Modbus function 2 (02 hex), Read Inputs Status/Read Input Discretes.
[Visual Basic] Overloads Public Function readInputDiscretes( _ ByVal slaveAddr As Integer, _ ByVal startRef As Integer, _ ByVal bitArr As Boolean() _ ) As Integer
[C#] public int readInputDiscretes( intslaveAddr, intstartRef, bool[]bitArr );
Parameters
slaveAddr
Modbus address of slave device or unit identifier (Range: 1 - 255)
startRef
Start reference (Range: 1 - $10000)
bitArr
Buffer which will contain the data read. The length of the array determines how many inputs are read (Range: 1-2000).
Return Value
BusProtocolErrors.FTALK_SUCCESS on success or error code. See BusProtocolErrors for possible error codes.
Remarks
Reads the contents of the discrete inputs (input status, 1:00000 table).