tobyb121:
Have you tried connecting your rs232 shield to the rs232 on your PC. Then do a simple sketch to echo your arduino serial connection over rs232 to check that it's connected up properly. This is to make sure its all connected up properly
Yes! I hav made and it work well (look the latest snapshot), now the problem is when I attache the arduino to the weigher, I doesn't receive any reply!
thanks for your support!
Fabio