diff --git a/src/JT809.Protocol/Formatters/MessageBodyFormatters/JT809_0x1001_Formatter.cs b/src/JT809.Protocol/Formatters/MessageBodyFormatters/JT809_0x1001_Formatter.cs
index 50eaf6c..d89c482 100644
--- a/src/JT809.Protocol/Formatters/MessageBodyFormatters/JT809_0x1001_Formatter.cs
+++ b/src/JT809.Protocol/Formatters/MessageBodyFormatters/JT809_0x1001_Formatter.cs
@@ -18,6 +18,7 @@ namespace JT809.Protocol.Formatters.MessageBodyFormatters
             JT809_0x1001 jT809_0X1001 = new JT809_0x1001();
             jT809_0X1001.UserId = reader.ReadUInt32();
             jT809_0X1001.Password = reader.ReadString(8);
+            jT809_0X1001.MsgGNSSCENTERID = reader.ReadUInt32();
             jT809_0X1001.DownLinkIP = reader.ReadString(32);
             jT809_0X1001.DownLinkPort = reader.ReadUInt16();
             return jT809_0X1001;
@@ -27,6 +28,7 @@ namespace JT809.Protocol.Formatters.MessageBodyFormatters
         {
             writer.WriteUInt32(value.UserId);
             writer.WriteStringPadRight(value.Password, 8);
+            writer.WriteUInt32(value.MsgGNSSCENTERID);
             writer.WriteStringPadRight(value.DownLinkIP, 32);
             writer.WriteUInt16(value.DownLinkPort);
         }
diff --git a/src/JT809.Protocol/MessageBody/JT809_0x1001.cs b/src/JT809.Protocol/MessageBody/JT809_0x1001.cs
index 326d863..d728205 100644
--- a/src/JT809.Protocol/MessageBody/JT809_0x1001.cs
+++ b/src/JT809.Protocol/MessageBody/JT809_0x1001.cs
@@ -26,6 +26,10 @@ namespace JT809.Protocol.MessageBody
         /// </summary>
         public string Password { get; set; }
         /// <summary>
+        /// 下级平台接入码
+        /// </summary>
+        public uint MsgGNSSCENTERID { get; set; }
+        /// <summary>
         /// 下级平台提供对应的从链路服务端 IP 地址
         /// 32位
         /// </summary>