Echelon i.LON SmartServer 2.0 - Manual (Page 95)

i.LON SmartServer 2.0 Programming Tools User’s Guide 81
Reading Data Point Properties
You can read the name, alias name, time of last update, and status of each data point declared in the
FPM application in the Initialize(), Work(), and OnTimer()routines. To read these data
point properties, you use a collection of get property methods belonging to each data point. The
methods that you can call to read the data point properties are as follows:
Data Point
Property Get Property Method
Name const char* GetDpPropertyAsString(FPM::Dp::cfgUCPTname)
Alias name
const char*
GetDpPropertyAsString(FPM::Dp::cfgUCPTAliasName)
Time of
Last Update timespec
GetDpPropertyAsTimeSpec(FPM::Dp::dataUCPTlastUpdate)
Status
FPM::Dp::PointStatus
GetDpPropertyAsPointStatus(FPM::Dp::dataUCPTstatus)
The following code demonstrates how to read data point properties using these methods:
void CUFPTHVACController::Work()
{
const char* nviSetPoint_name;
const char* nviSetPoint_AliasName;
timespec nviSetPoint_lastUpdateTime;
FPM::Dp::PointStatus nviTemp_status;
nviSetPoint_name =
nviSetPoint.GetDpPropertyAsString(FPM::Dp::cfgUCPTname);
nviSetPoint_AliasName =
nviSetPoint.GetDpPropertyAsString(FPM::Dp::cfgUCPTAliasName);
nviSetPoint_lastUpdateTime =
nviSetPoint.GetDpPropertyAsTimeSpec(FPM::Dp::dataUCPTlastUpdate);
nviTemp_status =
nviTemp.GetDpPropertyAsPointStatus(FPM::Dp::dataUCPTstatus);
if (nviTemp_status == FPM::Dp::AL_ALM_CONDITION)
{
nvoHVACMode = hvac_t::HVAC_COOL;
}
}
Reading Data Point Values
You can directly read the values of the scalar, structured, and enumerated data points declared in your
FPM application in the Work() routine. Upon reading the data points, you can execute code based on
the current values stored in them.
Reading Scalar Data Points
You can directly read the value of a scalar data point declared in your FPM by simply referencing its
name.
void CUFPTHVACController::Work()
{
if (nviTemp > nviSetPoint + (nciHysteresis*1.8+32))
//execute some code