Oh, i see... thanks, i found the converters and they are inexpensive...
They sound like a good option but the thing is that there will be another software layer and i would prefer to communicate through an Arduino. Do you happen to know anything about the mA+/- signal input?
I know even an Arduino can connect to an rs485 converter, but now i'm really curious about the other signal input. I'm hoping it's more straightforward.