diff --git a/src/message_handler.cpp b/src/message_handler.cpp
index bf84d7f..1c59b4a 100644
--- a/src/message_handler.cpp
+++ b/src/message_handler.cpp
@@ -1,35 +1,12 @@
 #include <iostream>
 #include <thread>
 #include <boost/asio.hpp>
-#include <boost/asio/steady_timer.hpp>
 
 #include "tcp_client.hpp"
 #include "tcp_service.hpp"
 #include "serial_port_wrapper.hpp"
 
 int main() {
-    // 启动甲烷数据查询串口线程，定时发送查询指令
-    std::thread gas_serial_port_thread([] {
-        try {
-            boost::asio::io_service io;
-            //打开串口
-            SerialPortWrapper wrapper(io, "/dev/ttyUSB0", 115200); //甲烷串口
-
-            // 从串口读取数据
-            boost::asio::streambuf buffer;
-            wrapper.read_from_port(buffer);
-
-            // TODO 暂时不考虑写数据到串口
-            // steady_timer timer(io, std::chrono::seconds(3));
-            // wrapper.start_periodic_send();
-
-            io.run();
-        } catch (std::exception &e) {
-            std::cerr << e.what() << std::endl;
-        }
-    });
-    gas_serial_port_thread.join();
-
     // 启动TCP客户端，接收来自Web端的命令，控制机器狗运动
     std::thread client_thread([] {
         TcpClient client("eth0");
@@ -44,5 +21,23 @@
         service.start(8888);
     });
     service_thread.join();
+
+    // 启动甲烷数据查询串口线程，定时发送查询指令
+    std::thread gas_serial_port_thread([] {
+        try {
+            boost::asio::io_service io;
+            //打开串口
+            SerialPortWrapper wrapper(io, "/dev/ttyUSB0", 115200); //甲烷串口
+
+            // 从串口读取数据
+            boost::asio::streambuf buffer;
+            wrapper.read_from_port(buffer);
+
+            io.run();
+        } catch (std::exception &e) {
+            std::cerr << e.what() << std::endl;
+        }
+    });
+    gas_serial_port_thread.join();
     return 0;
 }

diff --git a/src/message_handler.cpp b/src/message_handler.cpp
index bf84d7f..1c59b4a 100644
--- a/src/message_handler.cpp
+++ b/src/message_handler.cpp
@@ -1,35 +1,12 @@
 #include <iostream>
 #include <thread>
 #include <boost/asio.hpp>
-#include <boost/asio/steady_timer.hpp>
 
 #include "tcp_client.hpp"
 #include "tcp_service.hpp"
 #include "serial_port_wrapper.hpp"
 
 int main() {
-    // 启动甲烷数据查询串口线程，定时发送查询指令
-    std::thread gas_serial_port_thread([] {
-        try {
-            boost::asio::io_service io;
-            //打开串口
-            SerialPortWrapper wrapper(io, "/dev/ttyUSB0", 115200); //甲烷串口
-
-            // 从串口读取数据
-            boost::asio::streambuf buffer;
-            wrapper.read_from_port(buffer);
-
-            // TODO 暂时不考虑写数据到串口
-            // steady_timer timer(io, std::chrono::seconds(3));
-            // wrapper.start_periodic_send();
-
-            io.run();
-        } catch (std::exception &e) {
-            std::cerr << e.what() << std::endl;
-        }
-    });
-    gas_serial_port_thread.join();
-
     // 启动TCP客户端，接收来自Web端的命令，控制机器狗运动
     std::thread client_thread([] {
         TcpClient client("eth0");
@@ -44,5 +21,23 @@
         service.start(8888);
     });
     service_thread.join();
+
+    // 启动甲烷数据查询串口线程，定时发送查询指令
+    std::thread gas_serial_port_thread([] {
+        try {
+            boost::asio::io_service io;
+            //打开串口
+            SerialPortWrapper wrapper(io, "/dev/ttyUSB0", 115200); //甲烷串口
+
+            // 从串口读取数据
+            boost::asio::streambuf buffer;
+            wrapper.read_from_port(buffer);
+
+            io.run();
+        } catch (std::exception &e) {
+            std::cerr << e.what() << std::endl;
+        }
+    });
+    gas_serial_port_thread.join();
     return 0;
 }
diff --git a/src/serial_port_wrapper.cpp b/src/serial_port_wrapper.cpp
index 79d52e9..fbb54c5 100644
--- a/src/serial_port_wrapper.cpp
+++ b/src/serial_port_wrapper.cpp
@@ -6,6 +6,16 @@
 #include <iomanip>
 #include <iostream>
 
