diff --git a/src/main/java/ch/hevs/isi/field/BooleanRegister.java b/src/main/java/ch/hevs/isi/field/BooleanRegister.java
index 205f596..a2a343e 100644
--- a/src/main/java/ch/hevs/isi/field/BooleanRegister.java
+++ b/src/main/java/ch/hevs/isi/field/BooleanRegister.java
@@ -19,6 +19,9 @@ public class BooleanRegister extends ModbusRegister{
         updateMapOfRegisters(label, address);       //add the address to the map
     }
     @Override
+    /**
+     * function to read a boolean datapoint from the modbus register
+     */
     public void read() {
         if(bdp.isOutput()){
             return;      //if it is an output datapoint, it is not read
@@ -27,6 +30,9 @@ public class BooleanRegister extends ModbusRegister{
     }
 
     @Override
+    /**
+     * function to write a boolean datapoint on the modbus register
+     */
     public void write(DataPoint dp) {
         bdp = (BooleanDataPoint) dp;    //make the empty datapoint to the desired datapoint, which is to be written on the address
         value = bdp.getValue();         //store the value of the datapoint
diff --git a/src/main/java/ch/hevs/isi/field/FieldConnector.java b/src/main/java/ch/hevs/isi/field/FieldConnector.java
index 23a372c..6eb438b 100644
--- a/src/main/java/ch/hevs/isi/field/FieldConnector.java
+++ b/src/main/java/ch/hevs/isi/field/FieldConnector.java
@@ -14,12 +14,17 @@ import java.util.Timer;
 public class FieldConnector implements DataPointListener {
     private static FieldConnector mySelf = null;
 
+    /**
+     * private constructor
+     * initialize the FieldConnector
+     * it connects the ModbusAccessor, reads the csv-file of the ModbusMap
+     * and starts the periodical polling of the modbus registers
+     */
     private FieldConnector(){
         initialize("LocalHost",1502, "src/main/resources/ModbusMap.csv");
 
 
         // Subscribe to the update of DataPoints
-
         DataPointListener.subscribeUpdate(this);
     }
 
@@ -89,10 +94,20 @@ public class FieldConnector implements DataPointListener {
         startPeriodicalPolling();                               //start periodical reading of the values
 
     }
+
+    /**
+     * this function is only to show the datapoint, which is pushed to filed in the onNewValue function
+     * @param label label of the datapoint
+     * @param value value of the datapoint
+     */
     private void pushToField(String label, String value){
         Utility.pDebug("Field: " + label + " " + value);
     }
     @Override
+    /**
+     * everytime a new value should be writen by any connector, this function is called
+     * updates the value of the datapoint on the field
+     */
     public void onNewValue(DataPoint dp) {
         ModbusRegister mR = ModbusRegister.getRegisterFromDatapoint(dp);    //search the corresponding register to the datapoint
         if(mR == null) return; //if the register is not found, return
diff --git a/src/main/java/ch/hevs/isi/field/FloatRegister.java b/src/main/java/ch/hevs/isi/field/FloatRegister.java
index 56f5e03..09ae2be 100644
--- a/src/main/java/ch/hevs/isi/field/FloatRegister.java
+++ b/src/main/java/ch/hevs/isi/field/FloatRegister.java
@@ -28,17 +28,23 @@ public class FloatRegister extends ModbusRegister{
     }
 
     @Override
+    /**
+     *  function to read a float datapoint from the modbus register
+     */
     public void read() {
         if(fdp.isOutput()){
             return;     //if it is an output datapoint, it is not read
         }
         Float value = ModbusAccessor.getMySelf().readFloat(this.getAddress()); //read the value
-        value = value * range;
-        value = value + offset;
+        value = value * range;      //calculate value
+        value = value + offset;     //calculate value
         fdp.setValue(value);
     }
 
     @Override
+    /**
+     * function to write a boolean datapoint on the modbus register
+     */
     public void write(DataPoint dp) {
         fdp = (FloatDataPoint) dp;      //make the empty datapoint to the desired datapoint, which is to be written on the address
         value = fdp.getValue();         //store the value of the datapoint
diff --git a/src/main/java/ch/hevs/isi/field/ModbusRegister.java b/src/main/java/ch/hevs/isi/field/ModbusRegister.java
index 6c87cff..4fbc915 100644
--- a/src/main/java/ch/hevs/isi/field/ModbusRegister.java
+++ b/src/main/java/ch/hevs/isi/field/ModbusRegister.java
@@ -14,7 +14,7 @@ public abstract class ModbusRegister {
     public int getAddress() {
         return address;
     }
-    private final static HashMap<String, ModbusRegister> mapOfRegisters = new HashMap<>();
+    private final static HashMap<String, ModbusRegister> mapOfRegisters = new HashMap<>();      //map to store the register
 
     /**
      * get the modbus register from the desired datapoint
@@ -43,6 +43,15 @@ public abstract class ModbusRegister {
             mr.read();      //read each datapoint, which address is stored in the map
         }
     }
+
+    /**
+     * function to read a datapoint from the modbus register
+     */
     public abstract void read();        //abstract prototype of the method read
+
+    /**
+     * function to write datapoint on the modbus register
+     * @param dp datapoint to write on the address
+     */
     public abstract void write(DataPoint dp);       //abstract prototype of the method read
 }