diff --git a/dataformatpanel.h b/dataformatpanel.h
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--- /dev/null
+++ b/dataformatpanel.h
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+/*
+  Copyright © 2015 Hasan Yavuz Özderya
+
+  This file is part of serialplot.
+
+  serialplot is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  serialplot is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with serialplot.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef DATAFORMATPANEL_H
+#define DATAFORMATPANEL_H
+
+#include <QWidget>
+#include <QButtonGroup>
+#include <QTimer>
+#include <QSerialPort>
+#include <QList>
+#include <QtGlobal>
+
+#include "framebuffer.h"
+
+namespace Ui {
+class DataFormatPanel;
+}
+
+class DataFormatPanel : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit DataFormatPanel(QSerialPort* port,
+                             QList<FrameBuffer*>* channelBuffers,
+                             QWidget *parent = 0);
+    ~DataFormatPanel();
+
+    unsigned numOfChannels();
+    unsigned samplesPerSecond();
+    bool skipByteEnabled(void); // true for binary formats
+
+public slots:
+    // during next read operation reader will skip 1 byte,
+    // requests are not accumulated
+    void requestSkipByte();
+    void pause(bool);
+    void enableDemo(bool); // demo shouldn't be enabled when port is open
+
+signals:
+    void numOfChannelsChanged(unsigned);
+    void samplesPerSecondChanged(unsigned);
+    void skipByteEnabledChanged(bool);
+    void dataAdded();
+
+private:
+    enum NumberFormat
+    {
+        NumberFormat_uint8,
+        NumberFormat_uint16,
+        NumberFormat_uint32,
+        NumberFormat_int8,
+        NumberFormat_int16,
+        NumberFormat_int32,
+        NumberFormat_float,
+        NumberFormat_ASCII
+    };
+
+    Ui::DataFormatPanel *ui;
+    QButtonGroup numberFormatButtons;
+
+    QSerialPort* serialPort;
+    QList<FrameBuffer*>* _channelBuffers;
+
+    unsigned int _numOfChannels;
+    NumberFormat numberFormat;
+    unsigned int sampleSize; // number of bytes in the selected number format
+    bool skipByteRequested;
+    bool paused;
+
+    const int SPS_UPDATE_TIMEOUT = 1;  // second
+    unsigned _samplesPerSecond;
+    unsigned int sampleCount;
+    QTimer spsTimer;
+
+    // demo
+    QTimer demoTimer;
+    int demoCount;
+
+    void selectNumberFormat(NumberFormat numberFormatId);
+
+    // points to the readSampleAs function for currently selected number format
+    double (DataFormatPanel::*readSample)();
+
+    // note that serialPort should already have enough bytes present
+    template<typename T> double readSampleAs();
+
+    // `data` contains i th channels data
+    void addChannelData(unsigned int channel, double* data, unsigned size);
+
+private slots:
+    void onDataReady();      // used with binary number formats
+    void onDataReadyASCII(); // used with ASCII number format
+    void onNumberFormatButtonToggled(int numberFormatId, bool checked);
+    void onNumOfChannelsSP(int value);
+    void spsTimerTimeout();
+    void demoTimerTimeout();
+};
+
+#endif // DATAFORMATPANEL_H