diff --git a/apps/abstraction/vendors/hottis_pv_modbus.py b/apps/abstraction/vendors/hottis_pv_modbus.py
index 772ae1a..ecc423f 100644
--- a/apps/abstraction/vendors/hottis_pv_modbus.py
+++ b/apps/abstraction/vendors/hottis_pv_modbus.py
@@ -127,4 +127,8 @@ HANDLERS = {
     ("relay", "to_abstract"): transform_relay_to_abstract,
     ("three_phase_powermeter", "to_vendor"): transform_three_phase_powermeter_to_vendor,
     ("three_phase_powermeter", "to_abstract"): transform_three_phase_powermeter_to_abstract,
+    ("contact_sensor", "to_vendor"): transform_contact_sensor_to_vendor,
+    ("contact_sensor", "to_abstract"): transform_contact_sensor_to_abstract,
+    ("contact", "to_vendor"): transform_contact_sensor_to_vendor,
+    ("contact", "to_abstract"): transform_contact_sensor_to_abstract,
 }