The KDH-USB / RS485 converter is used to connect the controller bus to a USB port on a computer with a supervisory program. The device allows conversion of the USB protocol to RS-485 creating a virtual COM port. The converter has surge protection. The USB port is a cable with a USB connector and the RS-485 port has a DB9-M connector. In addition to the DB9-M connector, you can connect an intermediate module with terminals for bus cables.