diff --git a/lib/RS485/RS485_Driver.cpp b/lib/RS485/RS485_Driver.cpp
index a53bfd2..36793c9 100644
--- a/lib/RS485/RS485_Driver.cpp
+++ b/lib/RS485/RS485_Driver.cpp
@@ -71,7 +71,6 @@ namespace drivers
   const bool MODBUS::readCoils(const uint8_t device, const uint16_t reg, const uint16_t num, std::vector<bool> &coils)
   {
     constexpr uint8_t func = 0x01;
-    std::lock_guard<std::mutex> lock(m_mutex);
     LOG_DEBUG("Read coils: dev[", device, "], reg[", reg, "], num[", num, "]");
     return readBinary(device, func, reg, num, coils);
   }
@@ -80,7 +79,6 @@ namespace drivers
   const bool MODBUS::readInputs(const uint8_t device, const uint16_t reg, const uint8_t num, std::vector<bool> &inputs)
   {
     constexpr uint8_t func = 0x02;
-    std::lock_guard<std::mutex> lock(m_mutex);
     LOG_DEBUG("Read multi inputs: dev[", device, "], reg[", reg, "], num[", num, "]");
     return readBinary(device, func, reg, num, inputs);
   }
@@ -89,7 +87,6 @@ namespace drivers
   const bool MODBUS::readHoldingRegisters(const uint8_t device, const uint16_t reg, const uint8_t num, std::vector<uint16_t> &values)
   {
     constexpr uint8_t func = 0x03;
-    std::lock_guard<std::mutex> lock(m_mutex);
     LOG_DEBUG("Read multi holding registers: dev[", device, "], reg[", reg, "], num[", num, "]");
     return readInteger(device, func, reg, num, values);
   }
@@ -98,7 +95,6 @@ namespace drivers
   const bool MODBUS::readInputRegisters(const uint8_t device, const uint16_t reg, const uint8_t num, std::vector<uint16_t> &values)
   {
     constexpr uint8_t func = 0x04;
-    std::lock_guard<std::mutex> lock(m_mutex);
     LOG_DEBUG("Read multi input registers: dev[", device, "], reg[", reg, "], num[", num, "]");
     return readInteger(device, func, reg, num, values);
   }
@@ -107,7 +103,6 @@ namespace drivers
   const bool MODBUS::writeCoil(const uint8_t device, const uint16_t coil, const bool value)
   {
     constexpr uint8_t func = 0x05;
-    std::lock_guard<std::mutex> lock(m_mutex);
     LOG_DEBUG("Write single coil: dev[", device, "], coil[", coil, "], value[", value ? "true" : "false", "]");
     return writeBinary(device, func, coil, {value});
   }
@@ -116,7 +111,6 @@ namespace drivers
   const bool MODBUS::writeRegister(const uint8_t device, const uint16_t reg, const uint16_t value)
   {
     constexpr uint8_t func = 0x06;
-    std::lock_guard<std::mutex> lock(m_mutex);
     LOG_DEBUG("Write single register: dev[", device, "], reg[", reg, "], value[", value, "]");
     return writeInteger(device, func, reg, {value}, false);
   }
@@ -125,7 +119,6 @@ namespace drivers
   const bool MODBUS::writeCoils(const uint8_t device, const uint16_t coils, const std::vector<bool> &values)
   {
     constexpr uint8_t func = 0x0F;
-    std::lock_guard<std::mutex> lock(m_mutex);
     LOG_DEBUG("Write multi coils: dev[", device, "], start[", coils, "], num[", values.size(), "]");
     return writeBinary(device, func, coils, values);
   }
@@ -134,7 +127,6 @@ namespace drivers
   const bool MODBUS::writeRegisters(const uint8_t device, const uint16_t reg, const std::vector<uint16_t> &values)
   {
     constexpr uint8_t func = 0x10;
-    std::lock_guard<std::mutex> lock(m_mutex);
     LOG_DEBUG("Write multi registers: dev[", device, "], start[", reg, "], num[", values.size(), "]");
     return writeInteger(device, func, reg, values, true);
   }
diff --git a/lib/RS485/RS485_Driver.h b/lib/RS485/RS485_Driver.h
index d3d968e..4e96fbe 100644
--- a/lib/RS485/RS485_Driver.h
+++ b/lib/RS485/RS485_Driver.h
@@ -60,6 +60,10 @@ namespace drivers
         MODBUS(const MODBUS &) = delete; // remove copy constructors
         MODBUS &operator=(const MODBUS &) = delete;
 
+        // Get transaction lock
+        std::unique_lock<std::mutex> getLock() {
+            return std::unique_lock<std::mutex>(m_mutex);
+        }
 
