BARTINGTON INSTRUMENTSPage 12 of 15 OM3227/29. MS3 Meter Visual CheckThe MS3 meter should now be operating normally, and the LED at the computer end of the bodyof the meter should be flashing green.If not, then follow the guide below:LED status Problem ActionNo LEDindicationNo power supply; 5V supply notconnected to computer side ofthe MS3.Check the condition of the USBcable, and that it is properlyconnected both ends.If using the RS-232 special cable,ensure it is connected to the 5Vmains adaptor.Steady orange The MS3 is communicating withthe computer, but there is nosensor detected.Ensure that a sensor is connected.Check the condition of the cable,and that the connectors are tight.Ensure the drivers have beeninstalled on the computer and areworking (go to Control Panel →Device Manager).Steady red The MS3 is not communicatingwith the computer.Check that the USB cable isproperly connected and inspect thecable visually for breaks.Ensure the drivers have beeninstalled on the computer and areworking (go to Control Panel →Device Manager).When using the RS-232, Bartsoftwill not operate if the MS3 protocolis set to A. Ensure that the MS3has been set to either B or Ccommunication mode.If using the RS-232 special cable,ensure it is connected to the5V mains adaptor, and that it isswitched on.