diff --git a/df_datalink_sp/src/system_monitor.c b/df_datalink_sp/src/system_monitor.c
index 854320b..f7fddc3 100644
--- a/df_datalink_sp/src/system_monitor.c
+++ b/df_datalink_sp/src/system_monitor.c
@@ -92,7 +92,7 @@ void SysMonitor_Destroy(void)
 }
 
 // @System Info
-void SysMonitor_UpdateSysinfo(SYSINFO *info)
+void SysMonitor_UpdateSysinfo(const SYSINFO *info)
 {
 	uint8_t buffIndx;
 	buffIndx = GetWritable(sysMonitorInst->sysInfoCtrl);
@@ -102,7 +102,7 @@ void SysMonitor_UpdateSysinfo(SYSINFO *info)
 	sysMonitorInst->sysInfoCtrl.wBusy = BUFF_NONE;
 }
 
-void SysMonitor_UpdateSysinfoRaw(uint8_t *buff)
+void SysMonitor_UpdateSysinfoRaw(const uint8_t *buff)
 {
 	ASSERT(sysMonitorInst != NULL);
 	uint8_t buffIndx;
@@ -208,7 +208,7 @@ void SysMonitor_GetSysinfoRaw(uint8_t *buff)
 /**
  * Update send payload by raw data.
  */
-void SysMonitor_UpdateSendPayloadRaw(uint8_t *buff, size_t len)
+void SysMonitor_UpdateSendPayloadRaw(const uint8_t *buff, size_t len)
 {
 	ASSERT(sysMonitorInst != NULL);
 	uint8_t buffIndx;
@@ -245,7 +245,7 @@ void SysMonitor_GetSendPayloadRaw(uint8_t *buff, uint32_t *id, size_t len)
 /**
  * Update receive payload by raw data.
  */
-void SysMonitor_UpdateRecvPayloadRaw(uint8_t *buff, size_t len)
+void SysMonitor_UpdateRecvPayloadRaw(const uint8_t *buff, size_t len)
 {
 	ASSERT(sysMonitorInst != NULL);
 	uint8_t buffIndx;
@@ -282,7 +282,7 @@ void SysMonitor_GetRecvPayloadRaw(uint8_t *buff, uint32_t *id, size_t len)
 /**
  * Log send slot information
  */
-void SysMonitor_UpdateSendSlotLog(SLOTLOG *log)
+void SysMonitor_UpdateSendSlotLog(const SLOTLOG *log)
 {
 	ASSERT(sysMonitorInst != NULL);
 	uint8_t buffIndx;
@@ -346,7 +346,7 @@ void SysMonitor_GetSendSlotLogRaw(uint8_t *buff)
 /**
  * Log receive slot information
  */
-void SysMonitor_UpdateRecvSlotLog(SLOTLOG *log)
+void SysMonitor_UpdateRecvSlotLog(const SLOTLOG *log)
 {
 	ASSERT(sysMonitorInst != NULL);
 	uint8_t buffIndx;
@@ -410,7 +410,7 @@ void SysMonitor_GetRecvSlotLogRaw(uint8_t *buff)
 /**
  * Log protocol running status.
  */
-void SysMonitor_UpdateProtocolLog(PRTCLLOG *log)
+void SysMonitor_UpdateProtocolLog(const PRTCLLOG *log)
 {
 	ASSERT(sysMonitorInst != NULL);
 	uint8_t buffIndx;
@@ -475,7 +475,7 @@ void SysMonitor_GetProtocolLogRaw(uint8_t *buff)
 /**
  * Log hardware running status.
  */
-void SysMonitor_UpdateHardwareStatus(HWSTATE *state)
+void SysMonitor_UpdateHardwareStatus(const HWSTATE *state)
 {
 	ASSERT(sysMonitorInst != NULL);
 	uint8_t buffIndx;
diff --git a/df_datalink_sp/src/system_monitor.h b/df_datalink_sp/src/system_monitor.h
index 10774fb..ca57863 100644
--- a/df_datalink_sp/src/system_monitor.h
+++ b/df_datalink_sp/src/system_monitor.h
@@ -142,19 +142,19 @@ typedef struct
 int32_t SysMonitor_Init(void);
 void SysMonitor_Destroy(void);
 
-void SysMonitor_UpdateSysinfo(SYSINFO *info);
-void SysMonitor_UpdateSysinfoRaw(uint8_t *buff);
+void SysMonitor_UpdateSysinfo(const SYSINFO *info);
+void SysMonitor_UpdateSysinfoRaw(const uint8_t *buff);
 void SysMonitor_GetSysinfo(SYSINFO *info);
 void SysMonitor_GetSysinfoRaw(uint8_t *buff);
 
-void SysMonitor_UpdateSendPayloadRaw(uint8_t *buff, size_t len);
-void SysMonitor_UpdateRecvPayloadRaw(uint8_t *buff, size_t len);
+void SysMonitor_UpdateSendPayloadRaw(const uint8_t *buff, size_t len);
+void SysMonitor_UpdateRecvPayloadRaw(const uint8_t *buff, size_t len);
 void SysMonitor_GetSendPayloadRaw(uint8_t *buff, uint32_t *id, size_t len);
 void SysMonitor_GetRecvPayloadRaw(uint8_t *buff, uint32_t *id, size_t len);
 
-void SysMonitor_UpdateSendSlotLog(SLOTLOG *log);
-void SysMonitor_UpdateRecvSlotLog(SLOTLOG *log);
-void SysMonitor_UpdateProtocolLog(PRTCLLOG *log);
+void SysMonitor_UpdateSendSlotLog(const SLOTLOG *log);
+void SysMonitor_UpdateRecvSlotLog(const SLOTLOG *log);
+void SysMonitor_UpdateProtocolLog(const PRTCLLOG *log);
 void SysMonitor_GetSendSlotLog(SLOTLOG *log);
 void SysMonitor_GetRecvSlotLog(SLOTLOG *log);
 void SysMonitor_GetProtocolLog(PRTCLLOG *log);
@@ -162,9 +162,8 @@ void SysMonitor_GetSendSlotLogRaw(uint8_t *buff);
 void SysMonitor_GetRecvSlotLogRaw(uint8_t *buff);
 void SysMonitor_GetProtocolLogRaw(uint8_t *buff);
 
-void SysMonitor_UpdateHardwareStatus(HWSTATE *state);
+void SysMonitor_UpdateHardwareStatus(const HWSTATE *state);
 void SysMonitor_GetHardwareStatus(HWSTATE *state);
-void SysMonitor_GetHardwareStatusRaw(uint8_t *buff);
 
 void SysMonitor_GetSyslog(SYSLOG *log);
 void SysMonitor_GetSyslogRaw(uint8_t *buff);