         // Func 0x01
         const bool readCoils(const uint8_t device, const uint16_t reg, const uint16_t num, std::vector<bool> &coils);
diff --git a/lib/SENECA/S50140_Driver.cpp b/lib/SENECA/S50140_Driver.cpp
index 0531275..1647748 100644
--- a/lib/SENECA/S50140_Driver.cpp
+++ b/lib/SENECA/S50140_Driver.cpp
@@ -76,6 +76,7 @@ namespace drivers
     {
         std::vector<uint16_t> value;
         delayRequest();
+        auto lock = m_bus.getLock();
         m_bus.readHoldingRegisters(m_address, REG_Regset, 2, value);
         if (value.empty())
             return UINT8_MAX;
@@ -86,6 +87,7 @@ namespace drivers
     {
         std::vector<uint16_t> value;
         delayRequest();
+        auto lock = m_bus.getLock();
         m_bus.readHoldingRegisters(m_address, REG_PartCount, 2, value);
         if (value.empty())
             return UINT16_MAX;
@@ -103,6 +105,7 @@ namespace drivers
         {
             bool ok(true);
             delayRequest();
+            auto lock = m_bus.getLock();
             LOG_WARN("Powermeter Counter STOP");
             ok &= m_bus.writeRegisters(m_address, REG_PartCount, {nullVal, stopAll});
             delayRequest();
@@ -126,6 +129,7 @@ namespace drivers
         while (retries++ < maxRetries)
         {
             delayRequest();
+            auto lock = m_bus.getLock();
             if (m_bus.readHoldingRegisters(m_address, reg, dataWords, values) && values.size() == dataWords)
             {
                 floatval_t fv;           // potrebbe essere il contrario, vedremo
diff --git a/lib/TEMP/R4DCB08_Driver.cpp b/lib/TEMP/R4DCB08_Driver.cpp
index 92d2ea0..1dc2b5e 100644
--- a/lib/TEMP/R4DCB08_Driver.cpp
+++ b/lib/TEMP/R4DCB08_Driver.cpp
@@ -22,6 +22,7 @@ namespace drivers
         }
         while (retries++ < maxRetries)
         {
+            auto lock = m_bus.getLock();
             if (m_bus.readHoldingRegisters(m_address, REG_TEMP + ch, 1, rawT) && !rawT.empty())
             {
                 return rawT.front() / 10.0f;
@@ -40,6 +41,7 @@ namespace drivers
         std::vector<float> out;
         while (retries++ < maxRetries)
         {
+            auto lock = m_bus.getLock();
             if (m_bus.readHoldingRegisters(m_address, REG_TEMP, getNum(), rawT) && !rawT.empty())
             {
                 out.reserve(rawT.size());
@@ -67,6 +69,7 @@ namespace drivers
         { // convert to decimal degreees to register value
             while (retries++ < maxRetries)
             {
+                auto lock = m_bus.getLock();
                 if (m_bus.writeRegister(m_address, REG_TEMPCORR + channel, v*10))
                 {
                     channel++;
@@ -88,6 +91,7 @@ namespace drivers
 
         while (retries++ < maxRetries)
         {
+            auto lock = m_bus.getLock();
             if (m_bus.readHoldingRegisters(m_address, REG_TEMPCORR, getNum(), rawV))
             {
                 out.reserve(rawV.size());
@@ -114,6 +118,7 @@ namespace drivers
         std::vector<uint16_t> rawT;
         while (retries++ < maxRetries)
         {
+            auto lock = m_bus.getLock();
             if (m_bus.readHoldingRegisters(m_address, REG_TEMP, T_MAX, rawT))
             {
                 for (auto v : rawT)
diff --git a/src/remoteIO.cpp b/src/remoteIO.cpp
index 8da6d71..8f11e58 100644
--- a/src/remoteIO.cpp
+++ b/src/remoteIO.cpp
@@ -4,6 +4,7 @@ remoteIO::remoteIO(const uint8_t address, drivers::MODBUS &bus) : m_address(addr
 {
     LOG_INFO("Initializing relay module");
     std::vector<uint16_t> response;
+    auto lock = m_bus.getLock();
     if (!m_bus.readHoldingRegisters(m_address, REG_VERSION, 1, response))
     {
         LOG_ERROR("Unable to inizialize relay module");
@@ -21,6 +22,7 @@ remoteIO::~remoteIO()
 
 const bool remoteIO::setOut(const channel_t ch, const bool value)
 {
+    auto lock = m_bus.getLock();
     if (!m_initialized)
         return false;
     LOG_DEBUG("Write Channel", ch, "->", value ? "True" : "False");
@@ -29,6 +31,7 @@ const bool remoteIO::setOut(const channel_t ch, const bool value)
 
 const bool remoteIO::toggleOut(const channel_t ch)
 {
+    auto lock = m_bus.getLock();
     if (!m_initialized)
         return false;
     std::vector<bool> value;
@@ -40,6 +43,7 @@ const bool remoteIO::toggleOut(const channel_t ch)
 
 const bool remoteIO::setOutPort(const std::vector<bool> values)
 {
+    auto lock = m_bus.getLock();
     if (!m_initialized)
         return false;
     LOG_DEBUG("Write Port", CH_MAX);
@@ -48,6 +52,7 @@ const bool remoteIO::setOutPort(const std::vector<bool> values)
 
 const bool remoteIO::getOut(const channel_t ch, bool &value)
 {
+    auto lock = m_bus.getLock();
     if (!m_initialized)
         return false;
     std::vector<bool> values;
@@ -60,6 +65,7 @@ const bool remoteIO::getOut(const channel_t ch, bool &value)
 
 const bool remoteIO::getOutPort(std::vector<bool> &values)
 {
+    auto lock = m_bus.getLock();
     if (!m_initialized)
         return false;
     LOG_DEBUG("Read Port", CH_MAX);
@@ -68,6 +74,7 @@ const bool remoteIO::getOutPort(std::vector<bool> &values)
 
 const bool remoteIO::getIn(const channel_t input, bool &value)
 {
+    auto lock = m_bus.getLock();
     if (!m_initialized)
         return false;
     std::vector<bool> values;
@@ -80,6 +87,7 @@ const bool remoteIO::getIn(const channel_t input, bool &value)
 
 const bool remoteIO::getInPort(std::vector<bool> &values)
 {
+    auto lock = m_bus.getLock();
     if (!m_initialized)
         return false;
     LOG_DEBUG("Read Inputs", CH_MAX);