diff --git a/config/machine_settings/defaults.ini b/config/machine_settings/defaults.ini
index 911da11..38347cc 100644
--- a/config/machine_settings/defaults.ini
+++ b/config/machine_settings/defaults.ini
@@ -34,6 +34,9 @@ printer:
 [tecna_t3]
 port: COM3
 baudrate: 115200
+admin_pin: 603
+modify_pin: 603
+select_pin: 603
 
 [neo_pixels]
 port: COM1
diff --git a/src/components/tecna_marposs_provaset_t3.py b/src/components/tecna_marposs_provaset_t3.py
index f647b55..62e2048 100644
--- a/src/components/tecna_marposs_provaset_t3.py
+++ b/src/components/tecna_marposs_provaset_t3.py
@@ -12,12 +12,32 @@ class TecnaMarpossProvasetT3(ModbusComponent):
     def __init__(self, config=None, name=None, period=1, lazy=True, paused=False, threaded=True):
         super().__init__(config=config, name=name, period=period, lazy=lazy, paused=paused, threaded=threaded, registers=registers)
 
+    pin_registers = {
+        "admin_pin": "PASSWORD: Administrator",  # was 1909
+        "modify_pin": "PASSWORD: Modify program",  # was 0
+        "select_pin": "PASSWORD: Select program",  # was 0
+    }
+
     def config_changed(self):
         super().config_changed()
-        # self.set_measure_units()
+        self.pins = {
+            "admin_pin": self.config.get("admin_pin", None),
+            "modify_pin": self.config.get("modify_pin", None),
+            "select_pin": self.config.get("select_pin", None),
+        }
+        self.unlock_tecna()
+        self.set_measure_units()
         self.units = self.get_measure_units()
         self.log.info(f"units: {self.units}")
 
+    def unlock_tecna(self, **kwargs):
+        pins = self.pins.copy()
+        pins.update(kwargs)
+        for pin_name, register in self.pin_registers.items():
+            pin = pins[pin_name]
+            if pin is not None:
+                self.write(register, pin)
+
     _pressure_units = {"mH2O": 0, "mbar": 1, "kPa": 2, "mmHg": 3, "inH2O": 4, "psi": 5, "mmH2O": 6, }   # (se fondoscala <=6 bar)
     _leak_units = {"mmH2O": 0, "mbar": 1, "Pa": 2, "mmHg": 3, "inH2O": 4, "psi": 5, }
     _leak_flow_units = {"cm3/min": 0, "cm3/h": 1, }
@@ -133,9 +153,6 @@ class TecnaMarpossProvasetT3(ModbusComponent):
         recipe_name = recipe.spec["part_number"][:16].encode("ascii")
         recipe_name += b"\x00" * (16 - len(recipe_name))
         recipe = {
-            "PASSWORD: Administrator": 603,  # was 1909
-            "PASSWORD: Modify program": 603,  # was 0
-            "PASSWORD: Select program": 603,  # was 0
             "INSTRUMENT SETTING: Various flags": 0b0000000000000000,
             **{719 + i: (recipe_name[i * 2 + 1] << 8) + recipe_name[i * 2] for i in range(8)},
             "Selection number of test table on which you intend to work": table,