This adapter helps to convert TTL (Transistor-Transistor Logic) level signals to RS232 interface. This converter has a Male DB9 connector. Extended Vcc operation nodes: 1.8V, 3.3V, or 5.0V. You can use this on 1.8V, 3.3V, or 5.0V projects. This is capable of running at data rates up to 1000Kbps (1Mbps) while maintaining RS232 compatible output levels. The operating temperature range: -40°C to +85°C Integrated level-shifting functionality eliminates the need for additional level shifter while interfacing with low-voltage microcontrollers. Suitable for use with most microcontrollers. Compatible with PandaBoard, UDOO, Edison, Odroid, Orange Pi, Raspberry Pi, and any micro controller, such as ARM Cortex, PIC, Atmel, STM or other system with TTL serial communications. NS-TRS232-02 (Male Type) RTS (Board) > DIN2 (TRS3122E) DOUT2 > Pin 7 (Male DB-9 connector) CTS (Board)