diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MainActivity.java b/mpmaster/src/main/java/com/xypower/mpmaster/MainActivity.java
index 051224d2..acab5cb3 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MainActivity.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MainActivity.java
@@ -90,6 +90,23 @@ public class MainActivity extends AppCompatActivity {
             }
         });
 
+        findViewById(R.id.btnTurn485On).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                SysApi.setRS485Enable(true);
+                SysApi.set12VEnable(true);
+            }
+        });
+
+        findViewById(R.id.btnTurn485Off).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                SysApi.set12VEnable(false);
+                SysApi.setRS485Enable(false);
+            }
+        });
+
+
         startMicroPhotoService(getApplicationContext());
     }