Omega Engineering”sminiature IC11 intelligent RS-232 to RS-422/485 converter can beselected for half/full duplex, allowing transmission distances of up to1,220 m (4,000”). Attach one end to an RS-232 device and connect theother end (screw terminals) to an RS-422/485 device. The converterprovides data transfer rates up to 120 kbps. Power is acquired directlyfrom a computer”s serial port, or using the included USB-plugcable.  Includes complete operator”s manual. Great for PC-basedprocess monitoring & control. Applications include chemical,petroleum, water and environmental industries.