Connecting Tally using the
Blackmagic3G-SDI Arduino Shield
If you are using an SDI switcher with a tally output connector, you can connect the tally outputs
to a Blackmagic 3G-SDI Arduino Shield to send tally signals to your Blackmagic Studio Cameras.
This means you can still get tally on your Blackmagic cameras via the SDI program return feed
even if you aren’t using an ATEM switcher.
For example, the switcher’s parallel tally port connects to pins D2 - D9 of your Blackmagic
shieldand the shield’s SDI output is connected to all Blackmagic cameras via a distribution
amplifier, such as a Blackmagic Mini Converter SDI Distribution. This way you can send tally to
8separate Blackmagic cameras.
The Blackmagic camera number must match the switcher’s tally outputs, which means you may
need to wire a custom connector to make sure the pins correspond to each camera number.
The common GND from the switcher’s tally connector must be connected to the GND pin of the
Arduino shield.
Below is a configuration example showing how the Blackmagic camera numbers match the tally
outputs from the switcher, which are then connected to the pins on the Blackmagic
Arduino shield.
Blackmagic Camera Number Switcher Input Number Arduino Pin
1 1 D2
2 2 D3
3 3 D4
4 4 D5
5 5 D6
6 6 D7
7 7 D8
8 8 D9
The example sketch below shows how the Blackmagic Arduino shield is programmed to send a
tally signal to the camera that has been switched to the program output. All SDI switchers that
have open collector outputs are configurable for tally using the Blackmagic 3G-SDI Arduino
Shield. For more information, download the Blackmagic 3G-SDI Arduino Shield instruction
manual from the Blackmagic Design support center at www.blackmagicdesign.com/support.
3131Connecting Tally using the Blackmagic 3G-SDI Arduino Shield
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