Ableconn PI232DB9M Compact GPIO TX/RX to DB9M RS232 Serial Expansion Board for Raspberry Pi Connect Raspberry Pi TX / RX on GPIO header to a DB9M RS232 Serial port Level shifter serial transmit (TX) and receive (RX) TTL level from the Pi to RS232 standard communication signals up to +- 25V. Includes a PCBA and Pin Header cable for connecting with Pi GPIO. Ideal to connect serial communication RS232 peripherals, industrial equipment (such as PLCs), serial console ports and special purpose equipment Supports baud rate up to 230 Kbps; Supports VCC input 2.7V ~ 5.25V CE, FCC, and Fully RoHS compliant. High quality product. Made in Taiwan.