diff --git a/Modbus.Net/Modbus.Net.BigEndian3412/Modbus.Net.BigEndian3412ValueHelper.cs b/Modbus.Net/Modbus.Net.BigEndian3412/Modbus.Net.BigEndian3412ValueHelper.cs
index c826d6e..8c652ef 100644
--- a/Modbus.Net/Modbus.Net.BigEndian3412/Modbus.Net.BigEndian3412ValueHelper.cs
+++ b/Modbus.Net/Modbus.Net.BigEndian3412/Modbus.Net.BigEndian3412ValueHelper.cs
@@ -5,6 +5,8 @@ namespace Modbus.Net
     public partial class Endian
     {
         public const int BigEndian3412 = 10;
+
+        public const int LittleEndian3412 = 11;
     }
 
     public class BigEndian3412ValueHelper : BigEndianLsbValueHelper
@@ -36,6 +38,196 @@ namespace Modbus.Net
         public new static BigEndian3412ValueHelper Instance
             => _bigEndian3412Instance ?? (_bigEndian3412Instance = new BigEndian3412ValueHelper());
 
+        public override int GetInt(byte[] data, ref int pos)
+        {
+            Array.Reverse(data, pos, 4);
+            byte temp;
+            temp = data[pos]; data[pos] = data[pos + 2]; data[pos + 2] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 3]; data[pos + 3] = temp;
+            var t = BitConverter.ToInt32(data, pos);
+            temp = data[pos]; data[pos] = data[pos + 2]; data[pos + 2] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 3]; data[pos + 3] = temp;
+            Array.Reverse(data, pos, 4);
+            pos += 4;
+            return t;
+        }
+
+        public override uint GetUInt(byte[] data, ref int pos)
+        {
+            Array.Reverse(data, pos, 4);
+            byte temp;
+            temp = data[pos]; data[pos] = data[pos + 2]; data[pos + 2] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 3]; data[pos + 3] = temp;
+            var t = BitConverter.ToUInt32(data, pos);
+            temp = data[pos]; data[pos] = data[pos + 2]; data[pos + 2] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 3]; data[pos + 3] = temp;
+            Array.Reverse(data, pos, 4);
+            pos += 4;
+            return t;
+        }
+
+        public override long GetLong(byte[] data, ref int pos)
+        {
+            Array.Reverse(data, pos, 8);
+            byte temp;
+            temp = data[pos]; data[pos] = data[pos + 6]; data[pos + 6] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 7]; data[pos + 7] = temp;
+            temp = data[pos + 2]; data[pos + 2] = data[pos + 4]; data[pos + 4] = temp;
+            temp = data[pos + 3]; data[pos + 3] = data[pos + 5]; data[pos + 5] = temp;
+            var t = BitConverter.ToInt64(data, pos);
+            temp = data[pos]; data[pos] = data[pos + 6]; data[pos + 6] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 7]; data[pos + 7] = temp;
+            temp = data[pos + 2]; data[pos + 2] = data[pos + 4]; data[pos + 4] = temp;
+            temp = data[pos + 3]; data[pos + 3] = data[pos + 5]; data[pos + 5] = temp;
+            Array.Reverse(data, pos, 8);
+            pos += 8;
+            return t;
+        }
+
+        public override ulong GetULong(byte[] data, ref int pos)
+        {
+            Array.Reverse(data, pos, 8);
+            byte temp;
+            temp = data[pos]; data[pos] = data[pos + 6]; data[pos + 6] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 7]; data[pos + 7] = temp;
+            temp = data[pos + 2]; data[pos + 2] = data[pos + 4]; data[pos + 4] = temp;
+            temp = data[pos + 3]; data[pos + 3] = data[pos + 5]; data[pos + 5] = temp;
+            var t = BitConverter.ToUInt64(data, pos);
+            temp = data[pos]; data[pos] = data[pos + 6]; data[pos + 6] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 7]; data[pos + 7] = temp;
+            temp = data[pos + 2]; data[pos + 2] = data[pos + 4]; data[pos + 4] = temp;
+            temp = data[pos + 3]; data[pos + 3] = data[pos + 5]; data[pos + 5] = temp;
+            Array.Reverse(data, pos, 8);
+            pos += 8;
+            return t;
+        } 
+
+        public override float GetFloat(byte[] data, ref int pos)
+        {
+            Array.Reverse(data, pos, 4);
+            byte temp;
+            temp = data[pos]; data[pos] = data[pos + 2]; data[pos + 2] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 3]; data[pos + 3] = temp;
+            var t = BitConverter.ToSingle(data, pos);
+            temp = data[pos]; data[pos] = data[pos + 2]; data[pos + 2] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 3]; data[pos + 3] = temp;
+            Array.Reverse(data, pos, 4);
+            pos += 4;
+            return t;
+        }
+
+        public override double GetDouble(byte[] data, ref int pos)
+        {
+            Array.Reverse(data, pos, 8);
+            byte temp;
+            temp = data[pos]; data[pos] = data[pos + 6]; data[pos + 6] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 7]; data[pos + 7] = temp;
