diff --git a/app/src/main/java/com/casic/common/detector/gd/service/SerialPortService.kt b/app/src/main/java/com/casic/common/detector/gd/service/SerialPortService.kt
index 24083d9..3511a01 100644
--- a/app/src/main/java/com/casic/common/detector/gd/service/SerialPortService.kt
+++ b/app/src/main/java/com/casic/common/detector/gd/service/SerialPortService.kt
@@ -32,10 +32,13 @@
     private val gpioState = AtomicInteger(0)
 
     fun openSerialPort(commandArray: ArrayList<Char>, listener: OnSerialPortListener) {
-        //调高串口电位
-        gpioManager.setGpioHigh("18")
-        gpioState.set(1)
-        Log.d(kTag, "openSerialPort: 调高串口电位")
+        if (gpioState.get() != 1) {
+            gpioManager.setGpioHigh("18")
+            gpioState.set(1)
+            Log.d(kTag, "openSerialPort: 调高串口电位")
+        } else {
+            Log.d(kTag, "openSerialPort: 已经是高电位，直接读数据")
+        }
 
         try {
             outStream = serialPorts.first().outputStream
@@ -81,15 +84,14 @@
     }
 
     fun closeSerialPort() {
+        if (gpioState.get() == 0) {
+            Log.d(kTag, "closeSerialPort: 已经是低电位，直接返回")
+            return
+        }
         // 降低串口电位
         gpioManager.setGpioLow("18")
         gpioState.set(0)
         Log.d(kTag, "closeSerialPort: 降低串口电位")
-
-        executor.shutdownNow()
-        outStream?.close()
-        inStreamFirst?.close()
-        inStreamLast?.close()
     }