diff --git a/app/src/main/java/com/shuwei/intelligent/shelves/serial/ScaleManager.kt b/app/src/main/java/com/shuwei/intelligent/shelves/serial/ScaleManager.kt
index 7e2b240..ec8cb74 100644
--- a/app/src/main/java/com/shuwei/intelligent/shelves/serial/ScaleManager.kt
+++ b/app/src/main/java/com/shuwei/intelligent/shelves/serial/ScaleManager.kt
@@ -20,6 +20,7 @@ import io.github.jeadyx.jserialport.SerialPortFactory
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.cancel
+import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
@@ -73,6 +74,9 @@ object ScaleManager {
     private var serialPort: AndroidSerialPort? = null
     private var scope = CoroutineScope(Dispatchers.IO)
 
+    /** 发送队列：保证串口写入顺序，避免并发写冲突 */
+    private val sendChannel = Channel<String>(capacity = Channel.UNLIMITED)
+
     /** 当前设备激活码，非空时收到激活请求自动应答 */
     private var activateCode: String = ""
 
@@ -141,6 +145,17 @@ object ScaleManager {
                     parity = SerialPort.PARITY_NONE
                 )
             } as AndroidSerialPort?
+            // 启动单一消费者协程，顺序消费发送队列
+            scope.launch {
+                for (hexStr in sendChannel) {
+                    try {
+                        serialPort?.write(hexStr.hexToBytes())
+                    } catch (e: Exception) {
+                        e.printStackTrace()
+                        log("发送命令失败: ${e.message}")
+                    }
+                }
+            }
             true
         } catch (e: Exception) {
             e.printStackTrace()
@@ -301,7 +316,7 @@ object ScaleManager {
     // ----------------------------------------------------------------
 
     /**
-     * 发送十六进制字符串指令（需先调用 init() 注入发送函数）
+     * 发送十六进制字符串指令，指令进入发送队列按顺序写入串口
      *
      * @param hexStr 完整帧十六进制字符串，含协议头尾
      */
@@ -310,14 +325,7 @@ object ScaleManager {
             log("警告：ScaleManager 串口未打开或已释放")
             return
         }
-        scope.launch {
-            try {
-                serialPort?.write(hexStr.hexToBytes())
-            } catch (e: Exception) {
-                e.printStackTrace()
-                log("发送命令失败: ${e.message}")
-            }
-        }
+        sendChannel.trySend(hexStr)
     }
 
     // ----------------------------------------------------------------
@@ -423,6 +431,7 @@ object ScaleManager {
      * 通常在 Activity/Fragment 销毁或不再使用时调用
      */
     suspend fun release() {
+        sendChannel.close()
         scope.cancel()
         serialPort?.close()
         serialPort = null