diff --git a/ohmpi/hardware_components/mb_2023_0_X.py b/ohmpi/hardware_components/mb_2023_0_X.py
index 5bcdff0445f3d1f1395978645a2c310d51e35a6c..4a286a2b330df819ff5d93abf27ec8b03777eb33 100644
--- a/ohmpi/hardware_components/mb_2023_0_X.py
+++ b/ohmpi/hardware_components/mb_2023_0_X.py
@@ -164,6 +164,7 @@ class Tx(TxAbstract):
         print(f'asserted polarity: {self.polarity}')
 
         if polarity == 1:
+            print('pin0')
             self.pin0.value = True
             self.pin1.value = False
             time.sleep(self._activation_delay)