+void handle_data(const std::vector<uint8_t> &buffer) {
+    const auto x = buffer[2] & 0xFFFF;
+    const auto y = buffer[3] & 0xFFF;
+    const auto z = buffer[4] & 0xFF;
+    const auto w = buffer[5];
+    const auto result = x + y + z + w;
+    std::cout << "methane concentration: " << result << " ppm·m" << std::endl;
+    //http上传数据
+}
+
 SerialPortWrapper::SerialPortWrapper(
     boost::asio::io_service &io_service, const std::string &port_name, const int baud_rate
 ): io_service_(io_service), port_(io_service, port_name), timer_(io_service, std::chrono::seconds(3)) {
@@ -15,18 +25,10 @@
     port_.set_option(serial_port_base::stop_bits(serial_port_base::stop_bits::one));
 }
 
-void SerialPortWrapper::handle_data(const std::vector<uint8_t> &buffer) {
-    const auto x = buffer[2] & 0xFF;
-    const auto y = buffer[3] & 0xFF;
-    const auto z = buffer[4] & 0xFF;
-    const auto result = x * 65536 + y * 256 + z;
-    std::cout << "methane concentration: " << result << " ppm" << std::endl;
-    //http上传数据
-}
-
+//CC 05 00 00 00 00 0D 77
 void SerialPortWrapper::read_from_port(boost::asio::streambuf &buffer) {
     async_read_until(
-        port_, buffer, static_cast<char>(0x96), //结束位，一定要注意匹配
+        port_, buffer, 0x77, //结束位，一定要匹配
         [this,&buffer](const boost::system::error_code &error, const size_t bytes_transferred) {
             if (!error) {
                 // 获取接收到的数据
@@ -56,33 +58,4 @@
             }
         }
     );
-}
-
-void SerialPortWrapper::write_to_port(std::vector<uint8_t> command) {
-    const size_t bytes_to_send = command.size();
-    if (bytes_to_send == 0) {
-        std::cout << "Empty command, nothing to send." << std::endl;
-        return;
-    }
-
-    try {
-        const size_t bytes_sent = boost::asio::write(port_, boost::asio::buffer(command));
-        if (bytes_sent == bytes_to_send) {
-            std::cout << "sent successfully" << std::endl;
-        } else {
-            std::cerr << "only " << bytes_sent << " bytes sent out of " << bytes_to_send << std::endl;
-        }
-    } catch (const boost::system::system_error &e) {
-        std::cerr << "error sending data: " << e.what() << std::endl;
-    }
-}
-
-void SerialPortWrapper::start_periodic_send() {
-    timer_.async_wait([this](const boost::system::error_code &error) {
-        if (!error) {
-            write_to_port(query_methane_command);
-            timer_.expires_at(timer_.expiry() + std::chrono::seconds(3));
-            start_periodic_send();
-        }
-    });
-}
+}
\ No newline at end of file

diff --git a/src/message_handler.cpp b/src/message_handler.cpp
index bf84d7f..1c59b4a 100644
--- a/src/message_handler.cpp
+++ b/src/message_handler.cpp
@@ -1,35 +1,12 @@
 #include <iostream>
 #include <thread>
 #include <boost/asio.hpp>
-#include <boost/asio/steady_timer.hpp>
 
 #include "tcp_client.hpp"
 #include "tcp_service.hpp"
 #include "serial_port_wrapper.hpp"
 
 int main() {
-    // 启动甲烷数据查询串口线程，定时发送查询指令
-    std::thread gas_serial_port_thread([] {
-        try {
-            boost::asio::io_service io;
-            //打开串口
-            SerialPortWrapper wrapper(io, "/dev/ttyUSB0", 115200); //甲烷串口
-
-            // 从串口读取数据
-            boost::asio::streambuf buffer;
-            wrapper.read_from_port(buffer);
-
-            // TODO 暂时不考虑写数据到串口
-            // steady_timer timer(io, std::chrono::seconds(3));
-            // wrapper.start_periodic_send();
-
-            io.run();
-        } catch (std::exception &e) {
-            std::cerr << e.what() << std::endl;
-        }
-    });
-    gas_serial_port_thread.join();
-
     // 启动TCP客户端，接收来自Web端的命令，控制机器狗运动
     std::thread client_thread([] {
         TcpClient client("eth0");
@@ -44,5 +21,23 @@
         service.start(8888);
     });
     service_thread.join();
+
+    // 启动甲烷数据查询串口线程，定时发送查询指令
+    std::thread gas_serial_port_thread([] {
+        try {
+            boost::asio::io_service io;
+            //打开串口
+            SerialPortWrapper wrapper(io, "/dev/ttyUSB0", 115200); //甲烷串口
+
+            // 从串口读取数据
+            boost::asio::streambuf buffer;
+            wrapper.read_from_port(buffer);
+
+            io.run();
+        } catch (std::exception &e) {
+            std::cerr << e.what() << std::endl;
+        }
+    });
+    gas_serial_port_thread.join();
     return 0;
 }
diff --git a/src/serial_port_wrapper.cpp b/src/serial_port_wrapper.cpp
index 79d52e9..fbb54c5 100644
--- a/src/serial_port_wrapper.cpp
+++ b/src/serial_port_wrapper.cpp
@@ -6,6 +6,16 @@
 #include <iomanip>
 #include <iostream>
 
