RTS_CONTROL_TOGGLE top-level constant
int
const RTS_CONTROL_TOGGLE
Specifies that the RTS line will be high if bytes are available for transmission.
After all buffered bytes have been sent, the RTS line will be low.
To learn more, see learn.microsoft.com/windows/win32/api/winbase/ns-winbase-dcb.
Implementation
const RTS_CONTROL_TOGGLE = 3;