diff --git a/jsowell-netty/src/main/java/com/jsowell/netty/domain/ebike/serversend/EBikeMessageCmd81.java b/jsowell-netty/src/main/java/com/jsowell/netty/domain/ebike/serversend/EBikeMessageCmd81.java
new file mode 100644
index 000000000..aa153cfb9
--- /dev/null
+++ b/jsowell-netty/src/main/java/com/jsowell/netty/domain/ebike/serversend/EBikeMessageCmd81.java
@@ -0,0 +1,21 @@
+package com.jsowell.netty.domain.ebike.serversend;
+
+import com.jsowell.netty.domain.ebike.AbsEBikeMessage;
+
+/**
+ * 查询设备联网状态（81指令）
+ * 注1、此命令应用于注册网络后，通信过程中，服务器主动查询设备状态
+ * 注2、此命令会触发设备发送“注册包”20、“设备心跳包”01和21指令（上发时间会因设备不同而不同）
+ */
+public class EBikeMessageCmd81 extends AbsEBikeMessage {
+
+    public EBikeMessageCmd81(String header, int length, int physicalId, int messageId, String command, Object payload, int checksum) {
+        super(header, length, physicalId, messageId, command, payload, checksum);
+    }
+
+    @Override
+    public void parsePayload(byte[] dataBytes) {
+
+    }
+
+}
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