diff --git a/Arduino/SenderTrial2/SenderTrial2.ino b/Arduino/SenderTrial2/SenderTrial2.ino
index 44a78da..d74e56c 100644
--- a/Arduino/SenderTrial2/SenderTrial2.ino
+++ b/Arduino/SenderTrial2/SenderTrial2.ino
@@ -235,6 +235,16 @@ void loop()
         CommState.is(CommStates::HeaterRx1) ||  
         CommState.is(CommStates::HeaterRx2) ) {
 
+      if(CommState.is(CommStates::OEMCtrlRx)) {
+        DebugPort.println("Timeout collecting OEM controller data, returning to Idle State");
+      }
+      else if(CommState.is(CommStates::HeaterRx1)) {
+        DebugPort.println("Timeout collecting OEM heater response data, returning to Idle State");
+      }
+      else {
+        DebugPort.println("Timeout collecting BTC heater response data, returning to Idle State");
+      }
+
       CommState.set(CommStates::Idle);  // revert to idle mode
     }
   }
diff --git a/Documentation/V7 - Hacking the Chinese Diesel Heater Communications Protocol.pdf b/Documentation/V7 - Hacking the Chinese Diesel Heater Communications Protocol.pdf
new file mode 100644
index 0000000..ec65027
Binary files /dev/null and b/Documentation/V7 - Hacking the Chinese Diesel Heater Communications Protocol.pdf differ