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Need to make RS-232< - >RS-422 conversion for async communication? Black Box has five new economical interface converters with a variety of connectors. All provide 115.2-kbps speed for short-distance transmission or 19.2-kbps speed for communication up to 4000 feet (1219.2 m).
The IC1470A and IC1471A units convert unbalanced RS-232 signals to balanced RS-422 signals. Power is derived from the transmit data line (Pin 2) and the handshake control lines (Pins 4, 5, 6, 8, and 20) when they are in either a positive or negative voltage state. This enables you to use these converters without worrying about software control of the handshake lines.