Serial Port Complete - Latest Microcontroller projects

Chapter 7

 Public Function IsLongLine
(ByVal propagationRate As Integer,
ByVal cableLength As Integer,
ByVal driverRiseTime As Integer)
As Boolean

If (propagationRate * cableLength * 12) > _

(driverRiseTime * 1000 / 2) Then

IsLongLine = True

Else

IsLongLine = False

End If

End Function

 public bool IsLongLine(Int32 propagationRate, Int32 cableLength, Int32 driverRiseTime)
{
bool IsLongLineReturn = false;

if ((propagationRate * cableLength * 12) > (driverRiseTime * 1000 / 2))

{

IsLongLineReturn = true;

}

else

{

IsLongLineReturn = false;

}

return IsLongLineReturn;

}

The function below returns the maximum length of a short line (lumped sys-

tem) for a specific propagation rate and rise time. The variables are the propaga-

tion rate in ps/in. (propagationRate), the driver rise time in ns/in.

(driverRiseTime), and the maximum length of a short line in ft (Maximum-

LengthOfShortLine.