How To | Example GPIO Configuration for Fire Alarm Relay with Digital TTL
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Many installations include safety requirements for a system-wide mute when a fire alarm is triggered. In the case of Q-SYS installations, this is typically accomplished using GPIO available on our Cores and/or I/O endpoints.
The steps below describe common settings for a system using Digital TTL relays.
- Add GPIO-input into your design for your connected device.
- Assign the GPIO input property to digital input (this will trigger the relay).
- Wire the GPIO digital input to the system mute control pin.
The first example shows a system with a low output when the alarm is off.
Depending on the triggering system, the output may be high when the alarm is in an off state. In this situation, a “logic not” will be needed as shown below.