Use Raspberry as RS232 gateway (with USB adapter)

README.txt

# on Raspberry Pi

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install ser2net
# check if /dev/ttyUSB0 exist
sudo echo "2000:raw:600:/dev/ttyUSB0:115200 8DATABITS NONE 1STOPBIT banner" >> /etc/ser2net.conf
sudo service ser2net restart 


# on remote machine (debian based)
# change ADDRESS_OF_RASPBERRY with the IP address
sudo apt-get install socat supervisor
cat >/etc/supervisor/conf.d/socat.conf <<EOL
command = /usr/bin/socat pty,link=/root/dev/ttyV0 tcp:ADDRESS_OF_RASPBERRY:2000
autorestart = true
user = root
EOL

sudo supervisorctl reload
sudo supervisorctl start socat

# now you can access to the remote serial port through /root/dev/ttyV0