diff --git a/Marlin/src/config/default/Configuration.h b/Marlin/src/config/default/Configuration.h
index 7601dd65a..4e674e97c 100644
--- a/Marlin/src/config/default/Configuration.h
+++ b/Marlin/src/config/default/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/AlephObjects/TAZ4/Configuration.h b/Marlin/src/config/examples/AlephObjects/TAZ4/Configuration.h
index eebbe7799..39c3c7686 100644
--- a/Marlin/src/config/examples/AlephObjects/TAZ4/Configuration.h
+++ b/Marlin/src/config/examples/AlephObjects/TAZ4/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/AliExpress/CL-260/Configuration.h b/Marlin/src/config/examples/AliExpress/CL-260/Configuration.h
index b64643537..80a4b5827 100644
--- a/Marlin/src/config/examples/AliExpress/CL-260/Configuration.h
+++ b/Marlin/src/config/examples/AliExpress/CL-260/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Anet/A6/Configuration.h b/Marlin/src/config/examples/Anet/A6/Configuration.h
index feec3b2c1..f3f395a8b 100644
--- a/Marlin/src/config/examples/Anet/A6/Configuration.h
+++ b/Marlin/src/config/examples/Anet/A6/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Anet/A8/Configuration.h b/Marlin/src/config/examples/Anet/A8/Configuration.h
index d352828a7..28e603495 100644
--- a/Marlin/src/config/examples/Anet/A8/Configuration.h
+++ b/Marlin/src/config/examples/Anet/A8/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Azteeg/X5GT/Configuration.h b/Marlin/src/config/examples/Azteeg/X5GT/Configuration.h
index bdbd3be4c..0bba68b40 100644
--- a/Marlin/src/config/examples/Azteeg/X5GT/Configuration.h
+++ b/Marlin/src/config/examples/Azteeg/X5GT/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/BQ/Hephestos/Configuration.h b/Marlin/src/config/examples/BQ/Hephestos/Configuration.h
index 4cf6844c0..fd01fabbf 100644
--- a/Marlin/src/config/examples/BQ/Hephestos/Configuration.h
+++ b/Marlin/src/config/examples/BQ/Hephestos/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/BQ/Hephestos_2/Configuration.h b/Marlin/src/config/examples/BQ/Hephestos_2/Configuration.h
index d0378cddd..6e1a085f3 100644
--- a/Marlin/src/config/examples/BQ/Hephestos_2/Configuration.h
+++ b/Marlin/src/config/examples/BQ/Hephestos_2/Configuration.h
@@ -101,6 +101,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/BQ/WITBOX/Configuration.h b/Marlin/src/config/examples/BQ/WITBOX/Configuration.h
index 1fcc1f8b6..003182abf 100644
--- a/Marlin/src/config/examples/BQ/WITBOX/Configuration.h
+++ b/Marlin/src/config/examples/BQ/WITBOX/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Cartesio/Configuration.h b/Marlin/src/config/examples/Cartesio/Configuration.h
index c7ade6ee6..b731a518d 100644
--- a/Marlin/src/config/examples/Cartesio/Configuration.h
+++ b/Marlin/src/config/examples/Cartesio/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Creality/CR-10/Configuration.h b/Marlin/src/config/examples/Creality/CR-10/Configuration.h
index 1719f0846..6cd5fa26a 100755
--- a/Marlin/src/config/examples/Creality/CR-10/Configuration.h
+++ b/Marlin/src/config/examples/Creality/CR-10/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Felix/Configuration.h b/Marlin/src/config/examples/Felix/Configuration.h
index 052a16779..1cee11401 100644
--- a/Marlin/src/config/examples/Felix/Configuration.h
+++ b/Marlin/src/config/examples/Felix/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Felix/DUAL/Configuration.h b/Marlin/src/config/examples/Felix/DUAL/Configuration.h
index 83a6ab34f..4492e0747 100644
--- a/Marlin/src/config/examples/Felix/DUAL/Configuration.h
+++ b/Marlin/src/config/examples/Felix/DUAL/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/FolgerTech/i3-2020/Configuration.h b/Marlin/src/config/examples/FolgerTech/i3-2020/Configuration.h
index dafd79109..d5a227053 100644
--- a/Marlin/src/config/examples/FolgerTech/i3-2020/Configuration.h
+++ b/Marlin/src/config/examples/FolgerTech/i3-2020/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Geeetech/GT2560/Configuration.h b/Marlin/src/config/examples/Geeetech/GT2560/Configuration.h
index 9f2c25d38..7d3a4f56e 100644
--- a/Marlin/src/config/examples/Geeetech/GT2560/Configuration.h
+++ b/Marlin/src/config/examples/Geeetech/GT2560/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Geeetech/I3_Pro_X-GT2560/Configuration.h b/Marlin/src/config/examples/Geeetech/I3_Pro_X-GT2560/Configuration.h
