The GPI and Tally Interface by Blackmagic Design, is an Ethernet device which provides eight
mechanical relay contact closures to ground that can be used for tally. Tally signals are sent
from the Ethernet port of your ATEM switcher to a GPI and Tally Interface on the same network
as the switcher. By following the wiring guide on the back of the GPI and Tally Interface, a
breakout cable can be connected to video equipment that supports contact closure tally
signals, such as Blackmagic SmartView Duo and SmartView HD. Up to 8 tally receiving devices
can be supported with a single GPI and Tally Interface. Only one GPI and Tally Interface unit is
needed when used with an ATEM 1 M/E Production Switcher, ATEM Production Studio 4K
models or an ATEM Television Studio. Two units of GPI and Tally Interface are needed when
used with the 16 inputs of ATEM 2 M/E Production Switcher and 3 units will be needed for the
20 inputs of the ATEM 2 M/E Broadcast Studio 4K and 2 M/E Production Studio 4K.
The GPI inputs are optical isolators which are triggered by connection to ground with a
maximum of 5V at 14mA.
The tally outputs are mechanical relay contact closures to ground with a maximum of 30V at 1A.
The following table illustrates which tally signal is sent when a switcher input is selected on the
program output. When using GPI and Tally Interface with an ATEM 2 M/E Production Switcher,
use Blackmagic ATEM Setup to set one unit to signal on tally outputs 1 - 8 and the second unit
to signal on tally outputs 9 - 16.
Program Output Tally signal Program Output Tally signal
Switcher Input 1 Tally 1 Switcher Input 9 Tally 9
Switcher Input 2 Tally 2 Switcher Input 10 Tally 10
Switcher Input 3 Tally 3 Switcher Input 11 Tally 11
Switcher Input 4 Tally 4 Switcher Input 12 Tally 12
Switcher Input 5 Tally 5 Switcher Input 13 Tally 13
Switcher Input 6 Tally 6 Switcher Input 14 Tally 14
Switcher Input 7 Tally 7 Switcher Input 15 Tally 15
Switcher Input 8 Tally 8 Switcher Input 16 Tally 16
Changing the Network and Tally Settings
Blackmagic ATEM Setup is used to configure the network settings in the GPI and Tally Interface
so it will communicate with your ATEM switcher. The GPI and Tally Interface must be connected
via USB in order to configure its settings with the Blackmagic ATEM Setup.
1 Connect the GPI and Tally Interface to the same Ethernet network as your
ATEM switcher.
2 Connect the GPI and Tally Interface to a USB port on your computer and also connect
the included power supply.
3 Launch the Blackmagic ATEM Setup.
4 If your ATEM switcher connects directly to your computer or ATEM broadcast panel
without an Ethernet network switch, choose to “Configure Address Using Static IP”.
The GPI and Tally Interface defaults to a fixed IP address of 192.168.10.2 when shipped
and we suggest you use this number for simplicity. If you are using two GPI and Tally
Interface units with an ATEM 2 M/E Production Switcher, we suggest setting the second
unit to 192.168.10.3.
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