diff --git a/ThreeByte.LinkLib/ThreeByte.LinkLib.ProjectorLink/Commands/PowerCommand.cs b/ThreeByte.LinkLib/ThreeByte.LinkLib.ProjectorLink/Commands/PowerCommand.cs
index 3f14849..a0f45a7 100644
--- a/ThreeByte.LinkLib/ThreeByte.LinkLib.ProjectorLink/Commands/PowerCommand.cs
+++ b/ThreeByte.LinkLib/ThreeByte.LinkLib.ProjectorLink/Commands/PowerCommand.cs
@@ -48,7 +48,7 @@ internal override bool ProcessAnswerString(string a)
 
             if (_cmdDetail == Power.QUERY)
             {
-                a = a.Replace("%1POWR=", "");
+                a = a.ToUpper().Replace("%1POWR=", "");
                 int retVal = int.Parse(a);
                 if (retVal >= (int)PowerStatus.OFF && retVal <= (int)PowerStatus.WARMUP)
                 {