index 2a7033879..be5270596 100644
--- a/Marlin/src/config/examples/Geeetech/I3_Pro_X-GT2560/Configuration.h
+++ b/Marlin/src/config/examples/Geeetech/I3_Pro_X-GT2560/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Infitary/i3-M508/Configuration.h b/Marlin/src/config/examples/Infitary/i3-M508/Configuration.h
index ee4c0b088..d461f760a 100644
--- a/Marlin/src/config/examples/Infitary/i3-M508/Configuration.h
+++ b/Marlin/src/config/examples/Infitary/i3-M508/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Malyan/M150/Configuration.h b/Marlin/src/config/examples/Malyan/M150/Configuration.h
index b247802ed..420b3bdf1 100644
--- a/Marlin/src/config/examples/Malyan/M150/Configuration.h
+++ b/Marlin/src/config/examples/Malyan/M150/Configuration.h
@@ -107,6 +107,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Micromake/C1/basic/Configuration.h b/Marlin/src/config/examples/Micromake/C1/basic/Configuration.h
index d5bcd1a58..6d8c0de1a 100644
--- a/Marlin/src/config/examples/Micromake/C1/basic/Configuration.h
+++ b/Marlin/src/config/examples/Micromake/C1/basic/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Micromake/C1/enhanced/Configuration.h b/Marlin/src/config/examples/Micromake/C1/enhanced/Configuration.h
index 90018c4f1..4238c4b3f 100644
--- a/Marlin/src/config/examples/Micromake/C1/enhanced/Configuration.h
+++ b/Marlin/src/config/examples/Micromake/C1/enhanced/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Mks/Sbase/Configuration.h b/Marlin/src/config/examples/Mks/Sbase/Configuration.h
index c99d9af89..e6e5e6e80 100644
--- a/Marlin/src/config/examples/Mks/Sbase/Configuration.h
+++ b/Marlin/src/config/examples/Mks/Sbase/Configuration.h
@@ -101,7 +101,16 @@
  *
  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
  */
-#define SERIAL_PORT -1
+#define SERIAL_PORT 0
+
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
 
 /**
  * This setting determines the communication speed of the printer.
diff --git a/Marlin/src/config/examples/RepRapWorld/Megatronics/Configuration.h b/Marlin/src/config/examples/RepRapWorld/Megatronics/Configuration.h
index 6e4b8f718..37b41a311 100644
--- a/Marlin/src/config/examples/RepRapWorld/Megatronics/Configuration.h
+++ b/Marlin/src/config/examples/RepRapWorld/Megatronics/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/RigidBot/Configuration.h b/Marlin/src/config/examples/RigidBot/Configuration.h
index 4b4219e98..33ef0803a 100644
--- a/Marlin/src/config/examples/RigidBot/Configuration.h
+++ b/Marlin/src/config/examples/RigidBot/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/SCARA/Configuration.h b/Marlin/src/config/examples/SCARA/Configuration.h
index 4b364e67d..0e1f4d589 100644
--- a/Marlin/src/config/examples/SCARA/Configuration.h
+++ b/Marlin/src/config/examples/SCARA/Configuration.h
@@ -132,6 +132,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/STM32F10/Configuration.h b/Marlin/src/config/examples/STM32F10/Configuration.h
index bebd2ff55..659d81d51 100644
--- a/Marlin/src/config/examples/STM32F10/Configuration.h
+++ b/Marlin/src/config/examples/STM32F10/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Sanguinololu/Configuration.h b/Marlin/src/config/examples/Sanguinololu/Configuration.h
index 8f90e4f9a..59163521a 100644
--- a/Marlin/src/config/examples/Sanguinololu/Configuration.h
+++ b/Marlin/src/config/examples/Sanguinololu/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/TinyBoy2/Configuration.h b/Marlin/src/config/examples/TinyBoy2/Configuration.h
index 645f94e17..0e0176175 100644
--- a/Marlin/src/config/examples/TinyBoy2/Configuration.h
+++ b/Marlin/src/config/examples/TinyBoy2/Configuration.h
@@ -118,6 +118,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Velleman/K8200/Configuration.h b/Marlin/src/config/examples/Velleman/K8200/Configuration.h
index 086060e4f..e81a48edb 100644
--- a/Marlin/src/config/examples/Velleman/K8200/Configuration.h
+++ b/Marlin/src/config/examples/Velleman/K8200/Configuration.h
@@ -118,6 +118,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Velleman/K8400/Configuration.h b/Marlin/src/config/examples/Velleman/K8400/Configuration.h
index f6d8efa00..6e8e448fc 100644
