The six pin definitions are: DTR RX TX VCC CTS GND FT232RL USB to serial port module USB to TTL level Brush in the USB-RS232-TTL line USB2TTL protected version overcurrent protection version! ! With USB2.0FT232RL chip, USB power supply protects your USB power and equipment with 500MA fuse (FUSE)! More stable performance! ! This product uses a new design to convert USB to serial port. Available in two power versions. Each module is tested by the self-receiving 10W bytes before leaving the factory! ! PCB board size: 17mmx32.5mm The FT232R chip is a single-chip solution that typically uses essentially no peripherals. The EEPROM, USB matching resistors, and EEPROM for placing product information are already integrated. The FT232R has some more useful features. See the FT232R data sheet for details. [Hardware Introduction] · Adopted FT232RL chip; ·Export all signal ports of FT232RL chip, TTL/CMOS level; · RXD/TXD transceiver communication indicator; USB powered, selectable 5V or 3.3V interface level (if other levels are required, the target voltage can be provided directly on the VCC and GND pins).