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.
The USB to serial UART TTL adapter is auto sensing and is supported in Windows 10 or earlier OS and Mac OS and Linux. The serial UART adapter electronics automatically sense the voltage for its operation. Transmit and receive LED lights are embedded into the translucent USB molded jacket.