diff --git a/radio/src/gui/480x272/radio_hardware.cpp b/radio/src/gui/480x272/radio_hardware.cpp
index 3ba908ad9..8020bf983 100644
--- a/radio/src/gui/480x272/radio_hardware.cpp
+++ b/radio/src/gui/480x272/radio_hardware.cpp
@@ -372,7 +372,7 @@ bool menuRadioHardware(event_t event)
 #if defined(RADIO_TX16S)
         lcdDrawText(lcdNextPos, y, " (TTL)");
 #endif
-        g_eeGeneral.auxSerialMode = editChoice(HW_SETTINGS_COLUMN2, y, STR_AUX_SERIAL_MODES, g_eeGeneral.auxSerialMode, 0, UART_MODE_MAX, attr, event);
+        g_eeGeneral.auxSerialMode = editChoice(HW_SETTINGS_COLUMN2, y, STR_AUX_SERIAL_MODES, g_eeGeneral.auxSerialMode, 0, UART_MODE_MAX, attr, event, isAux1ModeAvailable);
         if (attr && checkIncDec_Ret) {
           auxSerialInit(g_eeGeneral.auxSerialMode, modelTelemetryProtocol());
         }
@@ -385,7 +385,7 @@ bool menuRadioHardware(event_t event)
 #if defined(RADIO_TX16S)
         lcdDrawText(lcdNextPos, y, " (TTL)");
 #endif
-        g_eeGeneral.aux2SerialMode = editChoice(HW_SETTINGS_COLUMN2, y, STR_AUX_SERIAL_MODES, g_eeGeneral.aux2SerialMode, 0, UART_MODE_MAX, attr, event);
+        g_eeGeneral.aux2SerialMode = editChoice(HW_SETTINGS_COLUMN2, y, STR_AUX_SERIAL_MODES, g_eeGeneral.aux2SerialMode, 0, UART_MODE_MAX, attr, event, isAux2ModeAvailable);
         if (attr && checkIncDec_Ret) {
           aux2SerialInit(g_eeGeneral.aux2SerialMode, modelTelemetryProtocol());
         }
diff --git a/radio/src/gui/gui_common.cpp b/radio/src/gui/gui_common.cpp
index 6cbc287d2..b491d84b4 100644
--- a/radio/src/gui/gui_common.cpp
+++ b/radio/src/gui/gui_common.cpp
@@ -385,6 +385,24 @@ bool isSwitchAvailable(int swtch, SwitchContext context)
   return true;
 }
 
+bool isAux1ModeAvailable(int mode)
+{
+#if defined(AUX2_SERIAL)
+  if (mode == UART_MODE_SBUS_TRAINER)
+    return g_eeGeneral.aux2SerialMode != UART_MODE_SBUS_TRAINER;
+#endif
+  return true;
+}
+
+bool isAux2ModeAvailable(int mode)
+{
+#if defined(AUX_SERIAL)
+  if (mode == UART_MODE_SBUS_TRAINER)
+    return g_eeGeneral.auxSerialMode != UART_MODE_SBUS_TRAINER;
+#endif
+  return true;
+}
+
 bool isSwitchAvailableInLogicalSwitches(int swtch)
 {
   return isSwitchAvailable(swtch, LogicalSwitchesContext);
diff --git a/radio/src/gui/gui_common.h b/radio/src/gui/gui_common.h
index c7229f5c7..d1fdb8fa1 100644
--- a/radio/src/gui/gui_common.h
+++ b/radio/src/gui/gui_common.h
@@ -70,6 +70,8 @@ bool isSourceAvailableInGlobalFunctions(int source);
 bool isSourceAvailableInCustomSwitches(int source);
 bool isSourceAvailableInResetSpecialFunction(int index);
 bool isSourceAvailableInGlobalResetSpecialFunction(int index);
+bool isAux1ModeAvailable(int mode);
+bool isAux2ModeAvailable(int mode);
 bool isSwitchAvailableInLogicalSwitches(int swtch);
 bool isSwitchAvailableInCustomFunctions(int swtch);
 bool isSwitchAvailableInMixes(int swtch);
diff --git a/radio/src/targets/common/arm/stm32/aux_serial_driver.cpp b/radio/src/targets/common/arm/stm32/aux_serial_driver.cpp
index 88fc32cb8..e646c30d9 100644
--- a/radio/src/targets/common/arm/stm32/aux_serial_driver.cpp
+++ b/radio/src/targets/common/arm/stm32/aux_serial_driver.cpp
@@ -21,12 +21,16 @@
 #include "opentx.h"
 #include "targets/horus/board.h"
 