+            temp = data[pos + 2]; data[pos + 2] = data[pos + 4]; data[pos + 4] = temp;
+            temp = data[pos + 3]; data[pos + 3] = data[pos + 5]; data[pos + 5] = temp;
+            var t = BitConverter.ToDouble(data, pos);
+            temp = data[pos]; data[pos] = data[pos + 6]; data[pos + 6] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 7]; data[pos + 7] = temp;
+            temp = data[pos + 2]; data[pos + 2] = data[pos + 4]; data[pos + 4] = temp;
+            temp = data[pos + 3]; data[pos + 3] = data[pos + 5]; data[pos + 5] = temp;
+            Array.Reverse(data, pos, 8);
+            pos += 8;
+            return t;
+        }
+    }
+
+    public class LittleEndian3412ValueHelper : LittleEndianLsbValueHelper
+    {
+        private static LittleEndian3412ValueHelper _littleEndian3412Instance;
+
+        /// <summary>
+        ///     构造器
+        /// </summary>
+        protected LittleEndian3412ValueHelper()
+        {
+        }
+
+        /// <summary>
+        ///     覆写的实例获取
+        /// </summary>
+        protected override ValueHelper _Instance => _littleEndian3412Instance;
+
+        /// <summary>
+        ///     是否为大端
+        /// </summary>
+        protected new bool LittleEndian => true;
+
+        protected new bool LittleEndianBit => false;
+
+        /// <summary>
+        ///     覆盖的获取实例的方法
+        /// </summary>
+        public new static LittleEndian3412ValueHelper Instance
+            => _littleEndian3412Instance ?? (_littleEndian3412Instance = new LittleEndian3412ValueHelper());
+
+        public override int GetInt(byte[] data, ref int pos)
+        {
+            Array.Reverse(data, pos, 4);
+            byte temp;
+            temp = data[pos]; data[pos] = data[pos + 2]; data[pos + 2] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 3]; data[pos + 3] = temp;
+            var t = BitConverter.ToInt32(data, pos);
+            temp = data[pos]; data[pos] = data[pos + 2]; data[pos + 2] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 3]; data[pos + 3] = temp;
+            Array.Reverse(data, pos, 4);
+            pos += 4;
+            return t;
+        }
+
+        public override uint GetUInt(byte[] data, ref int pos)
+        {
+            Array.Reverse(data, pos, 4);
+            byte temp;
+            temp = data[pos]; data[pos] = data[pos + 2]; data[pos + 2] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 3]; data[pos + 3] = temp;
+            var t = BitConverter.ToUInt32(data, pos);
+            temp = data[pos]; data[pos] = data[pos + 2]; data[pos + 2] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 3]; data[pos + 3] = temp;
+            Array.Reverse(data, pos, 4);
+            pos += 4;
+            return t;
+        }
+
+        public override long GetLong(byte[] data, ref int pos)
+        {
+            Array.Reverse(data, pos, 8);
+            byte temp;
+            temp = data[pos]; data[pos] = data[pos + 6]; data[pos + 6] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 7]; data[pos + 7] = temp;
+            temp = data[pos + 2]; data[pos + 2] = data[pos + 4]; data[pos + 4] = temp;
+            temp = data[pos + 3]; data[pos + 3] = data[pos + 5]; data[pos + 5] = temp;
+            var t = BitConverter.ToInt64(data, pos);
+            temp = data[pos]; data[pos] = data[pos + 6]; data[pos + 6] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 7]; data[pos + 7] = temp;
+            temp = data[pos + 2]; data[pos + 2] = data[pos + 4]; data[pos + 4] = temp;
+            temp = data[pos + 3]; data[pos + 3] = data[pos + 5]; data[pos + 5] = temp;
+            Array.Reverse(data, pos, 8);
+            pos += 8;
+            return t;
+        }
+
+        public override ulong GetULong(byte[] data, ref int pos)
+        {
+            Array.Reverse(data, pos, 8);
+            byte temp;
+            temp = data[pos]; data[pos] = data[pos + 6]; data[pos + 6] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 7]; data[pos + 7] = temp;
+            temp = data[pos + 2]; data[pos + 2] = data[pos + 4]; data[pos + 4] = temp;
+            temp = data[pos + 3]; data[pos + 3] = data[pos + 5]; data[pos + 5] = temp;
+            var t = BitConverter.ToUInt64(data, pos);
+            temp = data[pos]; data[pos] = data[pos + 6]; data[pos + 6] = temp;
+            temp = data[pos + 1]; data[pos + 1] = data[pos + 7]; data[pos + 7] = temp;
+            temp = data[pos + 2]; data[pos + 2] = data[pos + 4]; data[pos + 4] = temp;
+            temp = data[pos + 3]; data[pos + 3] = data[pos + 5]; data[pos + 5] = temp;
+            Array.Reverse(data, pos, 8);
+            pos += 8;
+            return t;
+        }
+
         public override float GetFloat(byte[] data, ref int pos)
         {
             Array.Reverse(data, pos, 4);