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Use of the DMM 4650
The DMM 4650 can be used in both, incorporated in a rack shelf system or as stand-alone unit. The
installer should automate the daily sequences by external control keys, sensors, contacts and the
corresponding unit settings. This applies for gongs, alarms, messages and their combinations, as well as
for recordings of variable announcements. This contributes to a considerable advantage in the ease of
use since manually operating the appliance is not necessary anymore.
Often used functions of the DMM 4650 are directly implemented as factory presets and can be utilized
without any additional programming effort. By editing the default values and storing them into a user preset
a customer-optimized configuration is quickly developed.
Audio function
The audio signals of the electro-acoustic sound reinforcement system are looped via INPUT and OUTPUT
to the power amplifier. The SUM control can be programmed for this stand-by position. In case of failure
a stand-by relay takes over the connection. When starting a sequence via control line, the desired audio
signal gets generated (DMM SIGNAL) and fed to the OUTPUT via the programmable DMM-control. The
controls (DMM, SUM) defined within the sequence determine, whether the two audio signals are merged
or the one gains priority over the other.
The MIC, LINE input is used for recording a message and can also be used for announcement purposes.
The headphones outputs PRE-LISTEN and PRE-OUT are for monitoring the DMM signals without actually
starting a transmission.
Control function
A maximum of 16 floating inputs are provided for integration into a sound reinforcement installation. Their
use and polarity can be freely programmed. A maximum of 16 floating relay contacts are provided to be
used as control outputs. The inputs and outputs are divided into 4 Ports (A, B, C, D,); where Port A also
contains a fault contact.
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