RTS, CTS in UART

RTS (Require tosend, send request) is an output signal that indicates that the device is ready to receive data, the low level is active, and the low level indicates that the device can receive data.

The CTS (Clear tosend, send allow) is an input signal that determines whether data can be sent to the other, low-level, and low-level instructions that the device can send data to each other.

Here someone will translate CTS to send permission, I feel really better than translation for clear send. Because the CTS is the other side of the RTS control whether the CTS is allowed to send the function.

RTS, CTS in UART