ATEN RS-232 TO RS-485/RS-422 Reversible Converter (Non Powered) IC485SN Data transmission controlled by the RTS signal. DCE/DTE selectable. Point to point, multidrug, and simplex/duplex link selection. Four wire full duplex; two wire half duplex. Compact size. Cable distance of up to 1200m (4000 ft.). Non powered operation. Data Transmission Controlled by the RTS Signal DCE/DTE Selectable Point to Point, Multidrop and Simplex/Duplex Link Selectable Four Wire Full Duplex / Two Wire Half Duplex Non Powered Operation Compact Size