diff --git a/参考文档（21-30）/custom_components/bus485_example/switch.py b/参考文档（21-30）/custom_components/bus485_example/switch.py
index 30486d5..3682ccd 100644
--- a/参考文档（21-30）/custom_components/bus485_example/switch.py
+++ b/参考文档（21-30）/custom_components/bus485_example/switch.py
@@ -53,7 +53,7 @@ class my_switch(SwitchDevice):
         self._address = address
         self._coil = coil
         self._is_on = False
-        self._name = 'my_relay_' + str(bytes([address,coil]))
+        self._name = 'my_relay_' + str(address) + '_' + str(coil)
 
     @property
     def is_on(self):