diff --git a/software/script/chameleon_cli_main.py b/software/script/chameleon_cli_main.py
index 8f8ded7..89a2409 100644
--- a/software/script/chameleon_cli_main.py
+++ b/software/script/chameleon_cli_main.py
@@ -147,11 +147,21 @@ class ChameleonCLI:
         :return:
         """
         self.print_banner()
+        closing = False
         while True:
             # wait user input
             status = f"{colorama.Fore.GREEN}USB" if self.device_com.isOpen() else f"{colorama.Fore.RED}Offline"
             print(f"[{status}{colorama.Style.RESET_ALL}] chameleon --> ", end="")
-            cmd_str = input().strip()
+            try:
+                cmd_str = input().strip()
+            except EOFError:
+                print("")
+                closing = True
+
+            if closing or cmd_str == "exit":
+                print("Bye, thank you.  ^.^ ")
+                self.device_com.close()
+                sys.exit(996)
 
             # clear screen
             if cmd_str == "clear":
@@ -163,10 +173,6 @@ class ChameleonCLI:
                     print("No screen clear implement")
                 continue
 
-            if cmd_str == "exit":
-                print("Bye, thank you.  ^.^ ")
-                sys.exit(996)
-
             # parse cmd
             cmd_map, args_str = self.parse_cli_cmd(cmd_str)
             is_exec_map = 'unit' in cmd_map
diff --git a/software/script/chameleon_cli_unit.py b/software/script/chameleon_cli_unit.py
index 4e6e029..562bfad 100644
--- a/software/script/chameleon_cli_unit.py
+++ b/software/script/chameleon_cli_unit.py
@@ -935,9 +935,7 @@ class HWSlotOpenAll(DeviceRequiredUnit):
         lf_type = chameleon_cmd.TagSpecificType.TAG_TYPE_EM410X
 
         # set all slot
-        for slot in range(8):
-            # the slot not from 0 offset, so we can inc 1.
-            slot = slot + 1
+        for slot in range(1,9):
             print(f' Slot{slot} setting...')
             # first to set tag type
             self.cmd_positive.set_slot_tag_type(slot, hf_type)
diff --git a/software/script/chameleon_com.py b/software/script/chameleon_com.py
index cbe72c3..f4bad59 100644
--- a/software/script/chameleon_com.py
+++ b/software/script/chameleon_com.py
@@ -52,6 +52,7 @@ class ChameleonCom:
         self.serial_instance: serial.Serial = None
         self.send_data_queue = queue.Queue()
         self.wait_response_map = {}
+        self.event_closing = threading.Event()
 
     def isOpen(self):
         """
@@ -83,6 +84,7 @@ class ChameleonCom:
             self.send_data_queue.queue.clear()
             self.wait_response_map.clear()
             # Start a sub thread to process data
+            self.event_closing.clear()
             threading.Thread(target=self.thread_data_receive, ).start()
             threading.Thread(target=self.thread_data_transfer, ).start()
             threading.Thread(target=self.thread_check_timeout, ).start()
@@ -115,6 +117,7 @@ class ChameleonCom:
             Close chameleon and clear variable
         :return:
         """
+        self.event_closing.set()
         try:
             self.serial_instance.close()
         except:
@@ -140,7 +143,8 @@ class ChameleonCom:
             try:
                 data_bytes = self.serial_instance.read()
             except Exception as e:
-                print(f"Serial Error {e}, thread for receiver exit.")
+                if not self.event_closing.is_set():
+                    print(f"Serial Error {e}, thread for receiver exit.")
                 self.close()
                 break
             if len(data_bytes) > 0: