Unsure what you mean but assuming you have installed the software & have a lead to connect from your RS232 port to the LK201, load software, select a new project, set up communications i.e. com1, 9600, even 1 stop bit (you may need to check settings on LK201 module then go on-line. it is not possible to describe everything here, I suggest you read the help files or find info on web sites although the C20 is now an old plc & probably not supported.