OMEGA 's miniature IC11 converters provide the features required of high quality interface converters in a miniature package. The RS-232 to RS-422/485 converter can be selected for half/full duplex, and will allow transmission distances of up to 1220m (4000'). The converter allows data transfer rates up to 120 kbps.  Power is acquired directly from a computer's serial port, or using the included USB-plug cable. Applications include chemical, petroleum, water and environmental industries. Price Starts at $89.00.
OMEGA
888-826-6342, www.omega.com
 

Click here for more information: http://www.omega.com/DAS/pdf/IC11.pdf