Controlling / Communicating with RS-485 devices from your PC has never been easier! This device is plug-and-play - It shows up as a serial/com port and can be accessed from applications or hyper-terminal. This converter provides half-duplex RS-485 communication. The Baud rate range is 75 bps to 115200 bps, maximum up to 6 Mbps. No external power is required for operation. This device uses the widely supported Prolific PL2303 HXA USB-to-Serial chip -
Drivers are readily available for download here (
http://www.prolific.com.tw/US/ShowProduct.aspx?p_id=225&pcid=41 ) (Windows XP, Vista, Mac OSX) and may already be included in your operating system (Windows 7 and Linux).