Processing and Control for Professional AV Installations

Knowledge Base

Emergency System Mute

Many AV installations may be in buildings that incorporate some sort of fire or emergency alarm system. Symetrix DSPs come with external control inputs that can take signal from this system and either mute all output audio, or even trigger other system presets. Setting this up in Composer-based products like Prism, Radius, and Edge is quick and easy. In fact, we have a super module that makes set-up even quicker.

  1. In Composer, open your DSP programming. The fundamental programming for an emergency system mute is shown in the video, involving a 1 button momentary, inverter, and dual preset trigger modules. However, Composer comes included with a Super Module pre-built for this task. In the Super Module Library folder, double-click Import Super-module.

  2. The Windows File Explorer will open. If not already at the correct location, navigate to your Documents folder and open the folder for the Composer version you’re working in. Then open Super Modules > examples > tools, and search for emergency.

  3. There should be a couple of options: emergency alarm and emergency system mute. Select emergency system mute and open.

  4. A new Super Module is placed in the design view. Double-clicking on this module will bring up a user interface that is an easy way to visualize setup.

  5. The button currently displaying off is the trigger button for the logic programming. The Mute and Unmute presets are noted as 999 and 1,000. These are default global presets but can be changed to any preset combination depending on the installation needs.

  6. If we right click on the module and select open design, we can see inside the Super Module and look at the logic programming involved. We can see some similar modules to those shown outside in the design view, the only difference being a two input logic module and an output node. These are not critical to the emergency system mute’s function but add extra functionality to the Super Module.

  7. Right click on the off button and set up to remote control. Then select Local Analog Input and change the analog control to Switch 1-A, or whichever switch has been wired to accept the analog input.

  8. Click OK. The majority of the set up has been completed. Logic programming doesn’t work live without being online, so push the site file and go online.

  9. Once online, test your physical emergency switch to make sure it’s working as it should. If it seems like the programming is working in reverse, you can simply swap the preset numbers in the graphic interface. Alternatively, you can open up the design and reverse the sliders in the 1 button momentary. This will reverse which preset is normally on, or normally active.