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vtsSetPWMResistanceHigh

Open topic with navigation CAPL Functions » VT System » vtsSetPWMResistanceHigh

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Function Syntax

long vtsSetPWMResistanceHigh (char Target[], double Resistance);

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Description

Specifies the resistance value of a high signal on PWM output in “Resistance output PWM” mode.

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Parameters

  • Target: Name of the system variable/namespace that will be affected by this function call.
  • Resistance: Resistance value in ohms. Resistance may have values from 1.0 (1 Ω) up to 250000.0 (250 kΩ). This range is only supported by channel 4 of the VT2004 module. The other channels can handle values from 10.0 (10 Ω) up to 150000.0 (150 kΩ). In special cases, Resistance may be set to -1 on each channel to get infinite resistance. Values outside the hardware’s possible range of values are rounded up to the next highest value or the highest or lowest possible value is used.

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Return Values

  • 0: Successful call
  • -1: Call error
  • -2: The namespace on which the command was called does not exist, is not a valid VT System namespace or does not support this command.
  • -3: The specified resistance is not valid
  • -4: The function wasn’t called in the context of the main method of a test module. So it is not possible to wait until the setting will be taken over from the VT System. Otherwise, the call was successful but it is not sure if the settings have been taken over already when the call returns.

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Example

The following example demonstrates how to use the internal resistor decade of a VT2004 channel to simulate a PWM based sensor. On channel Temp_Sensor the resistor is toggled between 100 Ohm and 140 Ohm with a frequency of 20 Hz and a duty cycle of 50%.

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CAPL

SimulateSensorPWMResistance ()
{
   // Choose resistor stimulation and a PWM curve type
   vtsSetStimulationMode("VTS::Temp_Sensor", 3);
   vtsSetCurveType("VTS::Temp_Sensor", 1);

   // Configure low (100Ohm) and high (140Ohm) resistance values
   vtsSetPWMResistanceLow("VTS::Temp_Sensor", 100);
   vtsSetPWMResistanceHigh("VTS::Temp_Sensor", 140);

   // Set the number of repeats to unlimited
   vtsSetPWMRepeats("VTS::Temp_Sensor", 0);

   // Create a PWM signal with frequency 20Hz and DC 50%
   @sysvar::VTS::Temp_Sensor::PWMFreq = 20.0;
   @sysvar::VTS::Temp_Sensor::PWMDC = 50.0;

   // Start the stimulation
   vtsStartStimulation("VTS::Temp_Sensor");
}

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.NET (C#)

public void SimulateSensorPWMResistance()
{
    // Get VTS interface and VT2004 channel
    IVTSystem vts = VTSystem.Instance;
    IVT2004Channel tempSensor = vts.GetChannel("Temp_Sensor") as IVT2004Channel;

    // Choose resistor stimulation and a PWM curve type
    tempSensor.SetStimulationMode(StimulationMode.ResistanceLower, CurveType.PWM);

    // Configure low (100Ohm) and high (140Ohm) resistance values
    tempSensor.PWMResistanceLow.Value = 100.0;
    tempSensor.PWMResistanceHigh.Value = 140.0;

    // Set the number of repeats to unlimited
    tempSensor.PWMRepeats.Value = 0;

    // Start the stimulation
    tempSensor.StartStimulation();

    // Create a PWM signal with frequency 20Hz and DC 50%
    tempSensor.PWMFreq.Value = 20.0;
    tempSensor.PWMDC.Value = 50.0;
}
SetPWMResistanceHigh