USB to 3-channel RS-485 Converter Hub 

 
Introduction
  The I-7563 is a cost-effective module for transfer serial data over USB. It allows you to connect your serial devices to systems using a USB interface. Connecting the I-7563 to a PC, The I-7563 contains "Self Tuner" This chip auto-tunes the baud rate and data format to the Rs-485 network. The I-7563 module derives the power from the USB port and doesn't need any power adapter. It also features a high-speed 115.2 Kb/s transmission rate, and supports various O.S. 
  Do you have any RS-485 wiring problems? The I-7563 is USB to three ports RS-485 Hub. Each channel has  its own RS-485 driver IC on it, so it can support star-shaped wiring.
Features 
Full compatibility with USB 1.1 specifications.
Input Port: USB
Output Port: Three RS-485
Speed: "Self Tuner" inside
3000 Vdc isolation protection provided
Photo-coupler isolation: 2500V rms
256 modules max. (All channels)
RS-485 network without repeater.
2048 modules max. (All channels)
RS-485 network with repeater 
Repeater request:4,000 feet or over  256  modules
Plug-and-play installation
The I-7563 gets the power from USB port;no need external power supply
Windows 98/ME/2000/XP and Linux drivers supported. Driver for other operating system are currently under development
 Specifications
Compatibility: USB 1.1 standard
Input port: USB
Output port: Three Port RS-485
Cable: USB type A connector (Type A to Type B cable provided)
RS-485 signals: DATA+, DATA-
"Self Tuner" inside, support multiple Baud Rate and multiple Dtat Format.
256 modules max. (All channels)
RS-485 network without repeater.
Repeater request:4,000 feet or over 256 modules
Communication distance:1.2Km/9600 bps
Mounting: Din-rail, wall mounting piggyback stack
Operating temperature:-25C to +75C
Storage temperature:-25C to +80C
Humidity:5~95%
Dimensions:123 mm x 72 mm x 33 mm
Driver supported: Windows 98/ME/2000/XP and Linux

Manual