diff --git a/hardware/abstract_hardware.py b/hardware/abstract_hardware.py
index 9db4a787a2a3a3dba7e3c093096ff9b89292648d..0cae00605ec403df717b8c37b7ab40743645612e 100644
--- a/hardware/abstract_hardware.py
+++ b/hardware/abstract_hardware.py
@@ -16,6 +16,7 @@ class TxAbstract(ABC):
         polarity = kwargs.pop('polarity', 1)
         if polarity is None:
             polarity = 0
+        self._polarity = polarity
         print(f'polarity: {polarity}')  # TODO: delete me
         inj_time = kwargs.pop('inj_time', 1.)
         self.exec_logger = kwargs.pop('exec_logger', None)