This is a minimalist terminal program like minicom or cu. The only thing it does is creating a bidirectional connection between stdin/stdout and a terminal device (e.g. serial line). It can also set serial line baudrate, manipulate DTR/RTS modem lines, send break and throttle transmission speed.

The -d and -r option create short pulse on DTR/RTS. Linux always raises these lines when the device is opened and those options lower the lines immediately after opening.

For more details see the man page.

make
make install