diff --git a/esp3d/src/core/commands/ESP420.cpp b/esp3d/src/core/commands/ESP420.cpp
index aa5f39b9..0d8f4511 100644
--- a/esp3d/src/core/commands/ESP420.cpp
+++ b/esp3d/src/core/commands/ESP420.cpp
@@ -588,13 +588,34 @@ void ESP3DCommands::ESP420(int cmd_params_pos, ESP3DMessage* msg) {
 
 #if COMMUNICATION_PROTOCOL == RAW_SERIAL || COMMUNICATION_PROTOCOL == MKS_SERIAL
   // serial enabled
-  tmpstr = (esp3d_serial_service.started()) ? "ON" : "OFF";
+  if (esp3d_serial_service.started()) {
+ tmpstr = "ON (UART";
+    tmpstr += esp3d_serial_service.serialIndex();
+    tmpstr += ")";
+  } else {
+    tmpstr = "OFF";
+  }
   if (!dispatchIdValue(json, "serial", tmpstr.c_str(), target, requestId,
                        false)) {
     return;
   }
 #endif  // COMMUNICATION_PROTOCOL == RAW_SERIAL || COMMUNICATION_PROTOCOL ==
         // MKS_SERIAL
+#if defined (ESP_SERIAL_BRIDGE_OUTPUT)
+  // serial bridge enabled
+  if (serial_bridge_service.started()) {
+    tmpstr = "ON (UART";
+    tmpstr += serial_bridge_service.serialIndex();
+    tmpstr += ")";
+  } else {
+    tmpstr = "OFF";
+  }
+    if (!dispatchIdValue(json, "serial_bridge", tmpstr.c_str(), target, requestId,
+                       false)) {
+    return;
+  } 
+#endif // ESP_SERIAL_BRIDGE_OUTPUT
+
 #if defined(AUTHENTICATION_FEATURE)
   // authentication enabled
   tmpstr = "ON";