Black Box IC1474A-F serial converter/repeater/isolator RS-232 RS-422

Async RS232 to RS-422 Interface Bidirectional Converter, DB9 Female to DB9 Female Quick Facts - Converts unbalanced RS-232 signals to balanced RS-422 signals. - The RS-232 side has a DB9 port configured as DCE. - The RS-422 side has a DB9 connector.
Further Details - RS-422 pin-outs match an SMPTE video standard-compatible controlling device. - 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. - Provides 115.2-kbps speed for distances up to 4000 feet (1219.2 m).