diff --git a/TestEnvironment/scripts/GRIFO_M_PBIT.py b/TestEnvironment/scripts/GRIFO_M_PBIT.py
index 96d5015..aa8d25d 100644
--- a/TestEnvironment/scripts/GRIFO_M_PBIT.py
+++ b/TestEnvironment/scripts/GRIFO_M_PBIT.py
@@ -71,6 +71,10 @@ TELLBACK_VERIFY_STEP_SEC = 0.5    # Poll step for tellback verification
 TELLBACK_POST_SET_DELAY_SEC = 2.0  # Delay after setting STBY/SILENCE to allow radar to update tellbacks
 STBY_POST_UNSET_DELAY_SEC = 2.0    # Delay after removing STBY to allow radar to exit standby
 
+# Global flag: enable auxiliary serial helper by default (can be overridden by operator)
+# Set to False to disable auxiliary serial communication from tests.
+ENABLE_AUX_SERIAL = True
+
 # ====================
 # B8 DRILL-DOWN CONFIGURATION
 # ====================
@@ -1595,8 +1599,8 @@ def test_proc():
                     # Prepare radar for operational target acquisition (best-effort)
                     try:
                         logging.info("Setting radar to operational mode before target test (best-effort)")
-                        # Execute auxiliary serial sequence to prepare radar (if configured)
-                        if send_serial_sequence:
+                        # Execute auxiliary serial sequence to prepare radar (if configured and enabled)
+                        if send_serial_sequence and ENABLE_AUX_SERIAL:
                             try:
                                 logging.info('Executing auxiliary serial sequence to prepare radar')
                                 send_serial_sequence()