Brainchild PR10 - Convert Data Function; Read AI Function

Page 469 of 479
int rcv = (5+(RegQuantities*2));
/* Send snd bytes content of msg to COMM port */
/* Receive rcv bytes of response from COMM port to MbsBuf */
if (receiving data length is same as rcv)
return true;
else
return false;
}
8.3.3 Convert Data Function
/****************************************************************/
// Parameter:
// ValueRangeLo -> Minimum value of the value range
// ValueRangeHi -> Maximum value of the value range
// ScaleLo -> Minimum value of the scale value
// ScaleHi -> Maximum value of the scale value
// RegData -> Current register data from remote device
/****************************************************************/
double ConvertData(double ValueRangeLo,
double ValueRangeHi,
double ScaleLo,
double ScaleHi,
double RegData)
{
double ConvertValue;
ConvertValue = (((RegData*(ScaleHi - ScaleLo))/ (ValueRangeHi - ValueRangeLo)) + ScaleLo);
return ConvertValue;
}
8.3.4 Read AI Function
bool ReadAIData(void)
{
unsigned char MsgBuf[40];
unsigned char Addr = 1; /* Slave Id */
unsigned short StartRegAdd = 2;
unsigned short RegQuantities = 5;
int ScaleLo, ScaleHi,
ValueRangeLo, ValueRangeHi,
AiData;
unsigned short RegData;
// Read register data from remote device
ReadData(Addr, StartRegAdd, RegQuantities, MsgBuf);
// Step 1: Parsing data for AI1
RegData = MAKEWORD(MsgBuf[4], MsgBuf[3]);
// Step 2: Set value range
//Because AI data type was set as 2 bytes, the value range would be
// showing between -32768 to 32767