diff --git a/fhem/CHANGED b/fhem/CHANGED
index 73cf82024..ca48cdb94 100644
--- a/fhem/CHANGED
+++ b/fhem/CHANGED
@@ -1,5 +1,6 @@
 # Add changes at the top of the list. Keep it in ASCII, and 80-char wide.
 # Do not insert empty lines here, update check depends on it.
+  - feature: 11_OWDevice: new attribute cstrings, fix for trimvalues
   - new:     98_powerMap: introducing new module to calculate power and
                           energy for every FHEM device w/o power meter
   - updated: 38_netatmo.pm: added support for Presence, Homecoach & Webhook
diff --git a/fhem/FHEM/10_OWServer.pm b/fhem/FHEM/10_OWServer.pm
index 692501f86..a928fa29a 100644
--- a/fhem/FHEM/10_OWServer.pm
+++ b/fhem/FHEM/10_OWServer.pm
@@ -661,7 +661,7 @@ OWServer_Set($@)
   <br><br>
 
 
-  <a name="OWDeviceattr"></a>
+  <a name="OWServerattr"></a>
   <b>Attributes</b>
   <ul>
     <li>nonblocking<br>
@@ -804,7 +804,7 @@ OWServer_Set($@)
   </ul>
   <p>
 
-  <a name="OWDeviceattr"></a>
+  <a name="OWServerattr"></a>
   <b>Attribute</b>
   <ul>
     <li>nonblocking<br>
diff --git a/fhem/FHEM/11_OWDevice.pm b/fhem/FHEM/11_OWDevice.pm
index 87cf38f7d..3f6f3780c 100644
--- a/fhem/FHEM/11_OWDevice.pm
+++ b/fhem/FHEM/11_OWDevice.pm
@@ -374,7 +374,7 @@ OWDevice_Initialize($)
   $hash->{UndefFn}   = "OWDevice_Undef";
   $hash->{AttrFn}    = "OWDevice_Attr";
 
-  $hash->{AttrList}  = "IODev uncached trimvalues polls interfaces model ".  
+  $hash->{AttrList}  = "IODev uncached trimvalues polls interfaces model cstrings ".
                        "resolution:9,10,11,12 ".
                        $readingFnAttributes;
 }
@@ -465,7 +465,8 @@ OWDevice_ReadValue($$) {
         #Debug "$path => $value; $msec";  
         if($interface ne "id") {
           if(defined($value)) {
-            $value= trim($value) if(AttrVal($hash,"trimvalues",1));
+            $value=~ s/\0.*$//g  if(AttrVal($hash->{NAME},"cstrings",0));
+            $value= trim($value) if(AttrVal($hash->{NAME},"trimvalues",1));
           } else {
             Log3 $hash, 3, $hash->{NAME} . ": reading $reading did not return a value";
           }
@@ -886,6 +887,7 @@ OWDevice_InitValues($)
        belong to it, then continue with the next OWServer and the attached OWDevices, and so on. 	 
     </li>
     <li>trimvalues: removes leading and trailing whitespace from readings. Default is 1 (on).</li>
+    <li>cstrings: interprets reading as C-style string, i.e. stops reading on the first zero byte. Default is 0 (off).</li>
     <li>polls: a comma-separated list of readings to poll. This supersedes the list of default readings to poll.</li>
     <li>interfaces: supersedes the interfaces exposed by that device.</li>
     <li>model: preset with device type, e.g. DS18S20.</li>
@@ -1044,6 +1046,7 @@ OWDevice_InitValues($)
         nächste OWServer-Instanz, gefolgt von den zugehörigen OWDevice-Geräten, usw.   
     </li>
     <li>trimvalues: Entfernt voran- und nachgestellte Leerzeichen aus den readings. Standartwert ist 1 (ein).</li>
+    <li>cstrings: Interpretiert die readings als C-String, d.h. h&ouml;rt mit dem ersten 0-Byte zu lesen auf. Standardwert ist 0 (off).</li>
     <li>polls: Eine per Komma getrennte Liste der abzurufenden readings. Mit diesem Attribut unterdrückt man alle standartmäßig abgerufenen readings und ersetzt sie durch die eigene Zusammenstellung.</li>
     <li>interfaces: Ersetzt die durch dieses Gerät erzeugten Interfaces.</li>
     <li>model: Angabe des Gerätetyps, z.B.: DS18S20.</li>