https://vedardalarm.com/addressable-single-io-module-lpcb-intelligent-module-p-251

TC series professional fire alarm I/O module designed to connect with linkage devices of fire alarm control panel, such as exhaust valve, air valve, fire damper etc., and
can receive feedback signal from device
4 Non-polarized two-wire
4 Active and passive output
The input terminal can be in field set to normally open
detecting wire or self-feedback mode, which can be
connected with passive contact
Approvals：LPCB（EN54-18） CE