+#if defined(SBUS)
+extern Fifo<uint8_t, 32> trainerSbusFifo;
+#endif
+
 #if defined(AUX_SERIAL)
 uint8_t auxSerialMode = 0;
 Fifo<uint8_t, 512> auxSerialTxFifo;
 AuxSerialRxFifo auxSerialRxFifo __DMA (AUX_SERIAL_DMA_Stream_RX);
 
-void auxSerialSetup(unsigned int baudrate, bool dma)
+void auxSerialSetup(unsigned int baudrate, bool dma, uint16_t lenght = USART_WordLength_8b, uint16_t parity = USART_Parity_No, uint16_t stop = USART_StopBits_1)
 {
   USART_InitTypeDef USART_InitStructure;
   GPIO_InitTypeDef GPIO_InitStructure;
@@ -49,9 +53,9 @@ void auxSerialSetup(unsigned int baudrate, bool dma)
 #endif
 
   USART_InitStructure.USART_BaudRate = baudrate;
-  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
-  USART_InitStructure.USART_StopBits = USART_StopBits_1;
-  USART_InitStructure.USART_Parity = USART_Parity_No;
+  USART_InitStructure.USART_WordLength = lenght;
+  USART_InitStructure.USART_StopBits = stop;
+  USART_InitStructure.USART_Parity = parity;
   USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
   USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
   USART_Init(AUX_SERIAL_USART, &USART_InitStructure);
@@ -123,6 +127,11 @@ void auxSerialInit(unsigned int mode, unsigned int protocol)
       }
       break;
 
+    case UART_MODE_SBUS_TRAINER:
+      auxSerialSetup(SBUS_BAUDRATE, false, USART_WordLength_9b, USART_Parity_Even, USART_StopBits_2); // 2 stop bits requires USART_WordLength_9b
+      AUX_SERIAL_POWER_ON();
+      break;
+
     case UART_MODE_LUA:
       auxSerialSetup(DEBUG_BAUDRATE, false);
       AUX_SERIAL_POWER_ON();
@@ -144,9 +153,7 @@ void auxSerialPutc(char c)
 
 void auxSerialSbusInit()
 {
-  auxSerialSetup(SBUS_BAUDRATE, true);
-  AUX_SERIAL_USART->CR1 |= USART_CR1_M | USART_CR1_PCE ;
-  AUX_SERIAL_POWER_ON();
+  auxSerialInit(UART_MODE_SBUS_TRAINER, 0);
 }
 
 void auxSerialStop()
@@ -201,10 +208,15 @@ extern "C" void AUX_SERIAL_USART_IRQHandler(void)
   uint32_t status = AUX_SERIAL_USART->SR;
   while (status & (USART_FLAG_RXNE | USART_FLAG_ERRORS)) {
     uint8_t data = AUX_SERIAL_USART->DR;
+    UNUSED(data);
     if (!(status & USART_FLAG_ERRORS)) {
 #if defined(LUA) & !defined(CLI)
       if (luaRxFifo && auxSerialMode == UART_MODE_LUA)
         luaRxFifo->push(data);
+#endif
+#if !defined(BOOT)
+      if (auxSerialMode == UART_MODE_SBUS_TRAINER)
+        trainerSbusFifo.push(data);
 #endif
     }
     status = AUX_SERIAL_USART->SR;
@@ -218,7 +230,7 @@ uint8_t aux2SerialMode = 0;
 Fifo<uint8_t, 512> aux2SerialTxFifo;
 AuxSerialRxFifo aux2SerialRxFifo __DMA (AUX2_SERIAL_DMA_Stream_RX);
 
