Black Box Async RS-232 to RS-422 Interface Converter - DB9 to Terminal Block

For DB9 equipment, if the peripheral operates on the RS-422 signal, use only one DB9 converter. But if the transmitting and receiving equipment only operates on RS-232, use two converters. All provide 115.2-kbps speed for distances up to 4000 feet (1219.2 m). Transmit data up to 115 kbps or at distancesup to 4000 ft. Operates point to point only 4-wire operation, full-duplex async (data leads) only. Interface powered by the RS232 control leads