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Black Box Universal RS-232 to RS-422/485 Converter - 1 x DB-9 RS-232, 1 x Terminal Block - ExternalUniversal RS-232 to RS-422/485 Converter with Opto-Isolation isolates and converts RS-232 signals into RS-422/RS-485 signals and vice versa. Unlike other converters, external software is not required to control data flow. Manufacturer: Black Box Corpo..