DescriptionAsync RS-232 to RS-485 Interface Converter, DB9 Female to RJ-11Quick Facts 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.Further Details The RS-232 connector is DB9 female; the RS-485 connector is RJ-11; other connectors are available (see RelatedItems). Built-in silicon avalanche diode surge protection against data loss and equipment damage from transient surges. You can also "fine tune" impedance and "echo" characteristics for your individual application. For configuration, the converter features two internal 4-position DIP switches