The Siemens DSC Dual SYNC Control Unit is an optional accessory for a fire alarm system control unit. This unit provides synchronization of the MC and HMC strobes and synchronization and silenceability to the MTH series of electronic audible signals. When connected to a compatible polarity reversal type of notification appliance circuit; there is supervision of the wiring from the control unit through the DSC unit to the End-of-Line device.

The Siemens DSC unit triggers the strobe lights to flash at a rate of 1 to 1.1 flashes per second. The DSC unit also triggers the MTH series of electronic audible signals to sound in a synchronized temporal or march time pattern; the audible signals may also be silenced while the strobes continues to flash. Additionally, the unit can support two Style Y (class B) or one Style Z (class A) notification appliance circuit(s).

The DSC unit alternatively configured to synchronize conventional audible notification appliances. The DSC configured to sound audible devices at a temporal or march time pattern. Or, the silenceable input used to slave from an existing coded fire alarm system control unit. Also, refer to P/N 315-096363 for a list of compatible notification appliances and the maximum number of devices allowed per NAC circuit.