The power transmitter is connected to a DI1 on a 2100-A4, 1 pulse per watt.

Line Setup

Counter Scaling setup

The rate scale is set to 3600, to give a rate value of Watts, so will be drawn at 1000, if 1000 pulses arrive per hour.
Note: the rate display of the graph will so a little variation because of timing variations between the computers clock and the counter messages arriving from the station.