Assigning Gpio To A Source - Axia Element Installation & User Manual

Assigning GPIO to a Source

As you've seen by studying the previous pages, a lot
of the work of assigning logic to a source is done for you;
once a GPIO port is linked with a Source Profile, all that
remains to do is to solder cables connecting the GPIO's
DB-15 connectors to the device's control interface.
So, how do you link a GPIO port with a Source Pro-
file? It's very easy; let's do it step-by-step.
Note: This procedure assumes that you have
already defined at least one Source Profile using
the instructions outlined in Chapter Two.
1. Open your Web browser and enter the IP address of
your Element console. Choose
from the Element Control Center menu. Enter your
password if prompted (default login is "user", leave
the password field blank).
2. If you haven't previously assigned any GPIO ports,
the GPIO definitions screen will be blank. Notice the
status indicators at the top of the page, showing the
state of the input and output pins of each port. Click
on the list icon to the right of an unused line.
3. When you click on any list icon, a small popup win-
dow will open, enumerating all of the audio sourc-
es available on the Livewire network (Figure 3-3).
Choose the source you wish to associate with a GPIO
port by clicking on it; the window will close and the
source's name and channel number will appear in
Figure 3-2: GPIO definitions page
GPIO Configuration
©2008 Axia Audio — Rev. 3.0
Figure 3-3: GPIO Select Source popup list
the box.
Channel
4. Type a descriptive name in the
on the button at the bottom of the page.
Save
5. Look at the page-top status indicator for Port 1.
You'll see that one of the pin status indicators is
lit in green; this means that the port is now send-
ing a GPIO logic state of "true" through this
pin. Assign the source for which you just created
a GPIO link to a Element channel; operate the
and keys for the channel and watch the
On Off
pin status indicators change as you do so.
The source we've been using for this demonstra-
tion is a telephone hybrid; we can now observe the
pin status indicators change as we turn the channel
on and off, as shown in Figure 3-4.
Figure 3-4: Pin status indicators showing
GPIO port activity
Referring to the Hybrid Logic Chart on Page 28, we
can see that when the Element channel is
indicator representing Output Pin 2 – the
logic command – is high. Turning the channel
we see Pin 4 pulse briefly before Pin 1 goes high:
the GPIO has just sent a
Lamp. If you turn the channel
On
observe a pulse, and the
Stop
field, and click
Name
, the
Off
Off Lamp
,
On
pulse, then lit the
Start
again, you'll
Off
command
Off Lamp