USBGear offers TTL adapters to provide connectivity between your USB and serial UART interfaces. USB TTL adapters vary in voltage and can be monitored with LED indicators. The USB to TTL interface supports the full range rs232 serial UART signals. USBGear has what you need for your communication to RS232 applications.
USB TTL adapter with integrated USB type-A port incorporates a 6-wire terminal block and individual wires with TTL header pin connectors to connect as you see fit. The voltage of 5V or 3.3V is set by jumper settings on the circuit board anf supports RS232 signals GND, CTS#, RTS#, TxD, RxD, and VCC with LED indicators for power, TxD, and RxD.