UNIVERSAL CONTACTS
These button control GPIO contacts that can be used to switch an on-air matrix and the signal for
traffic announcement but due to the universal character of the system these can be used for any
other purpose a switch is needed and / or a signal has to be displayed.
The main screen has 2 extra buttons coupled to a GPO and a GPI. These can be used for signaling
and as standard switches or operated in a ‘handshake’ mode.
Pressing one of the buttons “On-Air” or “TA” the assigned GPO will switch and
the background color changes into green as a sign that the GPO is on.:
Pressing the button again from this state the GPO switches off and the color
turns into default (blue) again.
At an acknowledgement on the assigned GPI the color changes into red:
To prevent unintentional switching you can now only switch this off by touching
and holding the button (> 2 sec).
In case the external GPI is activated from the default state the color of the
background changes into yellow:
By subsequently pushing the button it will turn red and the GPO closes.
As an example by wiring this GPO in series with a fader contact of a microphone this can be used to
control a traffic announcement system.
Eela Audio D4 manual
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