... its original condition. 4. Buyer will afford all freight cost.RS232/485 converter is dual interface, with Half Duplex design. And ... , as to realize the long distance(0-3KM) data transmitting RS232/485 converter, as the supporting option of LED controller, strongly ... to used it when distance is over 150M. Usually, installing RS232/485 converter could protect the computer serial port .Connection diagram ...