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Digi Edgeport/1 USB-to-Serial Adapter - 1 Pack - 1 x 9-pin DB-9 RS-232 Serial Male - 1 x 4-pin Type B Female 301-1001-15 (Inc. Tax) $124.99
Black Box DB9 Mini Converter (USB to Serial), USB/RS-485 (4-wire, Terminal Block) - 1 x Type B USB 2.0 USB Female - 1 x 9-pin DB-9 RS-485 Serial - TAA Compliant IC833A (Inc. Tax) $132.99
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