Real Time Plotting Tool ( Oscilloscope )

I'm interested in using the SimPlot software with an RS232 connected laser displacement sensor (Acuity AR600). The software will connect and scroll realtime data in the watch window, but nothing displays in the plot window. I suspect that the data format is incorrect. I believe the incoming data from the sensor is an ascii string representing a floating point value from 0.0000 to 2.0000.

Can someone tell me how to translate this data stream into something that SimPlot can understand?