diff --git a/src/modules/exec/EctoControlAdapter/EctoControlAdapter.cpp b/src/modules/exec/EctoControlAdapter/EctoControlAdapter.cpp
index c8c7e1f2..660269d2 100644
--- a/src/modules/exec/EctoControlAdapter/EctoControlAdapter.cpp
+++ b/src/modules/exec/EctoControlAdapter/EctoControlAdapter.cpp
@@ -329,11 +329,11 @@ public:
     bool writeFunctionModBus(const uint16_t &reg, uint16_t &data)
     {
         // set word 0 of TX buffer to least-significant word of counter (bits 15..0)
-        node.setTransmitBuffer(1, lowWord(data));
+        //node.setTransmitBuffer(1, lowWord(data));
         // set word 1 of TX buffer to most-significant word of counter (bits 31..16)
-        node.setTransmitBuffer(0, highWord(data));
+        //node.setTransmitBuffer(0, highWord(data));
         // slave: write TX buffer to (2) 16-bit registers starting at register 0
-        uint8_t result = node.writeMultipleRegisters(0, 2);
+        uint8_t result = node.writeSingleRegister(reg, data);
         if (_debug > 2)
         {
             SerialPrint("I", "EctoControlAdapter", "writeSingleRegister, addr: " + String((uint8_t)_addr, HEX) + ", reg: " + String(reg, HEX) + ", state: " + String(data) + " = result: " + String(result, HEX));
@@ -585,7 +585,8 @@ public:
     bool setTypeConnect(float &data)
     {
         bool ret = false;
-        if (writeFunctionModBus(ecW_SetTypeConnect, (uint16_t &)data))
+        uint16_t data16 = data;
+        if (writeFunctionModBus(ecW_SetTypeConnect, data16))
         {
             // TODO запросить результат записи у адаптера
             ret = true;
@@ -631,7 +632,8 @@ public:
     bool setMinCH(float &data)
     {
         bool ret = false;
-        if (writeFunctionModBus(ecW_TSetMinCH, (uint16_t &)data))
+        uint16_t data16 = data;
+        if (writeFunctionModBus(ecW_TSetMinCH, data16))
         {
             ret = true;
         }
@@ -645,7 +647,8 @@ public:
     bool setMaxCH(float &data)
     {
         bool ret = false;
-        if (writeFunctionModBus(ecW_TSetMaxCH, (uint16_t &)data))
+        uint16_t data16 = data;
+        if (writeFunctionModBus(ecW_TSetMaxCH, data16))
         {
             ret = true;
         }
@@ -659,7 +662,8 @@ public:
     bool setMinDHW(float &data)
     {
         bool ret = false;
-        if (writeFunctionModBus(ecW_TSetMinDHW, (uint16_t &)data))
+        uint16_t data16 = data;
+        if (writeFunctionModBus(ecW_TSetMinDHW, data16))
         {
             ret = true;
         }
@@ -673,7 +677,8 @@ public:
     bool setMaxDHW(float &data)
     {
         bool ret = false;
-        if (writeFunctionModBus(ecW_TSetMaxDHW, (uint16_t &)data))
+        uint16_t data16 = data;
+        if (writeFunctionModBus(ecW_TSetMaxDHW, data16))
         {
             ret = true;
         }
@@ -687,7 +692,8 @@ public:
     bool setTDHW(float &data)
     {
         bool ret = false;
-        if (writeFunctionModBus(ecW_TSetDHW, (uint16_t &)data))
+        uint16_t data16 = data;
+        if (writeFunctionModBus(ecW_TSetDHW, data16))
         {
             ret = true;
         }
@@ -701,7 +707,8 @@ public:
     bool setMaxModLevel(float &data)
     {
         bool ret = false;
-        if (writeFunctionModBus(ecW_SetMaxModLevel, (uint16_t &)data))
+        uint16_t data16 = data;
+        if (writeFunctionModBus(ecW_SetMaxModLevel, data16))
         {
             ret = true;
         }
diff --git a/src/modules/exec/EctoControlAdapter/ModbusEC.cpp b/src/modules/exec/EctoControlAdapter/ModbusEC.cpp
index dd88f86c..029e448b 100644
--- a/src/modules/exec/EctoControlAdapter/ModbusEC.cpp
+++ b/src/modules/exec/EctoControlAdapter/ModbusEC.cpp
@@ -253,6 +253,28 @@ uint8_t ModbusMaster::readHoldingRegisters(uint16_t u16ReadAddress,
   return ModbusMasterTransaction(ku8MBReadHoldingRegisters);
 }
 
+/**
+Modbus function 0x06 Write Single Register.
+
+This function code is used to write a single holding register in a 
+remote device. The request specifies the address of the register to be 
+written. Registers are addressed starting at zero.
+
+@param u16WriteAddress address of the holding register (0x0000..0xFFFF)
+@param u16WriteValue value to be written to holding register (0x0000..0xFFFF)
+@return 0 on success; exception number on failure
+@ingroup register
+*/
+uint8_t ModbusMaster::writeSingleRegister(uint16_t u16WriteAddress,
+  uint16_t u16WriteValue)
+{
+  _u16WriteAddress = u16WriteAddress;
+  _u16WriteQty = 0;
+  _u16TransmitBuffer[0] = u16WriteValue;
+  return ModbusMasterTransaction(ku8MBWriteSingleRegister);
+}
+
+
 /**
 Modbus function 0x10 Write Multiple Registers.
 
diff --git a/src/modules/exec/EctoControlAdapter/ModbusEC.h b/src/modules/exec/EctoControlAdapter/ModbusEC.h
index 0f5f1f79..c9cd6fb0 100644
--- a/src/modules/exec/EctoControlAdapter/ModbusEC.h
+++ b/src/modules/exec/EctoControlAdapter/ModbusEC.h
@@ -52,7 +52,7 @@ public:
   uint8_t readHoldingRegisters(uint16_t, uint16_t);
   uint8_t writeMultipleRegisters(uint16_t, uint16_t);
   uint8_t writeMultipleRegisters();
-
+  uint8_t  writeSingleRegister(uint16_t, uint16_t);
   uint8_t readAddresEctoControl();
   uint8_t writeAddresEctoControl(uint8_t);
 
@@ -76,7 +76,7 @@ private:
   // Modbus function codes for 16 bit access
   static const uint8_t ku8MBReadHoldingRegisters = 0x03;   ///< Modbus function 0x03 Read Holding Registers
   static const uint8_t ku8MBWriteMultipleRegisters = 0x10; ///< Modbus function 0x10 Write Multiple Registers
-
+  static const uint8_t ku8MBWriteSingleRegister        = 0x06; ///< Modbus function 0x06 Write Single Register
   static const uint8_t ku8MBProgRead46 = 0x46;  ///< EctoControl function 0x46 Устройство возвращает в ответе свой текущий адрес ADDR
   static const uint8_t ku8MBProgWrite47 = 0x47; ///< EctoControl function 0x47 высылается ведущим устройством ведомому с указанием сменить свой имеющийся адрес на заданный
                                                 // высылается ведущим устройством единственному устройству на шине с неизвестным адресом