diff --git a/include/SerialCmd.h b/include/SerialCmd.h
index cf7a8fe..2c9eaf7 100644
--- a/include/SerialCmd.h
+++ b/include/SerialCmd.h
@@ -29,6 +29,8 @@ int SerialCmd_checkCmdArrayForPrefix (void);
 
 uint32_t SerialCmd_parseColor(unsigned int startOffset);
 
+int SerialCmd_parseNumber(unsigned int startOffset);
+
 char SerialCmd_type(void);
 void SerialCmd_help(void);
 
diff --git a/src/SerialCmd.cpp b/src/SerialCmd.cpp
index a607dd6..aeae799 100644
--- a/src/SerialCmd.cpp
+++ b/src/SerialCmd.cpp
@@ -21,6 +21,19 @@
 
 static char myCmd[CMD_MAX];
 
+/******************************************************************************
+ *                            LOCAL FUNCTIONS
+ ******************************************************************************/
+
+static unsigned int readLowNipple(int i, unsigned int startOffset);
+
+static unsigned int readHighNipple(int i, unsigned int startOffset);
+
+
+/******************************************************************************
+ *                           EXTERNAL FUNCTIONS
+ ******************************************************************************/
+
 /**
  * @brief 
  * number of read bytes
@@ -108,26 +121,26 @@ char SerialCmd_type(void)
  * @brief Color
  * Extract color of the following six bytes
  * @param startOffset 
- * @return uint32_t 
+ * @return uint32_t Color as red, green and blue, @see Color
  */
 uint32_t SerialCmd_parseColor(unsigned int startOffset)
 {
   unsigned int colorParts[3]; /* 0: red, 1: green, 2: blue */
 
-  if (startOffset > (CMD_MAX - sizeof(colorParts)))
+  if (startOffset > (CMD_MAX - (sizeof(colorParts) * 2)))
   {
     return 0;
   }
 
   for (int i=0; i < (2*3); i+= 2)
   {
-    colorParts[i/2] = (myCmd[i+startOffset] <= '9') ? ((myCmd[i+startOffset]-'0') << 4) : (((myCmd[i+startOffset]-'A')+10) << 4);
+    colorParts[i / 2] = readHighNipple(i, startOffset);
     if (colorParts[i/2] < 0)
     {
         Serial.print("calcErr:"); 
         Serial.println(colorParts[i/2]);
     }
-    colorParts[i/2] += ( (myCmd[i+startOffset+1] <= '9') ? (myCmd[i+startOffset+1]-'0') : (((myCmd[i+startOffset+1]-'A')+10)) );
+    colorParts[i / 2] += readLowNipple(i, startOffset);
   }
   int r = colorParts[0]; /* fill red */
   int g = colorParts[1]; /* fill green */
@@ -136,6 +149,38 @@ uint32_t SerialCmd_parseColor(unsigned int startOffset)
   return Color(r, g, b);
 }
 
+static unsigned int readLowNipple(int i, unsigned int startOffset)
+{
+  return ((myCmd[i + startOffset + 1] <= '9') ? (myCmd[i + startOffset + 1] - '0') : (((myCmd[i + startOffset + 1] - 'A') + 10)));
+}
+
+static unsigned int readHighNipple(int i, unsigned int startOffset)
+{
+  return (myCmd[i + startOffset] <= '9') ? ((myCmd[i + startOffset] - '0') << 4) : (((myCmd[i + startOffset] - 'A') + 10) << 4);
+}
+
+/**
+ * @brief 
+ * Parse the following two bytes as hex values
+ * @param startOffset 
+ * @return int number (0-255) or negative values on failure
+ */
+int SerialCmd_parseNumber(unsigned int startOffset)
+{
+
+  if (startOffset > (CMD_MAX - 2))
+  {
+    return -1;
+  }
+  else
+  {
+    int value=0;
+    value = readHighNipple(0, startOffset);
+    value += readLowNipple(0, startOffset);
+    return value;
+  }
+}
+
 void SerialCmd_help(void)
 {
   Serial.println(SERIALCMD_COMMAND_HELP);
diff --git a/src/main.cpp b/src/main.cpp
index b1c10d0..5b49ee4 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -39,6 +39,7 @@
 
 /******************* Settings for command mode ***************/
 #define COMMAND_BRIGHTNESS    200
+#define PERCENT_MAX           100
 
 /******************************************************************************
  *                            LOCAL VARIABLES
@@ -215,11 +216,23 @@ void loop()
       case SERIALCMD_COMMAND_AUTOMATIC[0]:
         mAutomaticTargetRPM = RPM_CONTROL_DEACTIVATED;
         break;
+      case SERIALCMD_COMMAND_FAN[0]:
+        mAutomaticTargetRPM = SerialCmd_parseNumber(SERIALCMD_PARAMETER_OFFSET);
+        if (mAutomaticTargetRPM > PERCENT_MAX)
+        {
+            mAutomaticTargetRPM = PERCENT_MAX;
+        }
+        break;
       }
     }
   }
   pixels->show();
 
+  if ((mAutomaticTargetRPM > fanSpeedPercent))
+  {
+    fanSpeedPercent = mAutomaticTargetRPM;
+  }
+
   Serial.print(fanSpeedPercent);
   Serial.print("%;");
   setFanSpeedPercent(fanSpeedPercent);