Modbus function 1 (01 hex), Read Coil Status/Read Coils.
[Visual Basic] Overloads Public Function readCoils( _ ByVal slaveAddr As Integer, _ ByVal startRef As Integer, _ ByVal bitArr As Boolean() _ ) As Integer
[C#] public int readCoils( 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 coils 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 outputs (coils, 0:00000 table).