Connecting products via the logic function

Once you have established an audio connection (see Connecting products to an audio input), you can also connect certain products in the SpeechLine Wired series to the digital signal processor (DSP) via a logic port.

The logic port forwards the switching information of the microphone button (pressed/not pressed) to the DSP. You can also use the logic output on the DSP to control the status of the luminous ring on the microphone button.

The logic output also allows several MAS 133 switch boxes to be integrated and controlled in a system.

The following chapters show
  • A) how to connect the MAS 133 switch box to a digital signal processor (DSP) or
  • B) to the microphone
  • C) an example setup with the Sennheiser TeamConnect system
A) Connecting the MAS 133 switch box to a digital signal processor (DSP) via the logic function
Depending on how you connect the MAS 133 switch box, different information is passed on to the digital signal processor (DSP).
Logic port
Forwards the switching information of the microphone button – pressed/not pressed – to the digital signal processor.
Forwards the microphone status – active/muted – to the digital signal processor.
  1. Using a 2-core cable (Ø 0.14–0.5 mm2), connect the switch box to a “GPIO port” or logic port on the digital signal processor.
  2. Lay all cables in such a way that other people cannot trip over them and injure themselves.
  3. Follow the instructions for connection in the operating instructions for your signal processor (DSP).
B) Connecting microphones to a digital signal processor (DSP) via the logic function
To establish a logic connection in addition to the audio connection:
  1. Using a 3-core cable (Ø 0.14–0.5 mm2), connect the microphone or the microphone base to a “GPIO port” or logic port on the digital signal processor (DSP).
  2. Lay all cables in such a way that other people cannot trip over them and injure themselves.
  3. Follow the instructions for connection in the operating instructions for your signal processor (DSP).
  4. Slide the switch for the microphone button behavior to the ON position to activate “DSP remote mode”.
    The microphone is always active in this setting and is muted or reactivated by the DSP.
    The microphone thus permanently provides a reference signal for AEC algorithms in the DSP.

Example setup with Sennheiser TeamConnect

Example setup with XLR-3 microphone







Example setup with XLR-5 microphone and luminous rings