-void aux2SerialSetup(unsigned int baudrate, bool dma)
+void aux2SerialSetup(unsigned int baudrate, bool dma, uint16_t lenght = USART_WordLength_8b, uint16_t parity = USART_Parity_No, uint16_t stop = USART_StopBits_1)
 {
   USART_InitTypeDef USART_InitStructure;
   GPIO_InitTypeDef GPIO_InitStructure;
@@ -241,9 +253,9 @@ void aux2SerialSetup(unsigned int baudrate, bool dma)
 #endif
 
   USART_InitStructure.USART_BaudRate = baudrate;
-  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
-  USART_InitStructure.USART_StopBits = USART_StopBits_1;
-  USART_InitStructure.USART_Parity = USART_Parity_No;
+  USART_InitStructure.USART_WordLength = lenght;
+  USART_InitStructure.USART_StopBits = stop;
+  USART_InitStructure.USART_Parity = parity;
   USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
   USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
   USART_Init(AUX2_SERIAL_USART, &USART_InitStructure);
@@ -315,6 +327,11 @@ void aux2SerialInit(unsigned int mode, unsigned int protocol)
       }
       break;
 
+    case UART_MODE_SBUS_TRAINER:
+      aux2SerialSetup(SBUS_BAUDRATE, false, USART_WordLength_9b, USART_Parity_Even, USART_StopBits_2); // 2 stop bits requires USART_WordLength_9b
+      AUX2_SERIAL_POWER_ON();
+      break;
+
     case UART_MODE_LUA:
       aux2SerialSetup(DEBUG_BAUDRATE, false);
       AUX2_SERIAL_POWER_ON();
@@ -336,9 +353,7 @@ void aux2SerialPutc(char c)
 
 void aux2SerialSbusInit()
 {
-  aux2SerialSetup(SBUS_BAUDRATE, true);
-  AUX2_SERIAL_USART->CR1 |= USART_CR1_M | USART_CR1_PCE ;
-  AUX2_SERIAL_POWER_ON();
+  aux2SerialInit(UART_MODE_SBUS_TRAINER, 0);
 }
 
 void aux2SerialStop()
@@ -394,10 +409,17 @@ extern "C" void AUX2_SERIAL_USART_IRQHandler(void)
   uint32_t status = AUX2_SERIAL_USART->SR;
   while (status & (USART_FLAG_RXNE | USART_FLAG_ERRORS)) {
     uint8_t data = AUX2_SERIAL_USART->DR;
+    UNUSED(data);
     if (!(status & USART_FLAG_ERRORS)) {
-#if defined(LUA)
-      if (luaRxFifo && aux2SerialMode == UART_MODE_LUA)
+#if defined(LUA) & !defined(CLI)
+      if (luaRxFifo && aux2SerialMode == UART_MODE_LUA) {
         luaRxFifo->push(data);
+      }
+#endif
+#if !defined(BOOT)
+      if (aux2SerialMode == UART_MODE_SBUS_TRAINER) {
+        trainerSbusFifo.push(data);
+      }
 #endif
     }
     status = AUX2_SERIAL_USART->SR;
diff --git a/radio/src/targets/horus/CMakeLists.txt b/radio/src/targets/horus/CMakeLists.txt
index 20348968f..220bb5b9e 100644
--- a/radio/src/targets/horus/CMakeLists.txt
+++ b/radio/src/targets/horus/CMakeLists.txt
@@ -66,6 +66,7 @@ if (PCB STREQUAL X10)
     set(HARDWARE_TOUCH YES)
     set(USB_CHARGER YES)
     set(DEFAULT_THEME "DARKBLUE")
+    set(SBUS ON)
     set(AUX_SERIAL ON)
     if (NOT BLUETOOTH AND NOT INTERNAL_GPS)
       set(AUX2_SERIAL ON)
@@ -254,6 +255,14 @@ if (AUX2_SERIAL)
   set(AUX_SERIAL_DRIVER ../common/arm/stm32/aux_serial_driver.cpp)
 endif()
 
