An automated packing system includes a first conveyor conveying goods to a location where the goods are dropped off a belt. The bus signal encoding method includes receiving a bus signal, XOR-operating all but the first byte sequence of the bus signal in a bitwise manner, inverting the even-numbered byte sequences of the XOR-operated bus signal in a bitwise manner, and serializing the inverted bus signal. Text at a marker associated with the viewfinder is recognized and insertion of the recognized text is performed.