diff --git a/das-dn/hostadsbf/hostadsbf.cpp b/das-dn/hostadsbf/hostadsbf.cpp
index 81de95c9..84b8a3d9 100644
--- a/das-dn/hostadsbf/hostadsbf.cpp
+++ b/das-dn/hostadsbf/hostadsbf.cpp
@@ -963,8 +963,10 @@ BOOLEAN CHostADSBFProcess::OnTimer(void)
         last_sec = system32.timers;
         sec_changed = TRUE;
     }
+    vLog(LOG_DEBUG, "%s sec is changed %d\n", m_pidName.c_str(), sec_changed);
     if (sec_changed)
     {
+        vLog(LOG_DEBUG, "%s not connected.\n", m_pidName.c_str());
         if (m_turbine == NULL)
         {
             vLog(LOG_DEBUG, "%s not connected.\n", m_pidName.c_str());
@@ -1006,6 +1008,7 @@ BOOLEAN CHostADSBFProcess::OnTimer(void)
                 readFileID();
             }
         }
+        vLog(LOG_DEBUG, "%s read data.\n", m_pidName.c_str());
         readRealData();
         vLog(LOG_DEBUG, "%s feed dog.\n", m_pidName.c_str());
         FeedDog();