+if (SBUS)
+  add_definitions(-DSBUS)
+  set(SRC
+    ${SRC}
+    sbus.cpp
+    )
+endif()
+
 set(FIRMWARE_TARGET_SRC
   ${FIRMWARE_TARGET_SRC}
   ${LCD_DRIVER}
diff --git a/radio/src/targets/horus/board.h b/radio/src/targets/horus/board.h
index 0364e938f..e4e99d40f 100644
--- a/radio/src/targets/horus/board.h
+++ b/radio/src/targets/horus/board.h
@@ -197,6 +197,9 @@ void stop_trainer_ppm();
 void init_trainer_capture();
 void stop_trainer_capture();
 
+// SBUS
+int sbusGetByte(uint8_t * byte);
+
 // Keys driver
 enum EnumKeys
 {
diff --git a/radio/src/targets/horus/trainer_driver.cpp b/radio/src/targets/horus/trainer_driver.cpp
index d5b34cc1e..f039536ff 100644
--- a/radio/src/targets/horus/trainer_driver.cpp
+++ b/radio/src/targets/horus/trainer_driver.cpp
@@ -20,6 +20,10 @@
 
 #include "opentx.h"
 
+#if defined(SBUS)
+Fifo<uint8_t, 32> trainerSbusFifo;
+#endif
+
 void trainerSendNextFrame();
 
 void init_trainer_ppm()
@@ -152,3 +156,15 @@ extern "C" void TRAINER_TIMER_IRQHandler()
     trainerSendNextFrame();
   }
 }
+
+int sbusGetByte(uint8_t * byte)
+{
+  switch (currentTrainerMode) {
+#if defined(AUX_SERIAL)
+    case TRAINER_MODE_MASTER_BATTERY_COMPARTMENT:
+      return trainerSbusFifo.pop(*byte);
+#endif
+    default:
+      return false;
+  }
+}
\ No newline at end of file
diff --git a/radio/src/tasks.cpp b/radio/src/tasks.cpp
index 0e7bd7a09..533d1bb33 100644
--- a/radio/src/tasks.cpp
+++ b/radio/src/tasks.cpp
@@ -107,7 +107,7 @@ TASK_FUNCTION(mixerTask)
   s_pulses_paused = true;
 
   while (true) {
-#if defined(PCBTARANIS) && defined(SBUS)
+#if defined(SBUS) && !defined(PCBSKY9X)
     // SBUS trainer
     processSbusInput();
 #endif
diff --git a/radio/src/trainer.cpp b/radio/src/trainer.cpp
index 0af1901b7..27a237b54 100644
--- a/radio/src/trainer.cpp
+++ b/radio/src/trainer.cpp
@@ -115,9 +115,16 @@ void checkTrainerSettings()
 
 #if defined(TRAINER_BATTERY_COMPARTMENT)
       case TRAINER_MODE_MASTER_BATTERY_COMPARTMENT:
+#if defined(AUX_SERIAL)
         if (g_eeGeneral.auxSerialMode == UART_MODE_SBUS_TRAINER)
           auxSerialSbusInit();
         else
+#endif
+#if defined(AUX2_SERIAL)
+        if (g_eeGeneral.aux2SerialMode == UART_MODE_SBUS_TRAINER)
+          aux2SerialSbusInit();
+        else
+#endif
           init_trainer_capture();
         break;
 #endif