Radio 2-way transmitter module. With internal antenna. No standby loss. For flush mounting. 45mm long, 45mm wide, 18mm deep. The FSM61-UC radio transmitter module has two channels and can therefore send radio telegrams to the Eltako building radio like a radio button. A1 triggers a radio telegram like pressing the rocker up on a radio button with a rocker and A3 like pressing the rocker down. The telegram when the two control contacts are opened is identical to that of 'releasing the radio button'. Multiple radio transmitter modules must not be controlled at the same time. The universal control voltage at +An/-A2 processes control commands from 8 to 253V AC or 10 to 230V DC with a length of at least 0.2 seconds. Maximum parallel capacitance of the control lines at 230V 5nF. This corresponds to a length of approx. 20 meters. If terminals A1 and A3 are connected with a bridge, a radio telegram is sent from A3 once a minute as long as the control voltage is present. E.g. for central commands with priority. No constant power supply required, therefore no standby loss. The rotary switch is required to activate or deactivate the encryption and is set to AUTO during operation. Activate encryption: Turn the rotary switch to the right stop (key position) and press once. Deactivate encryption: Turn the rotary switch to the left stop (crossed-out key position) and press once.