Documentation

MbusMasterFunctionsreadMultipleRegisters Method (Int32, Int32, Array, Int32)

Modbus function 3 (03 hex), Read Holding Registers (16-bit, 32-bit, 64-bit and floating point single and double).

Namespace:  FieldTalk.Modbus.Master
Assembly:  FieldTalk.Modbus.Master (in FieldTalk.Modbus.Master.dll) Version: 2.15.2-eval+3d8362b4bb861c05760d48b11d303e954bb8597c
Syntax
Copy
public int readMultipleRegisters(
	int slaveAddr,
	int startRef,
	Array regArr,
	int numRegs
)

Parameters

slaveAddr
Type: SystemInt32
Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef
Type: SystemInt32
Start register (Range: 1 - 65536)
regArr
Type: SystemArray
Array which will be filled with the data read. Accepted array types are Int16[], UInt16[], Int32[], UInt32[], Int64[], UInt64[], float[] and double[].
numRegs
Type: SystemInt32
Number of values to be read (Range: 1-125 for 16-bit, 1-62 for 32-bit and floats, 1-31 for 64-bit and doubles).

Return Value

Type: Int32
BusProtocolErrors.FTALK_SUCCESS on success or error code. See BusProtocolErrors for possible error codes.
Remarks
Reads the contents of the holding registers (4:00000 table).
Note Note
No broadcast supported
See Also