diff --git a/FreeModbus 主机分析图.vsd b/FreeModbus 主机分析图.vsd
index 51b6809..6e6c68b 100644
Binary files a/FreeModbus 主机分析图.vsd and b/FreeModbus 主机分析图.vsd differ
diff --git a/FreeModbus/modbus/functions/mbfunccoils_m.c b/FreeModbus/modbus/functions/mbfunccoils_m.c
index c78ad10..324bed5 100644
--- a/FreeModbus/modbus/functions/mbfunccoils_m.c
+++ b/FreeModbus/modbus/functions/mbfunccoils_m.c
@@ -120,7 +120,12 @@ eMBMasterFuncReadCoils( UCHAR * pucFrame, USHORT * usLen )
     eMBException    eStatus = MB_EX_NONE;
     eMBErrorCode    eRegStatus;
 
-    if( *usLen >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READ_SIZE_MIN )
+    /* If this request is broadcast, and it's read mode. This request don't need execute. */
+    if ( xMBMasterRequestIsBroadcast() )
+    {
+    	eStatus = MB_EX_NONE;
+    }
+    else if ( *usLen >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READ_SIZE_MIN )
     {
     	vMBMasterGetPDUSndBuf(&ucMBFrame);
         usRegAddress = ( USHORT )( ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF] << 8 );
diff --git a/FreeModbus/modbus/functions/mbfuncdisc_m.c b/FreeModbus/modbus/functions/mbfuncdisc_m.c
index 5cc35e2..ed865ed 100644
--- a/FreeModbus/modbus/functions/mbfuncdisc_m.c
+++ b/FreeModbus/modbus/functions/mbfuncdisc_m.c
@@ -104,7 +104,12 @@ eMBMasterFuncReadDiscreteInputs( UCHAR * pucFrame, USHORT * usLen )
     eMBException    eStatus = MB_EX_NONE;
     eMBErrorCode    eRegStatus;
 
-    if( *usLen >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READ_SIZE_MIN )
+    /* If this request is broadcast, and it's read mode. This request don't need execute. */
+    if ( xMBMasterRequestIsBroadcast() )
+    {
+    	eStatus = MB_EX_NONE;
+    }
+    else if( *usLen >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READ_SIZE_MIN )
     {
     	vMBMasterGetPDUSndBuf(&ucMBFrame);
         usRegAddress = ( USHORT )( ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF] << 8 );
diff --git a/FreeModbus/modbus/functions/mbfuncholding_m.c b/FreeModbus/modbus/functions/mbfuncholding_m.c
index ffbe294..ef81062 100644
--- a/FreeModbus/modbus/functions/mbfuncholding_m.c
+++ b/FreeModbus/modbus/functions/mbfuncholding_m.c
@@ -294,7 +294,12 @@ eMBMasterFuncReadHoldingRegister( UCHAR * pucFrame, USHORT * usLen )
     eMBException    eStatus = MB_EX_NONE;
     eMBErrorCode    eRegStatus;
 
-    if( *usLen >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READ_SIZE_MIN )
+    /* If this request is broadcast, and it's read mode. This request don't need execute. */
+    if ( xMBMasterRequestIsBroadcast() )
+    {
+    	eStatus = MB_EX_NONE;
+    }
+    else if( *usLen >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READ_SIZE_MIN )
     {
 		vMBMasterGetPDUSndBuf(&ucMBFrame);
         usRegAddress = ( USHORT )( ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF] << 8 );
@@ -397,7 +402,12 @@ eMBMasterFuncReadWriteMultipleHoldingRegister( UCHAR * pucFrame, USHORT * usLen
     eMBException    eStatus = MB_EX_NONE;
     eMBErrorCode    eRegStatus;
 
-    if( *usLen >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READWRITE_SIZE_MIN )
+    /* If this request is broadcast, and it's read mode. This request don't need execute. */
+    if ( xMBMasterRequestIsBroadcast() )
+    {
+    	eStatus = MB_EX_NONE;
+    }
+    else if( *usLen >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READWRITE_SIZE_MIN )
     {
     	vMBMasterGetPDUSndBuf(&ucMBFrame);
         usRegReadAddress = ( USHORT )( ucMBFrame[MB_PDU_REQ_READWRITE_READ_ADDR_OFF] << 8U );
diff --git a/FreeModbus/modbus/functions/mbfuncinput_m.c b/FreeModbus/modbus/functions/mbfuncinput_m.c
index 728ecc0..653414f 100644
--- a/FreeModbus/modbus/functions/mbfuncinput_m.c
+++ b/FreeModbus/modbus/functions/mbfuncinput_m.c
@@ -103,7 +103,12 @@ eMBMasterFuncReadInputRegister( UCHAR * pucFrame, USHORT * usLen )
     eMBException    eStatus = MB_EX_NONE;
     eMBErrorCode    eRegStatus;
 
