diff --git a/Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs b/Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs
index 2809bbc..86ef099 100644
--- a/Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs
+++ b/Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs
@@ -1130,7 +1130,6 @@ namespace JoyD.Windows.CS.Toprie
             
             // 定义常量
             const int RECEIVE_TIMEOUT = 5000;
-            const int SHORT_SLEEP_MS = 10;
             const int MEDIUM_SLEEP_MS = 50;
             const int LONG_SLEEP_MS = 1000;
             const int ERROR_SLEEP_MS = 100;