diff --git a/ubitx_20/cat_libs.ino b/ubitx_20/cat_libs.ino
index d6455e3..e59f31c 100644
--- a/ubitx_20/cat_libs.ino
+++ b/ubitx_20/cat_libs.ino
@@ -884,7 +884,7 @@ void Check_Cat(byte fromType)
   isProcessCheck_Cat = 1; 
 
   if (readPrefix == IOP_PREFIX) {
-    recvIOPMessage(msg, CAT_BUFF, 5); // not super robust... if IOP ever sends more than a 5 (6) byte message
+    recvIOPMessage(msg, CAT_BUFF, 5); // not super robust... if IOP ever sends more (or less) than a 5 (6) byte message
     // following assumes it's a status message, 4 chars (including trailing null, which I'm ignoring...
     switch(msg.id) {
       case IOP_SSB_STATUS_MSG:
@@ -897,6 +897,10 @@ void Check_Cat(byte fromType)
       displaySmeter = false;
       delaySmeter = millis() + SMETER_DELAY_TIME;
       break;
+
+      case IOP_MODE_REQUEST:
+      iopSendMode(cwMode, isUSB, digiMode, isTest);
+      break;
     }
     
   } else if (readPrefix == CAT_PREFIX) {