diff -r 9543e1703afb -r 52372bbbc0f8 MiniDisplay/FutabaVfd.cpp
--- a/MiniDisplay/FutabaVfd.cpp	Wed May 28 11:42:49 2014 +0200
+++ b/MiniDisplay/FutabaVfd.cpp	Wed May 28 15:23:41 2014 +0200
@@ -73,7 +73,7 @@
 
 GP1212A01A::GP1212A01A():
 	iDisplayPositionX(0),iDisplayPositionY(0),
-	iOffScreenMode(true),iFrameBuffer(NULL)
+    iOffScreenMode(true),iFrameBuffer(NULL),iRequest(ERequestNone),iPowerOn(false)
 	{
 	//ResetBuffers();
 	}
@@ -381,8 +381,14 @@
 
 /**
 */
-void GP1212A01A::RequestId()
+void GP1212A01A::RequestDeviceId()
     {
+    if (RequestPending())
+        {
+        //Abort silently for now
+        return;
+        }
+
     //1BH,5BH,63H,49H,44H
     //Send Read ID command
     FutabaVfdReport report;
@@ -393,13 +399,22 @@
     report[4]=0x63; //Command ID
     report[5]=0x49; //Command ID
     report[6]=0x44; //Command ID
-    Write(report);
+    if (Write(report)==report.Size())
+        {
+        iRequest=ERequestDeviceId;
+        }
     }
 
 /**
 */
 void GP1212A01A::RequestFirmwareRevision()
     {
+    if (RequestPending())
+        {
+        //Abort silently for now
+        return;
+        }
+
     //1BH,5BH,63H,46H,52H
     //Send Software Revision Read Command
     FutabaVfdReport report;
@@ -410,13 +425,21 @@
     report[4]=0x63; //Command ID
     report[5]=0x46; //Command ID
     report[6]=0x52; //Command ID
-    Write(report);
+    if (Write(report)==report.Size())
+        {
+        iRequest=ERequestFirmwareRevision;
+        }
     }
 
 /**
 */
 void GP1212A01A::RequestPowerSupplyStatus()
     {
+    if (RequestPending())
+        {
+        //Abort silently for now
+        return;
+        }
     //1BH,5BH,63H,50H,4DH
     //Send Power Suppply Monitor Command
     FutabaVfdReport report;
@@ -427,7 +450,10 @@
     report[4]=0x63; //Command ID
     report[5]=0x50; //Command ID
     report[6]=0x4D; //Command ID
-    Write(report);
+    if (Write(report)==report.Size())
+        {
+        iRequest=ERequestPowerSupplyStatus;
+        }
     }
 
 
@@ -444,3 +470,39 @@
 	SwapBuffers();
 	Clear();
 	}
+
+/**
+ */
+GP1212A01A::Request GP1212A01A::AttemptRequestCompletion()
+    {
+    if (!RequestPending())
+        {
+        return ERequestNone;
+        }
+
+    int res=Read(iInputReport);
+
+    if (!res)
+        {
+        return ERequestNone;
+        }
+
+    //Process our request
+    if (CurrentRequest()==GP1212A01A::ERequestPowerSupplyStatus)
+        {
+        if (iInputReport[1]==0x4F && iInputReport[2]==0x4E)
+            {
+            iPowerOn = true;
+            }
+        else if (iInputReport[1]==0x4F && iInputReport[2]==0x46 && iInputReport[3]==0x46)
+            {
+            iPowerOn = false;
+            }
+        }
+
+    Request completed=iRequest;
+    //Our request was completed
+    iRequest=ERequestNone;
+
+    return completed;
+    }