Initializes a new instance of the PacketType3 class.
            
- binaryImage (array< Byte >[]()[])
 - Binary image to be used for initializing PacketType3.
 
- startIndex (Int32)
 - 0-based starting index of initialization data in the binaryImage.
 
- length (Int32)
 - Valid number of bytes in binaryImage from startIndex.