EXTA FREE system radio transmitters, enabling the control signal to be sent from the main switchgear of the building or other location where building automation devices are installed on the TH 35 rail. The devices naturally extend the possibilities of traditional, wired EXTA building automation devices, they can also cooperate with any , another relay automation system. In addition, the RS485/EXTA FREE RXM-01 translator allows you to connect intelligent building systems or programmable controllers/relays with the EXTA FREE system via the standard RS485 protocol.