+void handle_data(const std::vector<uint8_t> &buffer) {
+    const auto x = buffer[2] & 0xFFFF;
+    const auto y = buffer[3] & 0xFFF;
+    const auto z = buffer[4] & 0xFF;
+    const auto w = buffer[5];
+    const auto result = x + y + z + w;
+    std::cout << "methane concentration: " << result << " ppm·m" << std::endl;
+    //http上传数据
+}
+
 SerialPortWrapper::SerialPortWrapper(
     boost::asio::io_service &io_service, const std::string &port_name, const int baud_rate
 ): io_service_(io_service), port_(io_service, port_name), timer_(io_service, std::chrono::seconds(3)) {
@@ -15,18 +25,10 @@
     port_.set_option(serial_port_base::stop_bits(serial_port_base::stop_bits::one));
 }
 
-void SerialPortWrapper::handle_data(const std::vector<uint8_t> &buffer) {
-    const auto x = buffer[2] & 0xFF;
-    const auto y = buffer[3] & 0xFF;
-    const auto z = buffer[4] & 0xFF;
-    const auto result = x * 65536 + y * 256 + z;
-    std::cout << "methane concentration: " << result << " ppm" << std::endl;
-    //http上传数据
-}
-
+//CC 05 00 00 00 00 0D 77
 void SerialPortWrapper::read_from_port(boost::asio::streambuf &buffer) {
     async_read_until(
-        port_, buffer, static_cast<char>(0x96), //结束位，一定要注意匹配
+        port_, buffer, 0x77, //结束位，一定要匹配
         [this,&buffer](const boost::system::error_code &error, const size_t bytes_transferred) {
             if (!error) {
                 // 获取接收到的数据
@@ -56,33 +58,4 @@
             }
         }
     );
-}
-
-void SerialPortWrapper::write_to_port(std::vector<uint8_t> command) {
-    const size_t bytes_to_send = command.size();
-    if (bytes_to_send == 0) {
-        std::cout << "Empty command, nothing to send." << std::endl;
-        return;
-    }
-
-    try {
-        const size_t bytes_sent = boost::asio::write(port_, boost::asio::buffer(command));
-        if (bytes_sent == bytes_to_send) {
-            std::cout << "sent successfully" << std::endl;
-        } else {
-            std::cerr << "only " << bytes_sent << " bytes sent out of " << bytes_to_send << std::endl;
-        }
-    } catch (const boost::system::system_error &e) {
-        std::cerr << "error sending data: " << e.what() << std::endl;
-    }
-}
-
-void SerialPortWrapper::start_periodic_send() {
-    timer_.async_wait([this](const boost::system::error_code &error) {
-        if (!error) {
-            write_to_port(query_methane_command);
-            timer_.expires_at(timer_.expiry() + std::chrono::seconds(3));
-            start_periodic_send();
-        }
-    });
-}
+}
\ No newline at end of file
diff --git a/src/serial_port_wrapper.hpp b/src/serial_port_wrapper.hpp
index db9dbef..04591db 100644
--- a/src/serial_port_wrapper.hpp
+++ b/src/serial_port_wrapper.hpp
@@ -19,18 +19,10 @@
 
     void read_from_port(boost::asio::streambuf &buffer);
 
-    void write_to_port(std::vector<uint8_t> command);
-
-    void start_periodic_send();
-
 private:
-    // 查询甲烷的指令
-    std::vector<uint8_t> query_methane_command = {0xAA, 0x01, 0x00, 0x95, 0x00, 0x00, 0x96};
     boost::asio::io_service &io_service_;
     boost::asio::serial_port port_;
     steady_timer timer_;
-
-    void handle_data(const std::vector<uint8_t> &buffer);
 };
 
 #endif //SERIAL_PORT_WRAPPER_HPP