diff --git a/NIDAQmxInterface.cpp b/NIDAQmxInterface.cpp
index fe20f6b..23ad797 100644
--- a/NIDAQmxInterface.cpp
+++ b/NIDAQmxInterface.cpp
@@ -223,9 +223,9 @@ void NIDAQmxInterface::DAQmxSetDO(uInt8 qry_port_bit, bool arm_timer, bool isSet
     if (daq->do_port != 0)
     {
         if(isSet){
-            daq->do_bit_wrt |= 1 << qry_port_bit;
+            daq->do_bit_wrt |= 1 << qry_port_bit-1;
         }else{
-            daq->do_bit_wrt &= ~(1 << qry_port_bit);
+            daq->do_bit_wrt &= ~(1 << qry_port_bit-1);
         }
         DAQmxErrChk(DAQmxWriteDigitalU8(daq->do_port, 1, 1, 10.0, DAQmx_Val_GroupByChannel, &daq->do_bit_wrt, &written, NULL));
     }
@@ -240,12 +240,12 @@ void NIDAQmxInterface::DAQmxSetDO(uInt8 qry_port_bit, bool arm_timer, bool isSet
     /* arm time out if required */
     if ((daq->do_clk != 0) & (arm_timer == TRUE))
     {
-
         DAQmxErrChk(DAQmxIsTaskDone(daq->do_clk, &done));
         daq->do_bit_qry = (done) ? qry_port_bit : (daq->do_bit_qry | qry_port_bit);
         DAQmxErrChk(DAQmxStopTask(daq->do_clk));
         DAQmxErrChk(DAQmxStartTask(daq->do_clk));
     }
+
     /* log trigger */
     QString timeString = QTime::currentTime().toString("hh:mm:ss.zzz");
     emit(writeToLogFile("TRIGGER", qry_port_bit, (qry_port_bit & daq->do_bit_wrt) == qry_port_bit, timeString));
@@ -275,6 +275,7 @@ int32 CVICALLBACK NIDAQmxInterface::FcnCbckDetectDI(TaskHandle taskHandle, int32
             /* switch OFF box internal resonance generator */
             //DAQmxTriggerDO(DAQ_PORT_DO_FREQGEN, FALSE);
             DAQmxSetDO(DAQ_PORT_DO_FREQGEN, FALSE, FALSE);
+            qDebug()<< "switch OFF box internal resonance generator";
 
         }
 
@@ -285,6 +286,7 @@ int32 CVICALLBACK NIDAQmxInterface::FcnCbckDetectDI(TaskHandle taskHandle, int32
             /* switch ON box internal resonance generator */
             //DAQmxTriggerDO(DAQ_PORT_DO_FREQGEN, FALSE);
             DAQmxSetDO(DAQ_PORT_DO_FREQGEN, FALSE, TRUE);
+            qDebug()<< "switch ON box internal resonance generator";
         }
 
         /* FRAME condition, line 2 changes from 1 to 0 */