The USB-i485 module is a cost-effective way to convert RS485 or RS422 industrial buses to a USB interface. When connected to a PC USB port the USB-i485 module is automatically detected and is installed as a native COM port which is compatible with any existing serial communication application.
Muliple modules can be installed when using USB hubs thus allowing a hassle-free configuration of a multi serial  system without any IRQ or DMA configuration.
1500 Vdc isolation between the USB port and RS485/RS422 protects the PC from spykes or possible misconnections in the communication bus.
The USB-i485 converter can be configured for four-wire  (Full Duplex) RS422 and  RS485 or two-wire (Half Duplex) networks. When operating in two-wire RS485 the data transfer control is automatically done by the converter.

• Two independent and isolated RS485 networks can be supported by one USB-i485 module thus duplicating the possible number of remote devices.
• Computer interface: USB V1.1 Plug and Play
• Operational system virtual serial port driver
• Supports Windows 7/Vista/XP/2008Server/2003Server/98/ME/2000/CE, MAC and Linux 2.4.20 or above. 64 bit options for latest operating systems. 
• Field Interfaces: RS485 Half Duplex (dual buses), RS485 Full Duplex or RS422
• Jumper selected RS485 / RS422 
• Automatic flow control for RS485 Half Duplex 
• 120 Ohms internal resistors termination enabled by jumpers 
• Transmission rate: from 300 bps to 250 kbps
• MaximumRS485/RS422 cable length: 1200 m
• Maximum number of devices in the RS485 network    
• Half Duplex: 2 x 32 devices
• Full Duplex: 32 devices

Data transmission and reception LED indicators 

• Power: from the USB port
• Consumption: <100 mA
• Isolation: 1500 Vdc from USB interface and the RS485/RS422 interface 
• RS485/422 bus protection: ±60 Vdc, 15 kV ESD 
• USB connection: Mini-B connector 
• A 1.5 m cable with plugs mini-B and A is provided with the module 
• RS485/422 connector: screw terminal type accepting 1.5 mm² (16 AWG) wires
• ABS enclosure: 70 x 60 x 18 mm 
• Operating environment: 0 to 70°C, 10 to 90% relative humidity, non-condensing