--- a/Marlin/src/config/examples/Velleman/K8400/Configuration.h
+++ b/Marlin/src/config/examples/Velleman/K8400/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/Velleman/K8400/Dual-head/Configuration.h b/Marlin/src/config/examples/Velleman/K8400/Dual-head/Configuration.h
index 2d03ef33c..298188ff4 100644
--- a/Marlin/src/config/examples/Velleman/K8400/Dual-head/Configuration.h
+++ b/Marlin/src/config/examples/Velleman/K8400/Dual-head/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/adafruit/ST7565/Configuration.h b/Marlin/src/config/examples/adafruit/ST7565/Configuration.h
index e01bd065c..2a735c100 100644
--- a/Marlin/src/config/examples/adafruit/ST7565/Configuration.h
+++ b/Marlin/src/config/examples/adafruit/ST7565/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/delta/FLSUN/auto_calibrate/Configuration.h b/Marlin/src/config/examples/delta/FLSUN/auto_calibrate/Configuration.h
index f623b8a14..ddbd140b5 100644
--- a/Marlin/src/config/examples/delta/FLSUN/auto_calibrate/Configuration.h
+++ b/Marlin/src/config/examples/delta/FLSUN/auto_calibrate/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/delta/FLSUN/kossel_mini/Configuration.h b/Marlin/src/config/examples/delta/FLSUN/kossel_mini/Configuration.h
index 316494b72..86bd299a6 100644
--- a/Marlin/src/config/examples/delta/FLSUN/kossel_mini/Configuration.h
+++ b/Marlin/src/config/examples/delta/FLSUN/kossel_mini/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/delta/generic/Configuration.h b/Marlin/src/config/examples/delta/generic/Configuration.h
index 4c53d2107..4d8cbc63d 100644
--- a/Marlin/src/config/examples/delta/generic/Configuration.h
+++ b/Marlin/src/config/examples/delta/generic/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/delta/kossel_mini/Configuration.h b/Marlin/src/config/examples/delta/kossel_mini/Configuration.h
index b48db2a4e..9d4e7ea58 100644
--- a/Marlin/src/config/examples/delta/kossel_mini/Configuration.h
+++ b/Marlin/src/config/examples/delta/kossel_mini/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/delta/kossel_pro/Configuration.h b/Marlin/src/config/examples/delta/kossel_pro/Configuration.h
index 84695b0a6..24190541e 100644
--- a/Marlin/src/config/examples/delta/kossel_pro/Configuration.h
+++ b/Marlin/src/config/examples/delta/kossel_pro/Configuration.h
@@ -106,6 +106,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/delta/kossel_xl/Configuration.h b/Marlin/src/config/examples/delta/kossel_xl/Configuration.h
index 4fb53477d..bf6f22ebe 100644
--- a/Marlin/src/config/examples/delta/kossel_xl/Configuration.h
+++ b/Marlin/src/config/examples/delta/kossel_xl/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/gCreate/gMax1.5+/Configuration.h b/Marlin/src/config/examples/gCreate/gMax1.5+/Configuration.h
index bca4e3a2a..c530d7934 100644
--- a/Marlin/src/config/examples/gCreate/gMax1.5+/Configuration.h
+++ b/Marlin/src/config/examples/gCreate/gMax1.5+/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/makibox/Configuration.h b/Marlin/src/config/examples/makibox/Configuration.h
index e3dd1c2b7..fa47d8a79 100644
--- a/Marlin/src/config/examples/makibox/Configuration.h
+++ b/Marlin/src/config/examples/makibox/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/tvrrug/Round2/Configuration.h b/Marlin/src/config/examples/tvrrug/Round2/Configuration.h
index 6e3c38542..41c691486 100644
--- a/Marlin/src/config/examples/tvrrug/Round2/Configuration.h
+++ b/Marlin/src/config/examples/tvrrug/Round2/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *
diff --git a/Marlin/src/config/examples/wt150/Configuration.h b/Marlin/src/config/examples/wt150/Configuration.h
index 69f6815b3..f1bef4b46 100644
--- a/Marlin/src/config/examples/wt150/Configuration.h
+++ b/Marlin/src/config/examples/wt150/Configuration.h
@@ -102,6 +102,15 @@
  */
 #define SERIAL_PORT 0
 
+/**
+  * Select a secondary serial port on the board to use for communication with the host.
+  * This allows the connection of wireless adapters (for instance) to non-default port pins.
+  * Serial port -1 is the USB emulated serial port, if avaialble.
+  *
+  * :[-1, 0, 1, 2, 3, 4, 5, 6, 7]
+  */
+#define SERIAL_PORT_2 -1
+
 /**
  * This setting determines the communication speed of the printer.
  *