diff --git a/SofarWechselrichter/form.json b/SofarWechselrichter/form.json
index b3a46e1..bee616d 100644
--- a/SofarWechselrichter/form.json
+++ b/SofarWechselrichter/form.json
@@ -7,12 +7,22 @@
     {
       "type": "ValidationTextBox",
       "name": "IPAddress",
-      "caption": "Inverter IP-Adresse"
+      "caption": "Inverter IP-Adresse",
+      "validate": {
+        "required": true,
+        "pattern": "^((25[0-5]|2[0-4]\\d|[01]?\\d?\\d)(\\.(?!$)|$)){4}$",
+        "errorMessage": "Bitte eine gültige IPv4-Adresse eingeben."
+      }
     },
     {
       "type": "ValidationTextBox",
       "name": "LoggerNumber",
-      "caption": "Logger-Seriennummer"
+      "caption": "Logger-Seriennummer",
+      "validate": {
+        "required": true,
+        "pattern": "^\\d+$",
+        "errorMessage": "Nur Dezimalziffern erlaubt."
+      }
     },
     {
       "type": "NumberSpinner",
@@ -53,8 +63,7 @@
           "width": "200px",
           "add": 1,
           "edit": {
-            "type": "NumberSpinner",
-            "digits": 0
+            "type": "NumberSpinner"
           }
         },
         {
@@ -74,4 +83,4 @@
     }
   ],
   "actions": []
-}
+}
\ No newline at end of file