diff --git a/src/main.py b/src/main.py
index e2a539f..7290604 100644
--- a/src/main.py
+++ b/src/main.py
@@ -124,10 +124,10 @@ class App(ctk.CTk):
                 slider.configure(button_color="grey")
                 slider.configure(state="disabled")
             else:
-                self.gain_values[i] = slider.get()
-
                 value.set(f"{self.gain_values_store[i]:.2f}")
                 slider.set(self.gain_values_store[i])
+                self.gain_values[i] = slider.get()
+
                 slider.configure(button_color="#1f538d")
                 slider.configure(state="normal")
             return None
@@ -351,7 +351,8 @@ class App(ctk.CTk):
                     bytes = list(map(lambda x: ord(x), list(switchSign(i))))
                     bytes.append(int(self.gain_values[i]))
                     bytes.append(int(self.gain_values[i] % 1 * 256))
-                    bytes.append(0)
+                    bytes.append(ord('e'))
+                    bytes.append(ord('d'))
                     print(f"Send:{bytes} \t Hex:0x" + f"{hex(int( self.gain_values[i] * 256 )).replace('0x', '')}".zfill(4))
                     self.serial.write(bytes)
         else:
@@ -360,7 +361,7 @@ class App(ctk.CTk):
 
     def setvideo(self, video: int) -> None:
         try:
-            is_open = self.serial.is_open()
+            is_open = self.serial.is_open
         except AttributeError:
             messagebox.showError("Please Connect to Serial")
         else: