diff --git a/APP/inc/rtconfig.h b/APP/inc/rtconfig.h
index 141a1df..7c5cf5c 100644
--- a/APP/inc/rtconfig.h
+++ b/APP/inc/rtconfig.h
@@ -35,7 +35,7 @@
 #define RT_USING_SEMAPHORE
 
 /* Using Mutex */
-//#define RT_USING_MUTEX
+#define RT_USING_MUTEX
 
 /* Using Event */
 //#define RT_USING_EVENT
diff --git a/APP/src/app_task.c b/APP/src/app_task.c
index 5d3a8f9..9ccf346 100644
--- a/APP/src/app_task.c
+++ b/APP/src/app_task.c
@@ -49,15 +49,15 @@ void thread_entry_SysMonitor(void* parameter)
 		usModbusUserData[0] = (USHORT)(rt_tick_get()/10);
 		usModbusUserData[1] = (USHORT)(rt_tick_get()%10);
 		ucModbusUserData[0] = 0x1F;
-		eMBMasterReqReadDiscreteInputs(1,3,8);
-//		eMBMasterReqWriteMultipleCoils(1,3,5,ucModbusUserData);
-//		eMBMasterReqWriteCoil(1,8,0xFF00);
-//		eMBMasterReqReadCoils(1,3,8);
-//		eMBMasterReqReadInputRegister(1,3,2);
-//		eMBMasterReqWriteHoldingRegister(1,3,usModbusUserData[0]);
-//		eMBMasterReqWriteMultipleHoldingRegister(1,3,2,usModbusUserData);
-//		eMBMasterReqReadHoldingRegister(1,3,2);
-//		eMBMasterReqReadWriteMultipleHoldingRegister(1,3,2,usModbusUserData,5,2);
+		eMBMasterReqReadDiscreteInputs(1,3,8,MB_WAITING_FOREVER);
+//		eMBMasterReqWriteMultipleCoils(1,3,5,ucModbusUserData,MB_WAITING_FOREVER);
+//		eMBMasterReqWriteCoil(1,8,0xFF00,MB_WAITING_FOREVER);
+//		eMBMasterReqReadCoils(1,3,8,MB_WAITING_FOREVER);
+//		eMBMasterReqReadInputRegister(1,3,2,MB_WAITING_FOREVER);
+//		eMBMasterReqWriteHoldingRegister(1,3,usModbusUserData[0],MB_WAITING_FOREVER);
+//		eMBMasterReqWriteMultipleHoldingRegister(1,3,2,usModbusUserData,MB_WAITING_FOREVER);
+//		eMBMasterReqReadHoldingRegister(1,3,2,MB_WAITING_FOREVER);
+//		eMBMasterReqReadWriteMultipleHoldingRegister(1,3,2,usModbusUserData,5,2,MB_WAITING_FOREVER);
 	}
 }
 
diff --git a/FreeModbus/modbus/functions/mbfunccoils_m.c b/FreeModbus/modbus/functions/mbfunccoils_m.c
index a89dbf1..4d7dd38 100644
--- a/FreeModbus/modbus/functions/mbfunccoils_m.c
+++ b/FreeModbus/modbus/functions/mbfunccoils_m.c
@@ -75,12 +75,12 @@ eMBException    prveMBError2Exception( eMBErrorCode eErrorCode );
 #if MB_FUNC_READ_COILS_ENABLED > 0
 
 eMBMasterReqErrCode
-eMBMasterReqReadCoils( UCHAR ucSndAddr, USHORT usCoilAddr, USHORT usNCoils )
+eMBMasterReqReadCoils( UCHAR ucSndAddr, USHORT usCoilAddr, USHORT usNCoils ,LONG lTimeOut )
 {
     UCHAR                 *ucMBFrame;
     eMBMasterReqErrCode    eErrStatus = MB_MRE_NO_ERR;
 
-    if ( xMBMasterGetIsBusy() ) eErrStatus = MB_MRE_MASTER_BUSY;
+    if ( xMBasterRunMutexLock( lTimeOut ) == FALSE ) eErrStatus = MB_MRE_MASTER_BUSY;
     else if ( ucSndAddr > MB_MASTER_TOTAL_SLAVE_NUM ) eErrStatus = MB_MRE_ILL_ARG;
     else
     {
@@ -162,12 +162,12 @@ eMBMasterFuncReadCoils( UCHAR * pucFrame, USHORT * usLen )
 #if MB_FUNC_WRITE_COIL_ENABLED > 0
 
 eMBMasterReqErrCode
-eMBMasterReqWriteCoil( UCHAR ucSndAddr, USHORT usCoilAddr, USHORT usCoilData )
+eMBMasterReqWriteCoil( UCHAR ucSndAddr, USHORT usCoilAddr, USHORT usCoilData, LONG lTimeOut )
 {
     UCHAR                 *ucMBFrame;
     eMBMasterReqErrCode    eErrStatus = MB_MRE_NO_ERR;
 
-    if ( xMBMasterGetIsBusy() ) eErrStatus = MB_MRE_MASTER_BUSY;
+    if ( xMBasterRunMutexLock( lTimeOut ) == FALSE ) eErrStatus = MB_MRE_MASTER_BUSY;
     else if ( usCoilAddr > MB_MASTER_TOTAL_SLAVE_NUM ) eErrStatus = MB_MRE_ILL_ARG;
     else if ( ( usCoilData != 0xFF00 ) && ( usCoilData != 0x0000 ) ) eErrStatus = MB_MRE_ILL_ARG;
     else
@@ -242,14 +242,14 @@ eMBMasterFuncWriteCoil( UCHAR * pucFrame, USHORT * usLen )
 
 eMBMasterReqErrCode
 eMBMasterReqWriteMultipleCoils( UCHAR ucSndAddr,
-		USHORT usCoilAddr, USHORT usNCoils, UCHAR * pucDataBuffer )
+		USHORT usCoilAddr, USHORT usNCoils, UCHAR * pucDataBuffer, LONG lTimeOut)
 {
     UCHAR                 *ucMBFrame;
     USHORT                 usRegIndex = 0;
     UCHAR                  ucByteCount;
     eMBMasterReqErrCode    eErrStatus = MB_MRE_NO_ERR;
 
-    if ( xMBMasterGetIsBusy() ) eErrStatus = MB_MRE_MASTER_BUSY;
+    if ( xMBasterRunMutexLock( lTimeOut ) == FALSE ) eErrStatus = MB_MRE_MASTER_BUSY;
     else if ( ucSndAddr > MB_MASTER_TOTAL_SLAVE_NUM ) eErrStatus = MB_MRE_ILL_ARG;
     else if ( usNCoils > MB_PDU_REQ_WRITE_MUL_COILCNT_MAX ) eErrStatus = MB_MRE_ILL_ARG;
     else
diff --git a/FreeModbus/modbus/functions/mbfuncdisc_m.c b/FreeModbus/modbus/functions/mbfuncdisc_m.c
index a177434..1614858 100644
--- a/FreeModbus/modbus/functions/mbfuncdisc_m.c
+++ b/FreeModbus/modbus/functions/mbfuncdisc_m.c
@@ -60,12 +60,12 @@ eMBException    prveMBError2Exception( eMBErrorCode eErrorCode );
 #if MB_FUNC_READ_DISCRETE_INPUTS_ENABLED > 0
 
 eMBMasterReqErrCode
-eMBMasterReqReadDiscreteInputs( UCHAR ucSndAddr, USHORT usDiscreteAddr, USHORT usNDiscreteIn )
+eMBMasterReqReadDiscreteInputs( UCHAR ucSndAddr, USHORT usDiscreteAddr, USHORT usNDiscreteIn, LONG lTimeOut )
 {
     UCHAR                 *ucMBFrame;
     eMBMasterReqErrCode    eErrStatus = MB_MRE_NO_ERR;
 
-    if ( xMBMasterGetIsBusy() ) eErrStatus = MB_MRE_MASTER_BUSY;
+    if ( xMBasterRunMutexLock( lTimeOut ) == FALSE ) eErrStatus = MB_MRE_MASTER_BUSY;
     else if ( ucSndAddr > MB_MASTER_TOTAL_SLAVE_NUM ) eErrStatus = MB_MRE_ILL_ARG;
     else
     {
diff --git a/FreeModbus/modbus/functions/mbfuncholding_m.c b/FreeModbus/modbus/functions/mbfuncholding_m.c
index 7fd5378..cce53c0 100644
--- a/FreeModbus/modbus/functions/mbfuncholding_m.c
+++ b/FreeModbus/modbus/functions/mbfuncholding_m.c
@@ -87,12 +87,12 @@ eMBException    prveMBError2Exception( eMBErrorCode eErrorCode );
 #if MB_FUNC_WRITE_HOLDING_ENABLED > 0
 
 eMBMasterReqErrCode
-eMBMasterReqWriteHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usRegData )
+eMBMasterReqWriteHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usRegData, LONG lTimeOut )
 {
     UCHAR                 *ucMBFrame;
     eMBMasterReqErrCode    eErrStatus = MB_MRE_NO_ERR;
 
-    if ( xMBMasterGetIsBusy() ) eErrStatus = MB_MRE_MASTER_BUSY;
+    if ( xMBasterRunMutexLock( lTimeOut ) == FALSE ) eErrStatus = MB_MRE_MASTER_BUSY;
     else if ( ucSndAddr > MB_MASTER_TOTAL_SLAVE_NUM ) eErrStatus = MB_MRE_ILL_ARG;
     else
     {
@@ -145,13 +145,13 @@ eMBMasterFuncWriteHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
 
 eMBMasterReqErrCode
 eMBMasterReqWriteMultipleHoldingRegister( UCHAR ucSndAddr,
-		USHORT usRegAddr, USHORT usNRegs, USHORT * pusDataBuffer )
+		USHORT usRegAddr, USHORT usNRegs, USHORT * pusDataBuffer, LONG lTimeOut )
 {
     UCHAR                 *ucMBFrame;
     USHORT                 usRegIndex = 0;
     eMBMasterReqErrCode    eErrStatus = MB_MRE_NO_ERR;
 
-    if ( xMBMasterGetIsBusy() ) eErrStatus = MB_MRE_MASTER_BUSY;
+    if ( xMBasterRunMutexLock( lTimeOut ) == FALSE ) eErrStatus = MB_MRE_MASTER_BUSY;
     else if ( ucSndAddr > MB_MASTER_TOTAL_SLAVE_NUM ) eErrStatus = MB_MRE_ILL_ARG;
     else
     {
@@ -228,12 +228,12 @@ eMBMasterFuncWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
 #if MB_FUNC_READ_HOLDING_ENABLED > 0
 
 eMBMasterReqErrCode
-eMBMasterReqReadHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usNRegs )
+eMBMasterReqReadHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usNRegs, LONG lTimeOut )
 {
     UCHAR                 *ucMBFrame;
     eMBMasterReqErrCode    eErrStatus = MB_MRE_NO_ERR;
 
-    if ( xMBMasterGetIsBusy() ) eErrStatus = MB_MRE_MASTER_BUSY;
+    if ( xMBasterRunMutexLock( lTimeOut ) == FALSE ) eErrStatus = MB_MRE_MASTER_BUSY;
     else if ( ucSndAddr > MB_MASTER_TOTAL_SLAVE_NUM ) eErrStatus = MB_MRE_ILL_ARG;
     else
     {
@@ -303,13 +303,13 @@ eMBMasterFuncReadHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
 eMBMasterReqErrCode
 eMBMasterReqReadWriteMultipleHoldingRegister( UCHAR ucSndAddr,
 		USHORT usReadRegAddr, USHORT usNReadRegs, USHORT * pusDataBuffer,
-		USHORT usWriteRegAddr, USHORT usNWriteRegs )
+		USHORT usWriteRegAddr, USHORT usNWriteRegs, LONG lTimeOut )
 {
     UCHAR                 *ucMBFrame;
     USHORT                 usRegIndex = 0;
     eMBMasterReqErrCode    eErrStatus = MB_MRE_NO_ERR;
 
-    if ( xMBMasterGetIsBusy() ) eErrStatus = MB_MRE_MASTER_BUSY;
+    if ( xMBasterRunMutexLock( lTimeOut ) == FALSE ) eErrStatus = MB_MRE_MASTER_BUSY;
     else if ( ucSndAddr > MB_MASTER_TOTAL_SLAVE_NUM ) eErrStatus = MB_MRE_ILL_ARG;
     else
     {
diff --git a/FreeModbus/modbus/functions/mbfuncinput_m.c b/FreeModbus/modbus/functions/mbfuncinput_m.c
index c829b88..9574bd1 100644
--- a/FreeModbus/modbus/functions/mbfuncinput_m.c
+++ b/FreeModbus/modbus/functions/mbfuncinput_m.c
@@ -60,12 +60,12 @@ eMBException    prveMBError2Exception( eMBErrorCode eErrorCode );
 #if MB_FUNC_READ_INPUT_ENABLED > 0
 
 eMBMasterReqErrCode
-eMBMasterReqReadInputRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usNRegs )
+eMBMasterReqReadInputRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usNRegs, LONG lTimeOut )
 {
     UCHAR                 *ucMBFrame;
     eMBMasterReqErrCode    eErrStatus = MB_MRE_NO_ERR;
 
-    if ( xMBMasterGetIsBusy() ) eErrStatus = MB_MRE_MASTER_BUSY;
+    if ( xMBasterRunMutexLock( lTimeOut ) == FALSE ) eErrStatus = MB_MRE_MASTER_BUSY;
     else if ( ucSndAddr > MB_MASTER_TOTAL_SLAVE_NUM ) eErrStatus = MB_MRE_ILL_ARG;
     else
     {
diff --git a/FreeModbus/modbus/include/mb_m.h b/FreeModbus/modbus/include/mb_m.h
index 49efb7c..a4c93a4 100644
--- a/FreeModbus/modbus/include/mb_m.h
+++ b/FreeModbus/modbus/include/mb_m.h
@@ -338,26 +338,27 @@ eMBErrorCode eMBMasterRegDiscreteCB( UCHAR * pucRegBuffer, USHORT usAddress,
  *\brief These Modbus functions are called for user when Modbus run in Master Mode.
  */
 eMBMasterReqErrCode
-eMBMasterReqReadInputRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usNRegs );
+eMBMasterReqReadInputRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usNRegs, LONG lTimeOut );
 eMBMasterReqErrCode
-eMBMasterReqWriteHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usRegData );
+eMBMasterReqWriteHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usRegData, LONG lTimeOut );
 eMBMasterReqErrCode
-eMBMasterReqWriteMultipleHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usNRegs, USHORT * pusDataBuffer );
+eMBMasterReqWriteMultipleHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr,
+		USHORT usNRegs, USHORT * pusDataBuffer, LONG lTimeOut );
 eMBMasterReqErrCode
-eMBMasterReqReadHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usNRegs );
+eMBMasterReqReadHoldingRegister( UCHAR ucSndAddr, USHORT usRegAddr, USHORT usNRegs, LONG lTimeOut );
 eMBMasterReqErrCode
 eMBMasterReqReadWriteMultipleHoldingRegister( UCHAR ucSndAddr,
 		USHORT usReadRegAddr, USHORT usNReadRegs, USHORT * pusDataBuffer,
-		USHORT usWriteRegAddr, USHORT usNWriteRegs );
+		USHORT usWriteRegAddr, USHORT usNWriteRegs, LONG lTimeOut );
 eMBMasterReqErrCode
-eMBMasterReqReadCoils( UCHAR ucSndAddr, USHORT usCoilAddr, USHORT usNCoils );
+eMBMasterReqReadCoils( UCHAR ucSndAddr, USHORT usCoilAddr, USHORT usNCoils, LONG lTimeOut );
 eMBMasterReqErrCode
-eMBMasterReqWriteCoil( UCHAR ucSndAddr, USHORT usCoilAddr, USHORT usCoilData );
+eMBMasterReqWriteCoil( UCHAR ucSndAddr, USHORT usCoilAddr, USHORT usCoilData, LONG lTimeOut );
 eMBMasterReqErrCode
 eMBMasterReqWriteMultipleCoils( UCHAR ucSndAddr,
-		USHORT usCoilAddr, USHORT usNCoils, UCHAR * pucDataBuffer );
+		USHORT usCoilAddr, USHORT usNCoils, UCHAR * pucDataBuffer, LONG lTimeOut );
 eMBMasterReqErrCode
-eMBMasterReqReadDiscreteInputs( UCHAR ucSndAddr, USHORT usDiscreteAddr, USHORT usNDiscreteIn );
+eMBMasterReqReadDiscreteInputs( UCHAR ucSndAddr, USHORT usDiscreteAddr, USHORT usNDiscreteIn, LONG lTimeOut );
 
 eMBException
 eMBMasterFuncReportSlaveID( UCHAR * pucFrame, USHORT * usLen );
@@ -383,11 +384,9 @@ eMBMasterFuncReadWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen
 /*ŁĄ \ingroup modbus
  *\brief These functions are interface for Modbus Master
  */
-BOOL xMBMasterGetIsBusy( void );
 void vMBMasterGetPDUSndBuf( UCHAR ** pucFrame );
 UCHAR ucMBMasterGetDestAddress( void );
 void vMBMasterSetDestAddress( UCHAR Address );
-void vMBMasterSetIsBusy( BOOL IsBusy );
 BOOL xMBMasterGetCBRunInMasterMode( void );
 void vMBMasterSetCBRunInMasterMode( BOOL IsMasterMode );
 UCHAR ucMBMasterGetPDUSndLength( void );
diff --git a/FreeModbus/modbus/include/mbport.h b/FreeModbus/modbus/include/mbport.h
index a4c0a24..f065c88 100644
--- a/FreeModbus/modbus/include/mbport.h
+++ b/FreeModbus/modbus/include/mbport.h
@@ -36,6 +36,16 @@
 PR_BEGIN_EXTERN_C
 #endif
 
+/* ----------------------- Defines ------------------------------------------*/
+
+/*! \ingroup modbus
+ * \brief used for master mode.
+ *
+ * the mxMBasterRunMutexLock() parameter definitions
+ */
+#define MB_WAITING_FOREVER              -1              /*!< Block forever until get resource. */
+#define MB_WAITING_NO                   0               /*!< Non-block. */
+
 /* ----------------------- Type definitions ---------------------------------*/
 
 typedef enum
@@ -82,6 +92,12 @@ BOOL            xMBMasterPortEventPost( eMBMasterEventType eEvent );
 
 BOOL            xMBMasterPortEventGet(  /*@out@ */ eMBMasterEventType * eEvent );
 
+void            vMBasterRunMutexInit( void );
+
+BOOL            xMBasterRunMutexLock( int32_t time );
+
+void            vMBasterRunMutexUnlock( void );
+
 /* ----------------------- Serial port functions ----------------------------*/
 
 BOOL            xMBPortSerialInit( UCHAR ucPort, ULONG ulBaudRate,
@@ -97,7 +113,6 @@ INLINE BOOL     xMBPortSerialGetByte( CHAR * pucByte );
 
 INLINE BOOL     xMBPortSerialPutByte( CHAR ucByte );
 
-
 BOOL            xMBMasterPortSerialInit( UCHAR ucPort, ULONG ulBaudRate,
                                    UCHAR ucDataBits, eMBParity eParity );
 
diff --git a/FreeModbus/modbus/mb_m.c b/FreeModbus/modbus/mb_m.c
index b97d2e5..281cbf5 100644
--- a/FreeModbus/modbus/mb_m.c
+++ b/FreeModbus/modbus/mb_m.c
@@ -65,7 +65,6 @@
 
 static UCHAR    ucMBMasterDestAddress;
 static BOOL     xMBRunInMasterMode = FALSE;
-static BOOL     xMasterIsBusy = FALSE;
 
 static enum
 {
@@ -185,6 +184,8 @@ eMBMasterInit( eMBMode eMode, UCHAR ucPort, ULONG ulBaudRate, eMBParity eParity
 		{
 			eMBState = STATE_DISABLED;
 		}
+		/* initialize the Mobus Master mutex */
+		vMBasterRunMutexInit();
 	}
 	return eStatus;
 }
@@ -318,33 +319,23 @@ eMBMasterPoll( void )
 			}
             /* If master has exception ,Master will send error process.Otherwise the Master is idle.*/
             if (eException != MB_EX_NONE) ( void ) xMBMasterPortEventPost( EV_MASTER_ERROR_PROCESS );
-            else vMBMasterSetIsBusy( FALSE );
+            else vMBasterRunMutexUnlock();
             break;
 
