diff --git a/src/portcontrol.cpp b/src/portcontrol.cpp
--- a/src/portcontrol.cpp
+++ b/src/portcontrol.cpp
@@ -155,6 +155,15 @@ PortControl::PortControl(QSerialPort* po
                 }
             });
 
+    // setup pin update leds
+    ui->ledDCD->setColor(Qt::yellow);
+    ui->ledDSR->setColor(Qt::yellow);
+    ui->ledRI->setColor(Qt::yellow);
+    ui->ledCTS->setColor(Qt::yellow);
+
+    pinUpdateTimer.setInterval(1000); // ms
+    connect(&pinUpdateTimer, &QTimer::timeout, this, &PortControl::updatePinLeds);
+
     loadPortList();
     loadBaudRateList();
     ui->cbBaudRate->setCurrentIndex(ui->cbBaudRate->findText("9600"));
@@ -246,6 +255,7 @@ void PortControl::togglePort()
 {
     if (serialPort->isOpen())
     {
+        pinUpdateTimer.stop();
         serialPort->close();
         qDebug() << "Closed port:" << serialPort->portName();
         emit portToggled(false);
@@ -287,6 +297,10 @@ void PortControl::togglePort()
             serialPort->setDataTerminalReady(ui->ledDTR->isOn());
             serialPort->setRequestToSend(ui->ledRTS->isOn());
 
+            // update pin signals
+            updatePinLeds();
+            pinUpdateTimer.start();
+
             qDebug() << "Opened port:" << serialPort->portName();
             emit portToggled(true);
         }
@@ -348,6 +362,15 @@ void PortControl::onTbPortListActivated(
     ui->cbPortList->setCurrentIndex(index);
 }
 
+void PortControl::updatePinLeds(void)
+{
+    auto pins = serialPort->pinoutSignals();
+    ui->ledDCD->setOn(pins & QSerialPort::DataCarrierDetectSignal);
+    ui->ledDSR->setOn(pins & QSerialPort::DataSetReadySignal);
+    ui->ledRI->setOn(pins & QSerialPort::RingIndicatorSignal);
+    ui->ledCTS->setOn(pins & QSerialPort::ClearToSendSignal);
+}
+
 QString PortControl::currentParityText()
 {
     return paritySettingMap.value(
diff --git a/src/portcontrol.h b/src/portcontrol.h
--- a/src/portcontrol.h
+++ b/src/portcontrol.h
@@ -1,5 +1,5 @@
 /*
-  Copyright © 2016 Hasan Yavuz Özderya
+  Copyright © 2017 Hasan Yavuz Özderya
 
   This file is part of serialplot.
 
@@ -28,6 +28,7 @@
 #include <QAction>
 #include <QComboBox>
 #include <QSettings>
+#include <QTimer>
 
 #include "portlist.h"
 
@@ -65,6 +66,9 @@ private:
     QComboBox tbPortList;
     PortList portList;
 
+    /// Used to refresh pinout signal leds periodically
+    QTimer pinUpdateTimer;
+
     /// Returns the currently selected (entered) "portName" in the UI
     QString selectedPortName();
     /// Returns currently selected parity as text to be saved in settings
@@ -86,9 +90,9 @@ public slots:
 
 private slots:
     void openActionTriggered(bool checked);
-
     void onCbPortListActivated(int index);
     void onTbPortListActivated(int index);
+    void updatePinLeds(void);
 
 signals:
     void portToggled(bool open);
diff --git a/src/portcontrol.ui b/src/portcontrol.ui
--- a/src/portcontrol.ui
+++ b/src/portcontrol.ui
@@ -421,9 +421,12 @@
         </widget>
        </item>
        <item row="2" column="1">
-        <widget class="QLabel" name="labDCE">
+        <widget class="QLabel" name="labDCD">
+         <property name="toolTip">
+          <string>Data Carrier Detect</string>
+         </property>
          <property name="text">
-          <string>DCE</string>
+          <string>DCD</string>
          </property>
          <property name="alignment">
           <set>Qt::AlignCenter</set>
@@ -431,7 +434,7 @@
         </widget>
        </item>
        <item row="2" column="2">
-        <widget class="LedWidget" name="ledDCE" native="true">
+        <widget class="LedWidget" name="ledDCD" native="true">
          <property name="minimumSize">
           <size>
            <width>15</width>
@@ -444,6 +447,9 @@
            <height>15</height>
           </size>
          </property>
+         <property name="toolTip">
+          <string>Data Carrier Detect</string>
+         </property>
         </widget>
        </item>
        <item row="4" column="1">