- Provides async data rates up to 115.2 kbps over two or four wires. - Half- or full-duplex operation over two or four wires. - Point-to-point or multipoint operation. - Distances up to 9 miles (14.4 km). - Operates with or without transmit "echo." - Two-wire half-duplex turnaround controlled by the RS-232 RTS signal.