diff --git a/scripts/quality_control_leds.py b/scripts/quality_control_leds.py
index 120eed6..e6e6c8d 100644
--- a/scripts/quality_control_leds.py
+++ b/scripts/quality_control_leds.py
@@ -37,7 +37,7 @@ def perform_hpos_test(repeat_no, solution, df):
                 # print(data.split('\r'))
                 # if 'SNE' in data:
                 #     ser.write(b'B')
-                if 'BC' in data:
+                if '#BC' in data:
                     ser.write(b'P')
                 if 'REND' in data:
                     # print(data)
@@ -102,7 +102,7 @@ def perform_auto_dac(df):
             while True:
                 data += ser.readline().decode("utf-8")
                 # print(data.split('\r'))
-                if 'CC' in data:
+                if '#CC' in data:
                     # print(data)
                     pattern = re.compile(r'LED(\d+)_DAC: (\d+)')
 
@@ -217,14 +217,50 @@ def buffer_process():
         df_autodac.to_excel(writer, sheet_name = autodac_sheet_name, index=False)
         writer.close()
 
-def analysis_process():
-    df = df.tail(5)
+def diagnostics_process():
+    try:
+        port = sys.argv[1]
+        baud_rate = 9600
+        deviceId = 'QC'
+        data = ""
+        data_list = []
+
+        if not os.path.exists(port):
+            raise FileNotFoundError(f"Port {port} not found.")
+        
+        with serial.Serial(port, baud_rate, timeout=1, parity=serial.PARITY_NONE) as ser:
+            x = ser.read()
+            s = ser.read(10)
+            line = ser.readline()
+
+            ser.write(b'D')
+            while True:
+                data += ser.readline().decode("utf-8")
+                # print(data.split('\r'))
+                if '#DC' in data:
+                    print(data)
+                    print("D_CMD process completed")
+                    return
+        return
+
+    except serial.serialutil.SerialException:
+        print("Device is not connected or resource busy!")
+        raise
+    except FileNotFoundError as e:
+        print(e)
+        raise
+    except Exception as err:
+        print("Error:", err)
+        raise
+    finally:
+        if ser is not None:
+            ser.close()
 
 if __name__ == "__main__":
     # device = Device(0.01, 0.001, '/dev/cu.usbserial-23APB124', 9600)
 
+    diagnostics_process()
+
     autodac_process()
 
-    buffer_process()
-
-    analysis_process()
\ No newline at end of file
+    buffer_process()
\ No newline at end of file