diff --git a/overlay/etc/udev/rules.d/76-et-tx500mp.rules b/overlay/etc/udev/rules.d/76-et-tx500mp.rules
new file mode 100644
index 0000000..7678a0b
--- /dev/null
+++ b/overlay/etc/udev/rules.d/76-et-tx500mp.rules
@@ -0,0 +1,31 @@
+# Author   : Gaston Gonzalez
+# Date     : 1 September 2025
+# Updated  : 2 September 2025
+# Purpose  : udev rules for the TX-500MP
+#
+# Preconditions:
+# 1. Lab599 TX-500MP (DigiRig Lite) is selected via et-radio
+# 2. Lan599 TX-500MP is connected via USB-A cable
+#
+# Postconditions:
+# 1. /dev/et-cat created
+# 2. /dev/et-audio created
+# 3. rigctld is started
+# 
+KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", PROGRAM="/opt/emcomm-tools/sbin/udev-tester.sh lab599-tx500mp", \
+    ENV{ET_DEVICE}="TX-500MP"
+
+# CAT control device will only match if PROGRAM above matches (exit status=0)
+SUBSYSTEM=="tty", ENV{ET_DEVICE}=="TX-500MP", \
+    ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001",\
+    ACTION=="add", \
+    ENV{ET_SUBDEVICE}="CAT", GROUP="dialout", MODE="0660", SYMLINK+="et-cat", \
+    RUN+="/usr/bin/systemctl start rigctld"
+
+# Audio device will only match if PROGRAM above matches (exit status=0)
+#SUBSYSTEM=="sound", ATTRS{idVendor}=="0d8c", ATTRS{idProduct}=="0016", \
+#    PROGRAM="/opt/emcomm-tools/sbin/udev-tester.sh yaesu-ftx1", \
+#    ACTION=="add", \
+#    ENV{ET_DEVICE}="FTX-1", \
+#    ATTR{id}="ET_AUDIO", \
+#    ENV{ET_SUBDEVICE}="AUDIO", GROUP="audio", MODE="0660", SYMLINK+="et-audio"
diff --git a/overlay/opt/emcomm-tools/conf/radios.d/lab599-tx500mp.json b/overlay/opt/emcomm-tools/conf/radios.d/lab599-tx500mp.json
new file mode 100644
index 0000000..bc46764
--- /dev/null
+++ b/overlay/opt/emcomm-tools/conf/radios.d/lab599-tx500mp.json
@@ -0,0 +1,21 @@
+{
+  "id": "lab599-tx500mp",
+  "vendor": "Lab599",
+  "model": "TX-500MP (DigiRig Lite)",
+  "rigctrl": {
+    "id": "2014",
+    "baud": "9600",
+    "ptt": "NONE",
+    "pttOnly": "false"
+  },
+  "notes": [
+    "1. Set MENU 36 CAT PROTOCOL = TS2000",
+    "2. Set MODE = DIGI",
+    "3. Plug-in CAT cable",
+    "4. Plug-in DigiRig Lite",
+    " * Do not enable VOX on radio"
+
+  ],
+  "fieldNotes": [
+  ]
+}
diff --git a/overlay/opt/emcomm-tools/sbin/udev-tester.sh b/overlay/opt/emcomm-tools/sbin/udev-tester.sh
index 9f60211..d3f5be7 100755
--- a/overlay/opt/emcomm-tools/sbin/udev-tester.sh
+++ b/overlay/opt/emcomm-tools/sbin/udev-tester.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 # Author  : Gaston Gonzalez
 # Date    : 11 October 2024
-# Updated : 21 May 2025
+# Updated : 1 September 2025
 # Purpose : Perform tests that can be used by the udev subsystem to aid
 #           in rule development. This is intended to by used with the PROGRAM
 #           directive inside of a udev rule.
@@ -13,6 +13,20 @@
 ET_HOME=/opt/emcomm-tools
 ACTIVE_RADIO="${ET_HOME}/conf/radios.d/active-radio.json"
 
+# Exit with a 0 exit status if, and only if, the currently selected radio is
+# a Lab599 TX-500MP.
+test_lab599_tx500mp() {
+  if [[ -L "${ET_HOME}/conf/radios.d/active-radio.json" ]]; then
+    ID=$(cat "${ET_HOME}/conf/radios.d/active-radio.json" | jq -r .id)
+
+    if [[ "$ID" == "lab599-tx500mp" ]]; then
+      exit 0
+    fi
+  fi
+  
+  exit 1
+}
+
 # Exit with a 0 exit status if, and only if, the currently selected radio is
 # a Yaesu FTX-1.
 test_yaesu_ftx1() {
@@ -107,6 +121,13 @@ case $1 in
   ;;
   digirig-mobile)
     test_digirig_mobile
+  ;;
+  lab599-tx500mp)
+    test_lab599_tx500mp
+  ;;
+  *)
+    echo "$1 is not supported."
+  ;;
 esac
 
 exit 1