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The Alpha 87A command protocol offers a full set to completely control the amplifier - including switching it on and off. However the amplifier status has to be polled. The software does this every 500 milliseconds by default or by any other value you set in the Programm Settings. The software also calculates the VSWR and displays it on the bottom panel as well as the Operating Frequency, Reflected Power, Grid Current, Peak Power and Input Power.