Without giving much information to work with I am going to assume your trying to connect over USB. If that's the case, make sure the USB COM port is set to either AUTO or the exact com port as shown on your device manager.
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-ReefRockerLive
Current Tank Info: Rimless 67g | GHL Profilux 3.1T eX | 2x GHL Doser 2 dosers | 2xGHL Mitras LX7 LED | Abyzz a100 | Bubble King DC 150 | 2x Vortech MP40w QD | Fauna Marin Zeomatic 2.2ltr | Fauna Marin Zeolight System | Fauna Marin Balling Light Method
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