iLelouch:
i think so, he exactly wrote: the connection should be via Rs232 in the Arduino Ide
I would like to take the meaning of the statement as follows and then proceed with a suggestion:
1. The Arduino UNO will remain connected with his PC (PC1) via UART (hradware) Port/USB Port of the UNO. In the PC, a Serial Monitor will appear by virtue of the UNO's IDE.
2. Another PC (PC2) will communicate with the Serial Monitor of PC1. The communication linK is: RS232 Port of PC2, MAX232 Chip (RS232 < ----> TTL Conversion), Software UART Port of UNO, Hardware UART Port of UNO, USB Port of UNO, and the Serial Monitor.
4. Now-a-days, it is hard to find PC that is equipped with RS232 Port; the possible connection layout would be as follows:
USB Port of PC2, USB-to-RS232 Converter Cable, MAX232 Chip (RS232 < ----> TTL Conversion), Software UART Port of UNO, Hardware UART Port of UNO, USB Port of UNO, and the Serial Monitor.
On the basis of above, I would suggest the following lay out (too complicated for a beginner!):