diff --git a/servapps/mbusd/cosmos-compose.json b/servapps/mbusd/cosmos-compose.json
index 29bf24b5..0b83e66d 100644
--- a/servapps/mbusd/cosmos-compose.json
+++ b/servapps/mbusd/cosmos-compose.json
@@ -38,7 +38,20 @@
           ["8O1", "8O1: 8 databits, odd parity, 1 stoppbit"],
           ["8N2", "8N2: 8 databits, no parity, 2 stoppbit"]
         ]
+      },
+      {
+        "name": "exposePort",
+        "label": "expose Modbus-Server to local network? (insecure)",
+        "initialValue": false,
+        "type": "checkbox"
+      }{if Context.exposePort}
+      , {
+        "name": "exposedPort",
+        "label": "Which Port would you like to expose to the local network? (May NOT be used by another Service)",
+        "initialValue": "502",
+        "type": "text"
       }
+      {/if}
     ],
     "translation": {
       "de": {
@@ -55,7 +68,9 @@
           ["ttyACM1", "/dev/ttyACM1 -> Serieller Anschluss 1 -> KNX, RS485 oder RS232"],
           ["ttyACM2", "/dev/ttyACM2 -> Serieller Anschluss 2 -> RS485 oder RS232"],
           ["ttyACM3", "/dev/ttyACM3 -> Serieller Anschluss 3 -> RS485 oder RS232"]
-        ]        
+        ],
+        "form.exposePort.label": "Modbus-Server im lokalen Netzwerk veröffentlichen? (unsicher)",
+        "form.exposedPort.label": "Welchen Port möchten Sie für das lokale Netzwerk freigeben? (Darf NICHT von einem anderen Dienst verwendet werden)"
       }
     }
   },
@@ -84,9 +99,12 @@
           "target": "/usr/app",
           "type": "volume"
         }
-      ],
-      "ports": [
-        "502:502"
-      ]    }
+      ]
+      {if Context.exposePort}
+      , "ports": [
+        "{Context.exposedPort}:502"
+      ]
+      {/if}
+    }
   }
 }
\ No newline at end of file