diff --git a/Kconfig b/Kconfig
index b4bf38f..205ff31 100644
--- a/Kconfig
+++ b/Kconfig
@@ -15,7 +15,11 @@ menu "WebGUIApp"
     config BOARD_HARDWARE_REVISION
 		int "Board hardware revision"
     	range 1 5
-    	default 1	
+    	default 1
+    
+    config BOARD_HARDWARE_OPTION
+		string "Board hardware option"
+    	default "Base version"
     	
     config APP_PROJECT_VER
         string "Device firmware version"
@@ -814,6 +818,19 @@ menu "WebGUIApp"
 	        		help
 	            		Switch on bridge uart to mqtt, else uart operate same way as rest and mqtt data exchange         
 	        
+	   		choice WEBGUIAPP_UART_MODE
+	            prompt "Serial port mode"
+	            default WEBGUIAPP_UART_MODE_UART
+	            help
+	                Select serial port mode.
+	            
+	            config WEBGUIAPP_UART_MODE_UART
+	                bool "UART"
+	            
+	            config WEBGUIAPP_UART_MODE_RS485
+	                bool "RS485"
+            endchoice 
+	        
 	        config WEBGUIAPP_UART_BAUD_RATE
 	            int "UART communication speed"
 	            range 1200 115200
diff --git a/src/RestApiHandler.c b/src/RestApiHandler.c
index 3efb386..c0415a6 100644
--- a/src/RestApiHandler.c
+++ b/src/RestApiHandler.c
@@ -326,6 +326,17 @@ static void funct_cronrecs(char *argres, int rw)
 
 //CRON implementation END
 
+static void funct_serial_mode(char *argres, int rw)
+{
+
+#ifdef CONFIG_WEBGUIAPP_UART_MODE_UART
+    snprintf(argres, VAR_MAX_VALUE_LENGTH, "\"UART\"");
+#elif  CONFIG_WEBGUIAPP_UART_MODE_RS485
+    snprintf(argres, VAR_MAX_VALUE_LENGTH, "\"RS485\"");
+#endif
+
+}
+
 
 static void funct_objsinfo(char *argres, int rw)
 {
@@ -360,6 +371,7 @@ const rest_var_t SystemVariables[] =
 
                 { 0, "model_name", CONFIG_DEVICE_MODEL_NAME, VAR_STRING, R, 1, 64 },
                 { 0, "hw_rev", ((int*) &hw_rev), VAR_INT, R, 1, 1024 },
+                { 0, "hw_opt", CONFIG_BOARD_HARDWARE_OPTION, VAR_STRING, R, 1, 256 },
                 { 0, "build_date", CONFIG_DEVICE_MODEL_NAME, VAR_STRING, R, 1, 64 },
                 { 0, "model_name", CONFIG_DEVICE_MODEL_NAME, VAR_STRING, R, 1, 64 },
 
@@ -481,7 +493,7 @@ const rest_var_t SystemVariables[] =
 #ifdef CONFIG_WEBGUIAPP_UART_TRANSPORT_ENABLE
                 { 0, "serial_enab", &SysConfig.serialSettings.Flags.IsSerialEnabled, VAR_BOOL, RW, 0, 1 },
                 { 0, "serial_bridge", &SysConfig.serialSettings.Flags.IsBridgeEnabled, VAR_BOOL, RW, 0, 1 },
-                { 0, "serial_mode", &SysConfig.serialSettings.Serialmode, VAR_INT, RW, 1, 2 },
+                { 0, "serial_mode", &funct_serial_mode, VAR_FUNCT, R, 1, 2 },
                 { 0, "serial_baud", &SysConfig.serialSettings.BaudRate, VAR_INT, RW, 1200, 4096000 },
                 { 0, "serial_break", &SysConfig.serialSettings.InputBrake, VAR_INT, RW, 1, 50 },
                 { 0, "serial_visible", (bool*) (&VAR_TRUE), VAR_BOOL, R, 0, 1 },
diff --git a/src/SerialPort.c b/src/SerialPort.c
index 0fd32a6..59d7416 100644
--- a/src/SerialPort.c
+++ b/src/SerialPort.c
@@ -35,6 +35,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include "webguiapp.h"
+#include "driver/gpio.h"
 
 #define TAG "serial_port"
 #define UART_READ_TOUT          (100) // 3.5T * 8 = 28 ticks, TOUT=3 -> ~24..33 ticks
@@ -243,10 +244,11 @@ void InitSerialPort(void)
     ESP_ERROR_CHECK(uart_set_pin(CONFIG_WEBGUIAPP_UART_PORT_NUM,
                     CONFIG_WEBGUIAPP_UART_TXD, CONFIG_WEBGUIAPP_UART_RXD, CONFIG_WEBGUIAPP_UART_RTS, -1));
 
-    if (GetSysConf()->serialSettings.Serialmode == 2)
-        ESP_ERROR_CHECK(uart_set_mode(CONFIG_WEBGUIAPP_UART_PORT_NUM, UART_MODE_RS485_HALF_DUPLEX));
-    else
-        ESP_ERROR_CHECK(uart_set_mode(CONFIG_WEBGUIAPP_UART_PORT_NUM, UART_MODE_UART));
+#ifdef CONFIG_WEBGUIAPP_UART_MODE_UART
+    ESP_ERROR_CHECK(uart_set_mode(CONFIG_WEBGUIAPP_UART_PORT_NUM, UART_MODE_UART));
+#elif  CONFIG_WEBGUIAPP_UART_MODE_RS485
+    ESP_ERROR_CHECK(uart_set_mode(CONFIG_WEBGUIAPP_UART_PORT_NUM, UART_MODE_RS485_HALF_DUPLEX));
+#endif
 
     ESP_ERROR_CHECK(uart_enable_rx_intr(CONFIG_WEBGUIAPP_UART_PORT_NUM));
     ESP_ERROR_CHECK(uart_set_rx_timeout(CONFIG_WEBGUIAPP_UART_PORT_NUM, UART_READ_TOUT));