NulSom Inc. Ultra Compact RS232 to TTL Converter with Female DB9 (3.3V to 5V)

This adapter helps to convert TTL (Transistor-Transistor Logic) level signals to RS-232 interface. This converter has a Female DB9 connector.
Suitable for use with most microcontrollers, 300 to 115,200 bps (up to 230,400 bps). [ Please consider NS-TRS232-01 (ASIN: B074BTGLJN ) for High-speed RS232 communication (up to 1Mbps) ]
Compatible with Arduino, Raspberry Pi, and any micro controller, such as PIC, Atmel, STM or other system with TTL serial communications.
Operate with 3V to 5.5V power supply. You can use this on both your 3.3V and 5V projects. [ For 1.8V projects please consider NS-TRS232-01 (ASIN: B074BTGLJN ). ]
Perfect for any RS232 to TTL electronic projects.
Manual: http://www.nulsom.com/datasheet/NS-RS232_en.pdf

RTS (Board) > T2IN (SP3232EEY) T2OUT > Pin 8 (Female DB-9 connector)
CTS (Board) < R2OUT (SP3232EEY) R2IN < Pin 7 (Female DB-9 connector)