Black Box serial adapter - 0.7 in

Convert async RS232 to RS485 at speeds up to 115.2 kbps with distances up to 4000 ft. over CATx cables. The RS-232 connector is DB9F the RS-485 connector is RJ-45 other connectors are available (see Related Items). 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.