial to convert prescaled values to scaled values (forward) and a polynomial to convert scaled values to prescaled values (reverse). If you know only one set of coefficients, use DAQmxCalculateReversePolyCoeff to generate the other set.
Input | ||
---|---|---|
Name | Type | Description |
name | const char [] | Identifies the custom scale for later use, such as when you create channels. |
forwardCoeffs | float64 [] | An array of coefficients for the polynomial that converts prescaled values to scaled values. Each element of the array corresponds to a term of the equation. For example, if index 3 of the array is 9, the fourth term of the equation is 9x3. |
numForwardCoeffsIn | uInt32 | The number of elements in forwardCoeff. |
reverseCoeffs | float64 [] | An array of coefficients for the polynomial that converts scaled values to prescaled values. Each element of the array corresponds to a term of the equation. For example, if index 3 of the array is 9, the fourth term of the equation is 9y3. |
numReverseCoeffsIn | uInt32 | The number of elements in reverseCoeff. |
preScaledUnits | int32 | The units of the values to scale. |
Value | Description | |
---|---|---|
DAQmx_Val_Volts | volts | |
DAQmx_Val_Amps | amperes | |
DAQmx_Val_DegF | degrees Fahrenheit | |
DAQmx_Val_DegC | degrees Celsius | |
DAQmx_Val_DegR | degrees Rankine | |
DAQmx_Val_Kelvins | kelvins | |
DAQmx_Val_Strain | strain | |
DAQmx_Val_Ohms | ohms | |
DAQmx_Val_Hz | hertz | |
DAQmx_Val_Seconds | seconds | |
DAQmx_Val_Meters | meters | |
DAQmx_Val_Inches | inches | |
DAQmx_Val_Degrees | degrees | |
DAQmx_Val_Radians | radians | |
DAQmx_Val_g | G. 1 g is approximately equal to 9.81 m/s2. | |
DAQmx_Val_MetersPerSecondSquared | meters per second per second | |
DAQmx_Val_Newtons | newtons | |
DAQmx_Val_Pounds | pounds | |
DAQmx_Val_KilogramForce | kilograms-force | |
DAQmx_Val_Newtons | newtons | |
DAQmx_Val_Pounds | pounds | |
DAQmx_Val_PoundsPerSquareInch | pounds per square inch | |
DAQmx_Val_Bar | bar | |
DAQmx_Val_Pascals | pascals | |
DAQmx_Val_VoltsPerVolt | volts per volt | |
DAQmx_Val_mVoltsPerVolt | millivolts per volt | |
DAQmx_Val_NewtonMeters | newton meters | |
DAQmx_Val_InchOunces | ounce-inches | |
DAQmx_Val_InchPounds | pound-inches | |
DAQmx_Val_FootPounds | pound-feet | |
DAQmx_Val_Strain | strain | |
DAQmx_Val_FromTEDS | Units defined by TEDS information associated with the channel. |
scaledUnits | const char [] | The units you want to use for the scaled value. You can use an arbitrary value. |
Name | Type | Description |
---|---|---|
status | int32 | The error code returned by the function in the event of an error or warning. A value of 0 indicates success. A positive value indicates a warning. A negative value indicates an error. |
int32 DAQmxCreateTableScale (const char name[], float64 prescaledVals[], uInt32 numPrescaledValsIn, float64 scaledVals[], uInt32 numScaledValsIn, int32 preScaledUnits, const char scaledUnits[]);
Creates and configures a scale that maps an array of prescaled values to an array of corresponding scaled values. NI-DAQmx applies linear interpolation to values that fall between the values in the table. Read operations clip scaled samples that are outside the maximum and minimum scaled values found in the table. Write operations generate errors for samples that are outside the minimum and maximum scaled values found in the table.
Input | ||
---|---|---|
Name | Type | Description |
name | const char [] | Identifies the custom scale for later use, such as when you create channels. |
prescaledVals | float64 [] | An array of prescaled values. These values map directly to the values in scaledVals. |
numPrescaledValsIn | uInt32 | The number of elements in prescaledVals. |
scaledVals | float64 [] | An array of scaled values. These values map directly to the values in prescaledVals. |
numScaledValsIn | uInt32 | The number of elements in scaledVals. |
preScaledUnits | int32 | The units of the values to scale. |
Value | Description | |
---|---|---|
DAQmx_Val_Volts | volts | |
DAQmx_Val_Amps | amperes | |
DAQmx_Val_DegF | degrees Fahrenheit | |
DAQmx_Val_DegC | degrees Celsius | |
DAQmx_Val_DegR | degrees Rankine | |
DAQmx_Val_Kelvins | kelvins | |
DAQmx_Val_Strain | strain | |
DAQmx_Val_Ohms | ohms | |
DAQmx_Val_Hz | hertz | |
DAQmx_Val_Seconds | seconds | |
DAQmx_Val_Meters | meters | |
DAQmx_Val_Inches | inches | |
DAQmx_Val_Degrees | degrees | |
DAQmx_Val_Radians | radians | |
DAQmx_Val_g | G. 1 g is approximately equal to 9.81 m/s2. | |
DAQmx_Val_MetersPerSecondSquared | meters per second per second | |
DAQmx_Val_Newtons | newtons | |
DAQmx_Val_Pounds | pounds | |
DAQmx_Val_KilogramForce | kilograms-force | |
DAQmx_Val_Newtons | newtons | |
DAQmx_Val_Pounds | pounds | |
DAQmx_Val_PoundsPerSquareInch | pounds per square inch | |
DAQmx_Val_Bar | bar | |
DAQmx_Val_Pascals | pascals | |
DAQmx_Val_VoltsPerVolt | volts per volt | |
DAQmx_Val_mVoltsPerVolt | millivolts per volt | |
DAQmx_Val_NewtonMeters | newton meters | |
DAQmx_Val_InchOunces | ounce-inches | |
DAQmx_Val_InchPounds | pound-inches | |
DAQmx_Val_FootPounds | pound-feet | |
DAQmx_Val_Strain | strain | |
DAQmx_Val_FromTEDS | Units defined by TEDS information associated with the channel. |
scaledUnits | const char [] | The units you want to use for the scaled value. You can use an arbitrary value. |
Name | Type | Description |
---|---|---|
status | int32 | The error code returned by the function in the event of an error or warning. A value of 0 indicates success. A positive value indicates a warning. A negative value indicates an error. |
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