diff --git a/commandedit.h b/commandedit.h
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--- /dev/null
+++ b/commandedit.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 COMMANDEDIT_H
+#define COMMANDEDIT_H
+
+#include <QLineEdit>
+#include <QValidator>
+#include <QString>
+
+class CommandEdit : public QLineEdit
+{
+    Q_OBJECT
+
+public:
+    explicit CommandEdit(QWidget *parent = 0);
+    ~CommandEdit();
+    void setMode(bool ascii); // true = ascii, false = hex
+    QString unEscapedText(); // return unescaped text(), used in ascii_mode only
+
+private:
+    bool ascii_mode;
+    QValidator* hexValidator;
+    QValidator* asciiValidator;
+
+protected:
+    void keyPressEvent(QKeyEvent * event) Q_DECL_OVERRIDE;
+};
+
+#endif // COMMANDEDIT_H