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Amazon.com: RS232 Serial Port to TTL Converter Module for Equipment Upgrades Like DVD with 4 20CM Doupont Cables : Electronics
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Amazon.com: HiLetgo 10pcs Mini RS232 to TTL MAX3232 to TTL Level Converter Board Serial Converter Board RS232 to TTL Serial : Electronics
8 Channel Relay Module,12V 8-Channel DB9 RS 232 Relay Module Remote Control Switch Smart Home - - Amazon.com
Amazon.com: Tripp Lite Serial over Cat5 / Cat6 RS232 Extender, Transmitter and Receiver (B165-101),Black : Electronics
Amazon.com: Cablemax RS-232 LED link Tester DB-9 Male to DB-9 Female : Electronics
