I think you have two instruments that generate serial data streams that you want to catch. This is possible with Arduino, although I would recommend a MEGA device, which has four hardware UARTs.
If the line levels are RS232, not TTL, then you would need a MAX232 or similar RS232 line transceiver.
You will need to have details of the protocols of course, and program the Arduino to handle them.
Now that you have your data, you want it "pushed up to pvoutput". Can you explain what this means? What is pvoutput and how is data pushed there?