Black Box ASYNC RS232 to RS-422 Interface Bidirectional
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RS422 pin-outs match an SMPTE video standard-compatible controlling device.
For DB9 equipment, if the peripheral operates on the RS422 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).