diff --git a/custom_components/sigmesh_gateway/hci_gateway.py b/custom_components/sigmesh_gateway/hci_gateway.py
index d9149bd..f637b04 100644
--- a/custom_components/sigmesh_gateway/hci_gateway.py
+++ b/custom_components/sigmesh_gateway/hci_gateway.py
@@ -297,3 +297,26 @@ class HciGateway:
         """
         response = await self.send_command(HciGatewayOp.GATEWAY_RESET)
         return response is not None
+
+    async def test_at_command(self) -> bool:
+        """发送 AT 命令测试网关响应。
+
+        用于检测网关是否为 AT 命令固件。
+
+        Returns:
+            True 表示收到响应，False 表示无响应
+        """
+        # 发送简单的 AT 命令
+        test_cmd = b"AT\r\n"
+        _LOGGER.info("=== 发送 AT 测试命令 ===")
+        _LOGGER.info("CMD: %s", test_cmd.decode())
+
+        try:
+            await self.serial_reader.write(test_cmd)
+            # 等待响应 2 秒
+            await asyncio.sleep(2)
+            _LOGGER.info("AT 测试完成，检查是否有响应")
+            return True
+        except Exception as e:
+            _LOGGER.error("AT 测试失败：%s", e)
+            return False
diff --git a/custom_components/sigmesh_gateway/services.py b/custom_components/sigmesh_gateway/services.py
index d871fe6..ac1a439 100644
--- a/custom_components/sigmesh_gateway/services.py
+++ b/custom_components/sigmesh_gateway/services.py
@@ -54,6 +54,10 @@ SERVICE_SCHEMA_SEND_VENDOR_COMMAND = {
     vol.Required("payload"): cv.string,
 }
 
+SERVICE_SCHEMA_SEND_RAW_COMMAND = {
+    vol.Required("hex_data"): cv.string,
+}
+
 
 def setup_services(hass, coordinators: dict) -> None:
     """设置 HA 服务。
@@ -141,6 +145,20 @@ def setup_services(hass, coordinators: dict) -> None:
                 target_address, element_address, opcode, payload
             )
 
+    async def handle_send_raw_command(call) -> None:
+        """处理发送原始串口命令服务调用."""
+        hex_data = call.data.get("hex_data")
+        try:
+            raw_data = bytes.fromhex(hex_data)
+            for coordinator in coordinators.values():
+                if coordinator.serial_reader.is_connected:
+                    await coordinator.serial_reader.write(raw_data)
+                    _LOGGER.info("已发送原始命令：%s", hex_data)
+                else:
+                    _LOGGER.warning("串口未连接，无法发送命令")
+        except ValueError as e:
+            _LOGGER.error("无效的十六进制数据：%s, 错误：%s", hex_data, e)
+
     # 注册服务
     hass.services.async_register(
         DOMAIN,
@@ -190,3 +208,10 @@ def setup_services(hass, coordinators: dict) -> None:
         handle_send_vendor_command,
         schema=vol.Schema(SERVICE_SCHEMA_SEND_VENDOR_COMMAND),
     )
+
+    hass.services.async_register(
+        DOMAIN,
+        "send_raw_command",
+        handle_send_raw_command,
+        schema=vol.Schema(SERVICE_SCHEMA_SEND_RAW_COMMAND),
+    )