Wireless 4-way transmitter module. With replaceable antenna. If required, a FA250 radio antenna can be connected. Stand-by loss only 0.1 watt. Series installation device for mounting on mounting rail (1TE). Connection to the Eltako RS485 bus. Cross-wiring of the power supply with jumper. Alternatively, power can be supplied with a switched-mode power supply 12V DC at the +12V/GND terminals. This radio transmission module has four channels and can thus send radio telegrams to the Eltako building radio like a 4-channel radio button. E1 triggers a radio telegram like pressing the rocker on top of a radio button with a rocker, pressing E2 as the rocker on the bottom, pressing E3 as the left rocker on the top' of a radio button with a double rocker and pressing E4 as the left rocker on the bottom of a radio button with a double rocker. The message frame when the control contacts are opened is identical to releasing the wireless button. Several radio transmission modules must not be controll