With 4 independent amplifier channels (100 V), the 4XD125B is compatible with the Variodyn D1 system and controlled by its DOM4-8 or DOM4-24. The NF inputs and control inputs are connected to the DOM
The FRM-1 Relay Control Module is intended for use in intelligent, two-wire systems where the individual address of each module is selected using the built-in rotary switches.