diff --git a/Marlin/src/config/default/Configuration.h b/Marlin/src/config/default/Configuration.h
index 7601dd65a3..4e674e97c4 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 eebbe77994..39c3c7686b 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 b64643537c..80a4b58272 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 feec3b2c10..f3f395a8b8 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 d352828a73..28e603495a 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 bdbd3be4c0..0bba68b402 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 4cf6844c05..fd01fabbf8 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 d0378cdddc..6e1a085f3d 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 1fcc1f8b6a..003182abf8 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 c7ade6ee6d..b731a518df 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 1719f0846a..6cd5fa26aa 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 052a16779c..1cee114012 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 83a6ab34fe..4492e0747e 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 dafd79109f..d5a2270539 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 9f2c25d385..7d3a4f56e5 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 2a7033879d..be5270596f 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 ee4c0b0884..d461f760aa 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 b247802edf..420b3bdf13 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 d5bcd1a582..6d8c0de1a3 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 90018c4f14..4238c4b3f5 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 c99d9af893..e6e5e6e80a 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 6e4b8f718f..37b41a311b 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 4b4219e986..33ef0803af 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 4b364e67d1..0e1f4d589c 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 bebd2ff553..659d81d519 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 8f90e4f9a0..59163521a8 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 645f94e17f..0e0176175f 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 086060e4f0..e81a48edbd 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 f6d8efa009..6e8e448fc5 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 2d03ef33ca..298188ff4f 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 e01bd065ca..2a735c100e 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 f623b8a14e..ddbd140b58 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 316494b72e..86bd299a63 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 4c53d21072..4d8cbc63dd 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 b48db2a4e1..9d4e7ea587 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 84695b0a64..24190541ea 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 4fb53477dc..bf6f22ebe9 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 bca4e3a2a3..c530d79349 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 e3dd1c2b71..fa47d8a794 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 6e3c385424..41c6914861 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 69f6815b3d..f1bef4b46c 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.
  *