M485 USB-I is a cost-effective module for transferring serial data via USB. It allows you to connect your serial devices to systems that use a USB interface. Connecting the M485 USB-I to a PC you get an RS-232 / 422/485 port. Contains a "self-tuner" chip that automatically sets baud rate and data format for the RS-485 network. Gets its power from the USB port and does not need any power adapter.