NulSom Inc. Ultra Compact RS232 to TTL Converter with Male DB9 and Hood Kit (3.3V to 5V)

This adapter helps to convert TTL (Transistor-Transistor Logic) level signals to RS232 interface. This converter has a Male DB9 connector (NS-RS232-02: B00OPU2QJ4) and a plastic Hood Kit.
Suitable for use with most microcontrollers, 300 to 115,200 bps (up to 230,400 bps).
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.
Perfect for any RS232 to TTL electronic projects.
The operating temperature range: -40°C to +85°C
http://www.nulsom.com/datasheet/NS-RS232_en.pdf

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

Please disconnect this module while uploading as this is shared with Arduino's digital pins 0 and 1 for the serial communication.
This can be connected and used after the sketch code has been uploaded.