If you have a PC with an RS232 interface I would plug it into the pump and check things out using hyperterminal.
That will confirm you have the serial port on the pump setup and working as you expect.
Then move on to using the Arduino.
If you have a PC with an RS232 interface I would plug it into the pump and check things out using hyperterminal.
That will confirm you have the serial port on the pump setup and working as you expect.
Then move on to using the Arduino.