diff --git a/OOequipment/Equipment.m b/OOequipment/Equipment.m
index 2b54948..0f747f2 100644
--- a/OOequipment/Equipment.m
+++ b/OOequipment/Equipment.m
@@ -82,9 +82,10 @@ classdef Equipment < handle
         
         function output = read(ecq)
             %READ Extracts recieved data from the TCP-buffer.
-            %This 
+            %This function sends the '++read'-command to the Prologix if
+            %needed. Will always read the TCP-buffer in matlab.
             if ecq.channel >= 0
-                fprintf(ecq.tcp,'++read');
+                write_unsafe('++read');
             end
             output = fscanf(ecq.tcp);
         end
@@ -92,7 +93,9 @@ classdef Equipment < handle
         function output = query(ecq,message)
             %QUERY Sends command to the device and read the respond.
             %The command is send via the WRITE and the respond is collected
+            %from the device.
             %
+            %See also WRITE, READ
             ecq.opc;
             output = ecq.query_unsafe(message);
             ecq.error;
@@ -131,7 +134,7 @@ classdef Equipment < handle
             %error occured after writing. If possible one should always use
             %the WRITE function.
             %
-            %See also WRITE
+            %See also WRITE, QUERY
             if ecq.channel >= 0
                 fprintf(ecq.tcp,['++addr ', num2str(ecq.channel)]);
             end
@@ -139,6 +142,12 @@ classdef Equipment < handle
         end
         
         function output = query_unsafe(ecq,message)
+            %QUERY_UNSAFE Sends command to device and reads device output.
+            %This function does not check if device is ready or check if an
+            %error occured after writing. If possible one should always use
+            %the QUERY function.
+            %
+            %See also QUERY, WRITE, READ
             ecq.write_unsafe(message);
             output = read(ecq);
         end
@@ -155,25 +164,41 @@ classdef Equipment < handle
     
     methods (Static)
         function tcpobject = getTCP(ipAddress,port)
-            persistent tcpconnection;
-            [ipname,ipAddress] = Equipment.ip2structname(ipAddress,abs(port));
-            if port > 0 
+            %GETTCP Returns TCP-object for TCP-connection.
+            %Function makes a TCP-connection for specific ipAddress and
+            %port. If TCP-connection already exist no new connection is
+            %made and only existing handle is returned. 
+            %For existing connections the function will store the amount of
+            %handles in use. Via the DELETE function the connection will be
+            %closed if the connection is not in use anymore.
+            %The connection will be removed if the port is negative number.
+            
+            persistent tcpconnection; %make variable persistent to share tcp-handles across multiple function calls.
+            [ipname,ipAddress] = Equipment.ip2structname(ipAddress,abs(port)); %Get a structname and a cleaned ipaddress.
+            if port > 0 %if port number is positive a connection is made.
                 if isempty(tcpconnection)
-                    tcpconnection = struct;
+                    %if the tcpconnection is empty (first time function
+                    %call) make a struct in the variable.
+                    tcpconnection = struct; 
                 end
 
-                if ~isfield(tcpconnection, ipname)
-                    tcpconnection.(ipname).tcp = tcpip(ipAddress,port);
-                    tcpconnection.(ipname).nopen = 1;
-                    fopen(tcpconnection.(ipname).tcp);
-                else
+                if ~isfield(tcpconnection, ipname)                         %check if the handle is already made before.
+                    tcpconnection.(ipname).tcp = tcpip(ipAddress,port);    %Make TCP-connection
+                    tcpconnection.(ipname).nopen = 1;                      %Set number of connections in use to 1
+                    fopen(tcpconnection.(ipname).tcp);                     %Open the TCP-connection
+                else %If connection already exist. Increase number of connections in use by 1.
                     tcpconnection.(ipname).nopen = tcpconnection.(ipname).nopen + 1;
                 end
-                tcpobject = tcpconnection.(ipname).tcp;
-            elseif port < 0
-                if tcpconnection.(ipname).nopen > 1
-                    tcpconnection.(ipname).nopen = tcpconnection.(ipname).nopen - 1;
+                tcpobject = tcpconnection.(ipname).tcp; %return the TCP-connection handle.
+            elseif port < 0 %If the portnumber is negative the connection is removed.
+                if tcpconnection.(ipname).nopen > 1 
+                    %If more than one object uses this tcp-handle. Decrease
+                    %the number of connections in use by 1.
+                    tcpconnection.(ipname).nopen = tcpconnection.(ipname).nopen - 1; %Decrease the number by 1.
                 else
+                    %If only one handle uses this connection. The
+                    %connection is closed and the field is removed from the
+                    %tcpconnection struct.
                     fclose(tcpconnection.(ipname).tcp);
                     tcpconnection = rmfield(tcpconnection,ipname);
                 end
@@ -183,10 +208,12 @@ classdef Equipment < handle
         end
         
         function bool = isnum(input)
+            %ISNUM Tests if the input is numeric scalar
             bool = isnumeric(input)&&isscalar(input);
         end
 		
 		function num = forceNum(input)
+            %FORCENUM Throws an error if the input is not numeric.
 			if ~isnumeric(input)
 				error('Input should be a (single) number.');
 			end
@@ -194,15 +221,20 @@ classdef Equipment < handle
 		end
         
         function iptest(ipAddress)
+            %IPTEST Checks if the given IPv4-address is valid.
             validip = regexp(ipAddress,'^(?:(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9]))$', 'once');
             if isempty(validip)
                 error('Invalid IP-address');
             end
         end
-        function [structname,cleanIP] = ip2structname(ipAddress,port)
-            cleanIP = regexprep(ipAddress,'(?:(?<=\.)|^)(?:0+)(?=\d)','');
-            Equipment.iptest(cleanIP);
-            structname = matlab.lang.makeValidName(['ip',cleanIP,'_',num2str(port)]);
+        
+        function [structname,cleanip] = ip2structname(ipAddress,port)
+            %IP2STRUCTNAME Returns a structname and ip w/out leading zeros.
+            %structname to store stuff in struct (especially for GETTCP). 
+            %cleanip is a shortened ip without leading zeros.
+            cleanip = regexprep(ipAddress,'(?:(?<=\.)|^)(?:0+)(?=\d)','');
+            Equipment.iptest(cleanip);
+            structname = matlab.lang.makeValidName(['ip',cleanip,'_',num2str(port)]);
         end
     end
 end
\ No newline at end of file