         case EV_MASTER_FRAME_SENT:
         	/* Master is busy now. */
-        	vMBMasterSetIsBusy( TRUE );
         	vMBMasterGetPDUSndBuf( &ucMBFrame );
 			eStatus = peMBMasterFrameSendCur( ucMBMasterGetDestAddress(), ucMBFrame, ucMBMasterGetPDUSndLength() );
             break;
 
         case EV_MASTER_ERROR_PROCESS:
-        	vMBMasterSetIsBusy( FALSE );
+        	vMBasterRunMutexUnlock();
         	break;
         }
     }
     return MB_ENOERR;
 }
-/* Get whether the Modbus Master is busy.*/
-BOOL xMBMasterGetIsBusy( void )
-{
-	return xMasterIsBusy;
-}
-/* Set whether the Modbus Master is busy.*/
-void vMBMasterSetIsBusy( BOOL IsBusy )
-{
-	xMasterIsBusy = IsBusy;
-}
+
 /* Get whether the Modbus Master is run in master mode.*/
 BOOL xMBMasterGetCBRunInMasterMode( void )
 {
diff --git a/FreeModbus/modbus/rtu/mbrtu_m.c b/FreeModbus/modbus/rtu/mbrtu_m.c
index 2cfa5b5..b0ae52b 100644
--- a/FreeModbus/modbus/rtu/mbrtu_m.c
+++ b/FreeModbus/modbus/rtu/mbrtu_m.c
@@ -393,7 +393,7 @@ xMBMasterRTUTimerExpired(void)
 
 	vMBMasterPortTimersDisable( );
 	/* If timer mode is convert delay ,then Master is idel now. */
-	if (eMasterCurTimerMode == MB_TMODE_CONVERT_DELAY) vMBMasterSetIsBusy( FALSE );
+	if (eMasterCurTimerMode == MB_TMODE_CONVERT_DELAY) vMBasterRunMutexUnlock();
 
 	return xNeedPoll;
 }
diff --git a/FreeModbus/port/portevent_m.c b/FreeModbus/port/portevent_m.c
index 4a7ba22..07caa85 100644
--- a/FreeModbus/port/portevent_m.c
+++ b/FreeModbus/port/portevent_m.c
@@ -22,11 +22,13 @@
 /* ----------------------- Modbus includes ----------------------------------*/
 #include "mb.h"
 #include "mbport.h"
+#include "port.h"
 
 #if MB_MASTER_RTU_ENABLED > 0 || MB_MASTER_ASCII_ENABLED > 0
 /* ----------------------- Variables ----------------------------------------*/
 static eMBMasterEventType eMasterQueuedEvent;
-static BOOL     xMasterEventInQueue;
+static BOOL               xMasterEventInQueue;
+static struct rt_mutex    xMasterRunMutex;
 
 /* ----------------------- Start implementation -----------------------------*/
 BOOL
@@ -58,4 +60,38 @@ xMBMasterPortEventGet( eMBMasterEventType * eEvent )
     return xEventHappened;
 }
 
+/**
+ * This function is initialize the Mobus Master mutex .
+ * Note:The mutex is define by Operating System.If you not use Opearting System this function can be empty.
+ *
+ */
+void vMBasterRunMutexInit( void )
+{
+	rt_mutex_init(&xMasterRunMutex, "master run", RT_IPC_FLAG_PRIO);
+}
+
+/**
+ * This function is lock Mobus Master mutex.
+ * Note:The mutex is define by Operating System.If you not use Opearting System this function can be just return TRUE.
+ *
+ * @param lTimeOut the waiting time.
+ *
+ * @return mutex lock result
+ */
+BOOL xMBasterRunMutexLock( LONG lTimeOut )
+{
+	/*If waiting time is -1 .It will wait forever */
+	return rt_mutex_take(&xMasterRunMutex, lTimeOut) ? FALSE : TRUE ;
+}
+
+/**
+ * This function is unlock Mobus Master mutex.
+ * Note:The mutex is define by Operating System.If you not use Opearting System this function can be empty.
+ *
+ */
+void vMBasterRunMutexUnlock( void )
+{
+	rt_mutex_release(&xMasterRunMutex);
+}
+
 #endif