Connecting Tally using the
Blackmagic3G-SDI Shield for Arduino
If you are using an SDI switcher with a tally output connector, you can connect the tally outputs
to a Blackmagic 3G-SDI shield for Arduino 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 the Blackmagic shield
and 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 8 separate
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
Blackmagic 3G-SDI 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 3G-SDI
Shield for Arduino.
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 in this section shows how the Blackmagic 3G-SDI Shield for Arduino
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 Shield for Arduino. Instruction manual from the Blackmagic Design support
center at www.blackmagicdesign.com/support.
133Connecting Tally using the Blackmagic3G-SDI Shield for Arduino
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