diff --git a/test/serial/mb_serial_master/main/Kconfig.projbuild b/test/serial/mb_serial_master/main/Kconfig.projbuild
index eae846f..3d9f150 100644
--- a/test/serial/mb_serial_master/main/Kconfig.projbuild
+++ b/test/serial/mb_serial_master/main/Kconfig.projbuild
@@ -4,8 +4,8 @@ menu "Modbus Example Configuration"
         int "UART port number"
         range 0 2 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32S3
         default 2 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32S3
-        range 0 1 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32C3 || IDF_TARGET_ESP32C2
-        default 1 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32C3 || IDF_TARGET_ESP32C2
+        range 0 1 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32C3 || IDF_TARGET_ESP32C2 || IDF_TARGET_ESP32C6
+        default 1 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32C3 || IDF_TARGET_ESP32C2 || IDF_TARGET_ESP32C6
         help
             UART communication port number for Modbus example.
 
@@ -19,7 +19,8 @@ menu "Modbus Example Configuration"
     config MB_UART_RXD
         int "UART RXD pin number"
         range 0 34 if IDF_TARGET_ESP32
-        default 22 if IDF_TARGET_ESP32
+        range 0 23 if IDF_TARGET_ESP32C6
+        default 22 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32C6
         range 0 46 if IDF_TARGET_ESP32S2
         range 0 47 if IDF_TARGET_ESP32S3
         range 0 19 if IDF_TARGET_ESP32C3
@@ -32,7 +33,8 @@ menu "Modbus Example Configuration"
     config MB_UART_TXD
         int "UART TXD pin number"
         range 0 34 if IDF_TARGET_ESP32
-        default 23 if IDF_TARGET_ESP32
+        range 0 23 if IDF_TARGET_ESP32C6
+        default 23 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32C6
         range 0 46 if IDF_TARGET_ESP32S2
         range 0 47 if IDF_TARGET_ESP32S3
         range 0 19 if IDF_TARGET_ESP32C3
@@ -45,7 +47,8 @@ menu "Modbus Example Configuration"
     config MB_UART_RTS
         int "UART RTS pin number"
         range 0 34 if IDF_TARGET_ESP32
-        default 18 if IDF_TARGET_ESP32
+        range 0 23 if IDF_TARGET_ESP32C6
+        default 18 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32C6
         range 0 46 if IDF_TARGET_ESP32S2
         range 0 47 if IDF_TARGET_ESP32S3
         range 0 19 if IDF_TARGET_ESP32C3
diff --git a/test/serial/mb_serial_slave/main/Kconfig.projbuild b/test/serial/mb_serial_slave/main/Kconfig.projbuild
index b249c4e..d661d2b 100644
--- a/test/serial/mb_serial_slave/main/Kconfig.projbuild
+++ b/test/serial/mb_serial_slave/main/Kconfig.projbuild
@@ -4,8 +4,8 @@ menu "Modbus Example Configuration"
         int "UART port number"
         range 0 2 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32S3
         default 2 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32S3
-        range 0 1 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32C3 || IDF_TARGET_ESP32C2
-        default 1 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32C3 || IDF_TARGET_ESP32C2
+        range 0 1 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32C3 || IDF_TARGET_ESP32C2 || IDF_TARGET_ESP32C6
+        default 1 if IDF_TARGET_ESP32S2 || IDF_TARGET_ESP32C3 || IDF_TARGET_ESP32C2 || IDF_TARGET_ESP32C6
         help
             UART communication port number for Modbus example.
 
@@ -19,7 +19,8 @@ menu "Modbus Example Configuration"
     config MB_UART_RXD
         int "UART RXD pin number"
         range 0 34 if IDF_TARGET_ESP32
-        default 22 if IDF_TARGET_ESP32
+        range 0 23 if IDF_TARGET_ESP32C6
+        default 22 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32C6
         range 0 46 if IDF_TARGET_ESP32S2
         range 0 47 if IDF_TARGET_ESP32S3
         range 0 19 if IDF_TARGET_ESP32C3
@@ -32,7 +33,8 @@ menu "Modbus Example Configuration"
     config MB_UART_TXD
         int "UART TXD pin number"
         range 0 34 if IDF_TARGET_ESP32
-        default 23 if IDF_TARGET_ESP32
+        range 0 23 if IDF_TARGET_ESP32C6
+        default 23 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32C6
         range 0 46 if IDF_TARGET_ESP32S2
         range 0 47 if IDF_TARGET_ESP32S3
         range 0 19 if IDF_TARGET_ESP32C3
@@ -45,7 +47,8 @@ menu "Modbus Example Configuration"
     config MB_UART_RTS
         int "UART RTS pin number"
         range 0 34 if IDF_TARGET_ESP32
-        default 18 if IDF_TARGET_ESP32
+        range 0 23 if IDF_TARGET_ESP32C6
+        default 18 if IDF_TARGET_ESP32 || IDF_TARGET_ESP32C6
         range 0 46 if IDF_TARGET_ESP32S2
         range 0 47 if IDF_TARGET_ESP32S3
         range 0 19 if IDF_TARGET_ESP32C3