-    if( *usLen >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READ_SIZE_MIN )
+    /* If this request is broadcast, and it's read mode. This request don't need execute. */
+	if ( xMBMasterRequestIsBroadcast() )
+	{
+		eStatus = MB_EX_NONE;
+	}
+	else if( *usLen >= MB_PDU_SIZE_MIN + MB_PDU_FUNC_READ_SIZE_MIN )
     {
 		vMBMasterGetPDUSndBuf(&ucMBFrame);
         usRegAddress = ( USHORT )( ucMBFrame[MB_PDU_REQ_READ_ADDR_OFF] << 8 );
diff --git a/FreeModbus/modbus/include/mb_m.h b/FreeModbus/modbus/include/mb_m.h
index abe4889..15ebb0e 100644
--- a/FreeModbus/modbus/include/mb_m.h
+++ b/FreeModbus/modbus/include/mb_m.h
@@ -389,6 +389,7 @@ void vMBMasterSetCBRunInMasterMode( BOOL IsMasterMode );
 USHORT usMBMasterGetPDUSndLength( void );
 void vMBMasterSetPDUSndLength( USHORT SendPDULength );
 void vMBMasterSetCurTimerMode( eMBMasterTimerMode eMBTimerMode );
+BOOL xMBMasterRequestIsBroadcast( void );
 eMBMasterErrorEventType eMBMasterGetErrorType( void );
 void vMBMasterSetErrorType( eMBMasterErrorEventType errorType );
 eMBMasterReqErrCode vMBMasterWaitRequestFinish( void );
diff --git a/FreeModbus/modbus/include/mbconfig.h b/FreeModbus/modbus/include/mbconfig.h
index 0862c70..89030b7 100644
--- a/FreeModbus/modbus/include/mbconfig.h
+++ b/FreeModbus/modbus/include/mbconfig.h
@@ -116,8 +116,8 @@ PR_BEGIN_EXTERN_C
  * And if slave is not respond in this time,the master will process this timeout error.
  * Then master can send other frame */
 #define MB_MASTER_TIMEOUT_MS_RESPOND            (100 )
-/*! \brief The total slaves in Modbus Master system.Default 16.
- * Note : The slave ID must be continuous from 0.*/
+/*! \brief The total slaves in Modbus Master system. Default 16.
+ * \note : The slave ID must be continuous from 1.*/
 #define MB_MASTER_TOTAL_SLAVE_NUM               ( 16 )
 #endif
 
diff --git a/FreeModbus/modbus/mb_m.c b/FreeModbus/modbus/mb_m.c
index 962bb13..4e7c4b2 100644
--- a/FreeModbus/modbus/mb_m.c
+++ b/FreeModbus/modbus/mb_m.c
@@ -259,7 +259,7 @@ eMBMasterPoll( void )
     static USHORT   usLength;
     static eMBException eException;
 
-    int             i;
+    int             i , j;
     eMBErrorCode    eStatus = MB_ENOERR;
     eMBMasterEventType    eEvent;
     eMBMasterErrorEventType errorType;
@@ -305,16 +305,24 @@ eMBMasterPoll( void )
 				for (i = 0; i < MB_FUNC_HANDLERS_MAX; i++)
 				{
 					/* No more function handlers registered. Abort. */
-					if (xMasterFuncHandlers[i].ucFunctionCode == 0)
-					{
+					if (xMasterFuncHandlers[i].ucFunctionCode == 0)	{
 						break;
 					}
-					else if (xMasterFuncHandlers[i].ucFunctionCode
-							== ucFunctionCode)
-					{
+					else if (xMasterFuncHandlers[i].ucFunctionCode == ucFunctionCode) {
 						vMBMasterSetCBRunInMasterMode(TRUE);
-						eException = xMasterFuncHandlers[i].pxHandler(ucMBFrame,
-								&usLength);
+						/* If master request is broadcast,
+						 * the master need execute function for all slave.
+						 */
+						if ( xMBMasterRequestIsBroadcast() ) {
+							usLength = usMBMasterGetPDUSndLength();
+							for(j = 1; j <= MB_MASTER_TOTAL_SLAVE_NUM; j++){
+								vMBMasterSetDestAddress(j);
+								eException = xMasterFuncHandlers[i].pxHandler(ucMBFrame, &usLength);
+							}
+						}
+						else {
+							eException = xMasterFuncHandlers[i].pxHandler(ucMBFrame, &usLength);
+						}
 						vMBMasterSetCBRunInMasterMode(FALSE);
 						break;
 					}
diff --git a/FreeModbus/modbus/rtu/mbrtu_m.c b/FreeModbus/modbus/rtu/mbrtu_m.c
index 55ff739..4756f57 100644
--- a/FreeModbus/modbus/rtu/mbrtu_m.c
+++ b/FreeModbus/modbus/rtu/mbrtu_m.c
@@ -395,10 +395,9 @@ xMBMasterRTUTimerExpired(void)
 	eSndState = STATE_M_TX_IDLE;
 
 	vMBMasterPortTimersDisable( );
-	/* If timer mode is convert delay ,then Master is idel now. */
+	/* If timer mode is convert delay, the master event then turns EV_MASTER_EXECUTE status. */
 	if (eMasterCurTimerMode == MB_TMODE_CONVERT_DELAY) {
-		vMBMasterCBRequestScuuess( );
-		vMBMasterRunResRelease( );
+		xNeedPoll = xMBMasterPortEventPost( EV_MASTER_EXECUTE );
 	}
 
 	return xNeedPoll;
@@ -433,5 +432,10 @@ void vMBMasterSetCurTimerMode( eMBMasterTimerMode eMBTimerMode )
 {
 	eMasterCurTimerMode = eMBTimerMode;
 }
+
+/* The master request is broadcast? */
+BOOL xMBMasterRequestIsBroadcast( void ){
+	return xFrameIsBroadcast;
+}
 #endif