public Measurement(String meterPacket)
{
packet = meterPacket;
if (meterPacket.Length != 9)
{
throw (new ApplicationException("incorrect format input string should be 9 char long"));
}
//todo validate string content where posable (vaild char set ? 0,1,2,3,4,5,6,7,8,9,:,H,<,....)
var displayDigits = meterPacket.Substring(0, 5);
//convert range char to number
range = (0x0f & meterPacket[5]);
SwitchPosition = (SwitchPositions)meterPacket[6];
coupling = (CouplingFlags)(0x0f & meterPacket[7]);
status = (StatusFlags)(0x0f & meterPacket[8]);
var measInfo = new UT804Meter.UnitScaling(SwitchPosition, coupling, status, range);
units = measInfo.units;
if (displayDigits[0] == '<' || displayDigits[0] == '?' || displayDigits[0] == ':')
{
nonNumvalue = displayDigits;
value = 99999;
}
else
{
nonNumvalue = null;
try
{
value = decimal.Parse(displayDigits) * measInfo.valueMuntiplyer;
}
catch (FormatException)
{
throw (new ApplicationException("digits string dosn't contail the correct format"));
}
}
}
public UnitScaling(SwitchPositions switchPosition, CouplingFlags coupling, StatusFlags status, int range)
{
bool negertiveValue = status.HasFlag(StatusFlags.neg);
//todo could add lots of data validation here to check settings match behavior but beyond the scope of intial version
switch (switchPosition)
{
case SwitchPositions.V:
units = "V";
valueMuntiplyer = 1 / (decimal)Math.Pow(10, 5 - range);
if (negertiveValue)
{
valueMuntiplyer *= -1;
}
break;
case SwitchPositions.VAC:
units = "V AC";
valueMuntiplyer = 1 / (decimal)Math.Pow(10, 5 - range);
break;
case SwitchPositions.mV:
units = "mV";
valueMuntiplyer = 0.01M;
if (negertiveValue)
{
valueMuntiplyer *= -1;
}
break;
case SwitchPositions.Ohms:
switch (range)
{
case 1:
units = "Ohms";
valueMuntiplyer = 0.01M;
break;
case 2:
units = "KOhms";
valueMuntiplyer = 0.0001M;
break;
case 3:
units = "KOhms";
valueMuntiplyer = 0.001M;
break;
case 4:
units = "KOhms";
valueMuntiplyer = 0.01M;
break;
case 5:
units = "MOhms";
valueMuntiplyer = 0.0001M;
break;
case 6:
units = "MOhms";
valueMuntiplyer = 0.001M;
break;
case 7:
units = "MOhms";
valueMuntiplyer = 0.01M;
break;
}
break;
case SwitchPositions.F:
//meter doen't like this mode stops outputing values to RS232 not sure why
units = "F";
//todo
break;
case SwitchPositions.degC:
units = "°C";
valueMuntiplyer = 0.1M;
if (negertiveValue)
{
valueMuntiplyer *= -1;
}
break;
case SwitchPositions.uA:
units = "uA";
valueMuntiplyer = 1 / (decimal)Math.Pow(10, 2 - range);
if (negertiveValue & !coupling.HasFlag(CouplingFlags.AC))
{
valueMuntiplyer *= -1;
}
break;
case SwitchPositions.mA:
units = "mA";
valueMuntiplyer = 1 / (decimal)Math.Pow(10, 3 - range);
if (negertiveValue & !coupling.HasFlag(CouplingFlags.AC))
{
valueMuntiplyer *= -1;
}
break;
case SwitchPositions.A:
units = "A";
valueMuntiplyer = 0.001M;
if (negertiveValue)
{
valueMuntiplyer *= -1;
}
break;
case SwitchPositions.BEEP:
units = "BEEP";
//todo - future task not important
break;
case SwitchPositions.DIODE:
units = "DIODE";
//todo - future task not important
break;
case SwitchPositions.HZdutycycle:
if (negertiveValue)
{
units = "duty cycle %";
valueMuntiplyer = 0.01M;
}
else
{
switch (range)
{
case 0:
units = "Hz";
valueMuntiplyer = 0.001M;
break;
case 1:
units = "Hz";
valueMuntiplyer = 0.01M;
break;
case 2:
units = "KHz";
valueMuntiplyer = 0.0001M;
break;
case 3:
units = "KHz";
valueMuntiplyer = 0.001M;
break;
case 4:
units = "KHz";
valueMuntiplyer = 0.01M;
break;
case 5:
units = "MHz";
valueMuntiplyer = 0.0001M;
break;
case 6:
units = "MHz";
valueMuntiplyer = 0.001M;
break;
case 7:
units = "MHz";
valueMuntiplyer = 0.01M;
break;
}
}
break;
case SwitchPositions.degF:
units = "°F";
valueMuntiplyer = 0.1M;
if (negertiveValue)
{
valueMuntiplyer *= -1;
}
break;
case SwitchPositions.Percent4To20mA:
units = "%";
valueMuntiplyer = 0.01M;
if (negertiveValue)
{
valueMuntiplyer *= -1;
}
break;
default:
throw (new ApplicationException("switch positon given is invaid"));
}
}
