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Nulsom Inc. Ultra Compact Rs232 To Ttl Converter With Male Db9 (3.3V To 5V)This adapter helps to convert TTL (Transistor-Transistor Logic) level signals to RS-232 interface. This converter has a Male DB9 connector. Suitable for use with most microcontrollers, 300 to 115,200 bps (up to 230,400 bps). [ Please consider NS-TRS232-02 (ASIN: B074BMLM11)..