Call Up another system and act as a dial-in/serial terminal or perform file transfers with no error checking. More information: https://manned.org/cu.
sudo cu --line {{/dev/ttyUSB0}}
sudo cu --line {{/dev/ttyUSB0}} --speed {{115200}}
sudo cu --line {{/dev/ttyUSB0}} --speed {{115200}} --halfduplex
sudo cu --line {{/dev/ttyUSB0}} --speed {{115200}} --parity={{even|odd|none}} --nortscts --nostop
cu
session when in connection:<Enter><~><.>