FieldTalk™ Modbus Master .NET Library

MbusMasterFunctions.readMultipleLongInts Method (Int32, Int32, Int32[], Int32)

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

[Visual Basic]
Overloads Public Function readMultipleLongInts( _
   ByVal slaveAddr As Integer, _
   ByVal startRef As Integer, _
   ByVal int32Arr As Integer(), _
   ByVal numRegs As Integer _
) As Integer
[C#]
public int readMultipleLongInts(
   int slaveAddr,
   int startRef,
   int[] int32Arr,
   int numRegs
);

Parameters

slaveAddr
Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef
Start reference (Range: 1 - $10000)
int32Arr
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 32-bit long int values.

Note    Modbus does not know about any other data type than discretes and 16-bit registers. Because a long int 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 int values passed to this function.
Note    No broadcast supported

See Also

MbusMasterFunctions Class | FieldTalk Namespace | MbusMasterFunctions.readMultipleLongInts Overload List