diff --git a/src/handlers.py b/src/handlers.py
index 5710b82..c451044 100644
--- a/src/handlers.py
+++ b/src/handlers.py
@@ -345,6 +345,7 @@ SERIALNET_TIMEOUT = 10  # 秒
 async def serialnet_loop():
     """后台轮询：检查 tb_serialnet 待发送指令，通过 UDP 下发
 
+    直接查询 tb_serialnet 表（不依赖 _registry），
     1. state=0 → 发送 SerialNet JSON → state=1
     2. state=1 且超过 10 秒 → state=3 (超时失败)
     """
@@ -353,14 +354,11 @@ async def serialnet_loop():
 
     while True:
         try:
-            for device_id, dnt_id in list(_registry.items()):
-                # 1. 下发待发送指令
-                pending = await get_pending_serialnet(dnt_id)
-                if pending:
-                    await _send_serialnet_cmd(device_id, dnt_id, pending)
+            # 1. 查询所有 state=0 的记录
+            await _process_pending_all()
 
-                # 2. 超时检测
-                await _check_serialnet_timeout(dnt_id)
+            # 2. 查询所有 state=1 超时的记录
+            await _check_timeout_all()
 
         except Exception as e:
             logger.error(f"透传轮询异常: {e}")
@@ -368,6 +366,49 @@ async def serialnet_loop():
         await asyncio.sleep(0.2)
 
 
+async def _process_pending_all():
+    """查询所有 state=0 的记录并发送"""
+    from src.models import get_pool
+    import aiomysql
+    pool = await get_pool()
+    async with pool.acquire() as conn:
+        async with conn.cursor(aiomysql.DictCursor) as cur:
+            await cur.execute(
+                "SELECT sn.*, d.serial, d.ip FROM tb_serialnet sn "
+                "JOIN dnt_info d ON sn.dnt_id = d.id "
+                "WHERE sn.state = 0 ORDER BY sn.id ASC LIMIT 10"
+            )
+            rows = await cur.fetchall()
+
+    for row in rows:
+        device_id = row["serial"]
+        dnt_id = row["dnt_id"]
+        if not row.get("ip"):
+            logger.warning(f"设备 {device_id} 无 IP，跳过")
+            await mark_serialnet_timeout(row["id"])
+            continue
+        await _send_serialnet_cmd(device_id, dnt_id, row)
+
+
+async def _check_timeout_all():
+    """检查所有 state=1 超时记录"""
+    from src.models import get_pool
+    import aiomysql
+    pool = await get_pool()
+    async with pool.acquire() as conn:
+        async with conn.cursor(aiomysql.DictCursor) as cur:
+            await cur.execute(
+                "SELECT id, dnt_id FROM tb_serialnet WHERE state=1 "
+                "AND update_time < DATE_SUB(NOW(), INTERVAL %s SECOND) "
+                "LIMIT 20",
+                (SERIALNET_TIMEOUT,),
+            )
+            rows = await cur.fetchall()
+    for row in rows:
+        await mark_serialnet_timeout(row["id"])
+        logger.warning(f"tb_serialnet #{row['id']} 超时 dnt_id={row['dnt_id']}")
+
+
 async def _send_serialnet_cmd(device_id: str, dnt_id: int, record: dict):
     """构造 SerialNet JSON 并通过 UDP 发送给设备"""
     if _udp_sender is None:
@@ -398,22 +439,3 @@ async def _send_serialnet_cmd(device_id: str, dnt_id: int, record: dict):
     _udp_sender(msg_bytes, addr)
     await mark_serialnet_sent(record["id"])
     logger.info(f"已发送 SerialNet → {device_id} ({addr}): {send_pkg}")
-
-
-async def _check_serialnet_timeout(dnt_id: int):
-    """检查 state=1 超时记录"""
-    from src.models import get_pool
-    import aiomysql
-    pool = await get_pool()
-    async with pool.acquire() as conn:
-        async with conn.cursor(aiomysql.DictCursor) as cur:
-            await cur.execute(
-                "SELECT id FROM tb_serialnet WHERE dnt_id=%s AND state=1 "
-                "AND update_time < DATE_SUB(NOW(), INTERVAL %s SECOND) "
-                "LIMIT 5",
-                (dnt_id, SERIALNET_TIMEOUT),
-            )
-            rows = await cur.fetchall()
-    for row in rows:
-        await mark_serialnet_timeout(row["id"])
-        logger.warning(f"tb_serialnet #{row['id']} 超时 (>{SERIALNET_TIMEOUT}s)")
diff --git a/src/server.py b/src/server.py
index 3b5953a..7ad6779 100644
--- a/src/server.py
+++ b/src/server.py
@@ -70,6 +70,7 @@ class EDCProtocol:
         msg = parse_message(data)
         if msg is None:
             return
+        logger.info(f"UDP {msg} from {addr}")
 
         method = msg.get("Method", "")
         logger.debug(f"UDP {method} from {addr}")
@@ -108,6 +109,7 @@ async def handle_tcp_client(reader: asyncio.StreamReader,
 
     async def process_message(msg: dict):
         """处理单条消息并返回响应文本"""
+        logger.info(f"TCP get_rcv {msg} from {addr}") 
         method = msg.get("Method", "")
         logger.debug(f"TCP {method} from {addr}")