diff --git a/Modbus.Net/Modbus.Net/BaseMachine.cs b/Modbus.Net/Modbus.Net/BaseMachine.cs
index 022d544..3a51ede 100644
--- a/Modbus.Net/Modbus.Net/BaseMachine.cs
+++ b/Modbus.Net/Modbus.Net/BaseMachine.cs
@@ -558,7 +558,7 @@ namespace Modbus.Net
         /// <summary>
         /// 放缩比例
         /// </summary>
-        public double Zoom { get; set; }
+        public double Zoom { get; set; } = 1;
         /// <summary>
         /// 小数位数
         /// </summary>