Find out if your RS232 interface is seen and to the serial port attached to
$ lsusb |grep 23 Bus 003 Device 007: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port $ dmesg |grep tty |grep pl [ 3881.178720] usb 3-1: pl2303 converter now attached to ttyUSB0
(Install) Start minicom
$ su # apt-get install minicom # minicom -sa) to set Serial Device and so forth
...
and then Exit to apply configuration and start the terminal emulator
rs232 to terminal emulator debian