MbusMasterFunctions.readMultipleFloats Method (Int32, Int32, Single[], Int32)

Modbus function 3 (03 hex) for 32-bit float data types, Read Holding Registers/Read Multiple Registers as float data.

[Visual Basic]
Overloads Public Function readMultipleFloats( _
   ByVal slaveAddr As Integer, _
   ByVal startRef As Integer, _
   ByVal float32Arr As Single(), _
   ByVal numRegs As Integer _
) As Integer

[C#]
public int readMultipleFloats(
   int slaveAddr,
   int startRef,
   float[] float32Arr,
   int numRegs
);

Parameters

slaveAddr: Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef: Start reference (Range: 1 - $10000)
float32Arr: Buffer which will be filled with the data read.
numRegs: Number of values to be read (Range: 1-62).

Return Value

BusProtocolErrors.FTALK_SUCCESS on success or error code. See BusProtocolErrors for possible error codes.

Remarks

Reads the contents of pairs of consecutive output registers (holding registers, 4:00000 table) into float values.

Note Modbus does not know about any other data type than discretes and 16-bit registers. Because a float value is of 32-bit length, it will be transferred as two consecutive 16-bit registers. This means that the amount of registers transferred with this function is twice the amount of float values passed to this function.

Note No broadcast supported

MbusMasterFunctions.readMultipleFloats Method (Int32, Int32, Single[], Int32)

Parameters

Return Value

Remarks

See Also