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Black Box RS-232 to RS-485 Interface Converter - 1 x DB-9 RS-232 , 1 x RS-485 Terminal Block - Internal IC1620A-F (Inc. Tax) $181.99
Black Box RS-232 to RS-422/RS-485 DIN Rail Converter - 2 x RS-232 Terminal Block, 1 x DB-9 - External ICD100A (Inc. Tax) $244.99
Black Box Async RS232 to RS422/485 Interface Converter - DB9 to Terminal Block - 1 x DB-9 RS-232 , 1 x Terminal Block - External IC821A (Inc. Tax) $205.99
TRENDnet RS232 to RS422 RS485 Converter Adapter, Serial Port Data Converter, Black, TI-S100 - 1 x DB-9 RS-232 Serial - Female - 1 x Terminal Block RS-422/485 Serial TI-S100 (Inc. Tax) $10.99
Black Box RS-232 to TTL Bidirectional Converter, DB9 - 1 x 9-pin DB-9 RS-232 Serial Female - 1 x 9-pin DB-9 RS-232 Serial Male - TAA Compliant IC1157A (Inc. Tax) $131.99