diff --git a/lib/Hoymiles/src/commands/SystemConfigParaCommand.cpp b/lib/Hoymiles/src/commands/SystemConfigParaCommand.cpp
index 8d310f4..ef28546 100644
--- a/lib/Hoymiles/src/commands/SystemConfigParaCommand.cpp
+++ b/lib/Hoymiles/src/commands/SystemConfigParaCommand.cpp
@@ -27,11 +27,13 @@ bool SystemConfigParaCommand::handleResponse(InverterAbstract* inverter, fragmen
 
     // Move all fragments into target buffer
     uint8_t offs = 0;
+    inverter->SystemConfigPara()->beginAppendFragment();
     inverter->SystemConfigPara()->clearBuffer();
     for (uint8_t i = 0; i < max_fragment_id; i++) {
         inverter->SystemConfigPara()->appendFragment(offs, fragment[i].fragment, fragment[i].len);
         offs += (fragment[i].len);
     }
+    inverter->SystemConfigPara()->endAppendFragment();
     inverter->SystemConfigPara()->setLastUpdateRequest(millis());
     inverter->SystemConfigPara()->setLastLimitRequestSuccess(CMD_OK);
     return true;
diff --git a/lib/Hoymiles/src/parser/SystemConfigParaParser.cpp b/lib/Hoymiles/src/parser/SystemConfigParaParser.cpp
index 0ab4cec..b2598e1 100644
--- a/lib/Hoymiles/src/parser/SystemConfigParaParser.cpp
+++ b/lib/Hoymiles/src/parser/SystemConfigParaParser.cpp
@@ -6,6 +6,18 @@
 #include "../Hoymiles.h"
 #include <cstring>
 
+#define HOY_SEMAPHORE_TAKE() \
+    do {                     \
+    } while (xSemaphoreTake(_xSemaphore, portMAX_DELAY) != pdPASS)
+#define HOY_SEMAPHORE_GIVE() xSemaphoreGive(_xSemaphore)
+
+SystemConfigParaParser::SystemConfigParaParser()
+    : Parser()
+{
+    _xSemaphore = xSemaphoreCreateMutex();
+    HOY_SEMAPHORE_GIVE(); // release before first use
+}
+
 void SystemConfigParaParser::clearBuffer()
 {
     memset(_payload, 0, SYSTEM_CONFIG_PARA_SIZE);
@@ -22,15 +34,30 @@ void SystemConfigParaParser::appendFragment(uint8_t offset, uint8_t* payload, ui
     _payloadLength += len;
 }
 
+void SystemConfigParaParser::beginAppendFragment()
+{
+    HOY_SEMAPHORE_TAKE();
+}
+
+void SystemConfigParaParser::endAppendFragment()
+{
+    HOY_SEMAPHORE_GIVE();
+}
+
 float SystemConfigParaParser::getLimitPercent()
 {
-    return ((((uint16_t)_payload[2]) << 8) | _payload[3]) / 10.0;
+    HOY_SEMAPHORE_TAKE();
+    float ret = ((((uint16_t)_payload[2]) << 8) | _payload[3]) / 10.0;
+    HOY_SEMAPHORE_GIVE();
+    return ret;
 }
 
 void SystemConfigParaParser::setLimitPercent(float value)
 {
+    HOY_SEMAPHORE_TAKE();
     _payload[2] = ((uint16_t)(value * 10)) >> 8;
     _payload[3] = ((uint16_t)(value * 10));
+    HOY_SEMAPHORE_GIVE();
 }
 
 void SystemConfigParaParser::setLastLimitCommandSuccess(LastCommandSuccess status)
diff --git a/lib/Hoymiles/src/parser/SystemConfigParaParser.h b/lib/Hoymiles/src/parser/SystemConfigParaParser.h
index 5aced3c..4ec7381 100644
--- a/lib/Hoymiles/src/parser/SystemConfigParaParser.h
+++ b/lib/Hoymiles/src/parser/SystemConfigParaParser.h
@@ -7,8 +7,11 @@
 
 class SystemConfigParaParser : public Parser {
 public:
+    SystemConfigParaParser();
     void clearBuffer();
     void appendFragment(uint8_t offset, uint8_t* payload, uint8_t len);
+    void beginAppendFragment();
+    void endAppendFragment();
 
     float getLimitPercent();
     void setLimitPercent(float value);
@@ -32,4 +35,6 @@ private:
 
     uint32_t _lastUpdateCommand = 0;
     uint32_t _lastUpdateRequest = 0;
+
+    SemaphoreHandle_t _xSemaphore;
 };
\ No newline at end of file