diff --git a/CMakeLists.txt b/CMakeLists.txt
index 443cfde..00445ca 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,5 +6,15 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
 aux_source_directory(3rdparty/libmodbus DIRSRCS)
 include_directories(3rdparty/libmodbus include)
 
-set(SOURCE_FILES tests/main.cpp)
-add_executable(main ${SOURCE_FILES} ${DIRSRCS})
+set(SOURCE_FILES
+    tests/main.cpp
+    src/ConnectionConfig.h
+    src/IModbusAdapter.h
+    src/ModbusAdapter.h
+    src/ModbusAdapter.cpp
+)
+
+add_executable(main
+    ${SOURCE_FILES}
+    ${DIRSRCS}
+)
diff --git a/src/ConnectionConfig.h b/src/ConnectionConfig.h
new file mode 100644
index 0000000..09bd306
--- /dev/null
+++ b/src/ConnectionConfig.h
@@ -0,0 +1,43 @@
+#pragma once
+
+#include <string>
+
+enum class ConnectionPort
+{
+    CP_EXTERNAL,
+    CP_IOBUS,
+    CP_TCP
+};
+
+enum class Parity
+{
+    P_ODD,
+    P_EVEN,
+    P_NONE
+};
+
+class ConnectionConfig
+{
+public:
+    ConnectionConfig( ConnectionPort port, int baud = 115200, Parity parity = Parity::P_NONE, int dataBits = 8, int stopBits = 1 )
+    {
+
+    }
+
+    ConnectionConfig( ConnectionPort port, const std::string &ip, int portnum, int timeOut = -1  )
+    {
+
+    }
+
+private:
+
+    /// Serial connections
+    ConnectionPort  m_serPort;
+    int             m_baudRate;
+    Parity          m_parity;
+    int             m_dataBits;
+    int             m_stopBits;
+
+    /// TCP connections
+
+};
diff --git a/src/IModbusAdapter.h b/src/IModbusAdapter.h
new file mode 100644
index 0000000..c83af9b
--- /dev/null
+++ b/src/IModbusAdapter.h
@@ -0,0 +1,10 @@
+/****************************************************************************
+ * Copyright (c) 2022 Priva b.v.
+ ****************************************************************************/
+
+#pragma once
+
+class IModbusAdapter
+{
+    virtual ~IModbusAdapter() {}
+};
diff --git a/src/ModbusAdapter.cpp b/src/ModbusAdapter.cpp
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/ModbusAdapter.cpp
diff --git a/src/ModbusAdapter.h b/src/ModbusAdapter.h
new file mode 100644
index 0000000..9a6a8ce
--- /dev/null
+++ b/src/ModbusAdapter.h
@@ -0,0 +1,22 @@
+/*****************************************************************************
+ * Copyright (c) 2022 Priva b.v.
+ *****************************************************************************/
+
+#pragma once
+
+#include "ConnectionConfig.h"
+#include "IModbusAdapter.h"
+
+/// \brief  This class represents a single modbus context. Each context will
+///         result in an instance of this class. It is not intended to be
+///         created directly but through a factory. The factory will create
+///         the object and return the pointer to its interface.
+
+class ModbusAdapter : public IModbusAdapter
+{
+public:
+    ModbusAdapter();
+    virtual ~ModbusAdapter();
+
+    void ModbusConnectRTU(const ConnectionConfig &conncfg);
+};