Available Product id: SDI-GPI-Link-V1
Shipping Worldwide : Will be shipped as soon as possible

From the factory the box is configured to control camera IDs 1-8. When input 1-8 is closed to GND, the red tally flag for camera 1-8 respectively will be set on the SDI output from the box. Likewise input 9-16 (on the same DB25 connector) will result in green tally (preview) being set on the SDI output.
If you want tally control of camera IDs other than 1-8 or if you want just red tally for camera 1-16 for instance, you simply configure the inputs in the web interface.
The SDI input should be connected to your source for the camera return feed. This would typically be a program output and possibly enriched with CCU data via either an ATEM switcher, the SKAARHOJ RCP, or the Blackmagic Arduino Shield. The SDI Tally box passes through all CCU information and only overrides Tally information.

Camera Support
The Blackmagic 3G-SDI Arduino Shield supports the following formats using SDI Level B: 720p50, 720p59.94, 720p60, 1080i50, 1080i59.94, 1080i60, 1080p23.98, 1080p24, 1080p25, 1080p29.97, 1080p30, 1080p50 (output only), 1080p59.94 (output only) and 1080p60 (output only), but the camera doesn´t have to be running the same video format as the program input, so you can use cameras in Ultra HD while the camera protocol is sent over HD signal to the camera.

Please Note: SKAARHOJ Controllers with GPI inputs accept open collector relay outputs (pulled to GND). The default HD15 tally connector on the TriCaster TC1 does not provide a direct working signal to the SDI-GPI Link. Converting the 5V potential to GND is needed.

Shipping Worldwide : Will be shipped as soon as possible
1 x DB25 Connector
16 Digital inputs
Arduino Shield

Blackmagic 3G-SDI Arduino Shield

Sketch for setup with the SDI-GPI Link

Have a look at the Connection Diagram principle sketch for setup with the SDI-GPI Link here.


BMD Cam Control

Sets red tally on Cam 1-8 on GPI IN 1-8.

Sets green tally on Cam 1-8 on GPI IN 9-16.

See the "Blackmagic Design: Camera Control Actions" manual for Device Core options such as "Momentary Override".

BMD ATEM Tally follow NewTEk Tricaster Tally

Configuration for setting PRV/PGM on ATEM based on PRV/PGM state on TriCaster TC1.

Utilizes Virtual Hardware Components.

PRV/PGM 1-8 are set - can be extended.

SDI-GPI Link  
Length: 82 mm Width: 146 mm
Height: 48 mm Total weights: 0.314 kg.


You can find our technical drawings on this site:

Shipping data (Box)
SDI-GPI Link  
Length: 230 mm Width: 170 mm
Height: 50 mm Total weights: 0.608 kg.
Power Consumption



EAN Code - Tariff Code & CoO


EAN Code: 5714074001546

US Tariff Code: 8471.80.10

Rest of the World Tariff Code: 8471.80.00

CoO: Denmark


Inserting Tally signals on SDI with SDI-GPI Link

Demonstrating the SDI-GPI Link as a means to insert tally data on the SDI return signal to Blackmagic Design cameras. After a basic demonstration of this feature we will move on to discuss advanced modes like Momentary Override and how it should probably be enabled on a product like the SDI-GPI Link in case you wish to pass camera control data through the SDI-GPI Link box

License Creative Commons Attribution license (reuse allowed)

Embedding Tally on SDI and picking Monitoring Solution for CCU operator of Blackmagic Cameras

The video takes you though some insights about embedding Tally on SDI return to Blackmagic Design cameras and discusses three ideas to how a preview monitor solution for use with SKAARHOJ CCU or RCP panels could look.

License Creative Commons Attribution license (reuse allowed)

Converting Tally signals from SDI to contact closures with SDI-GPI Link

If you need to extract ancillary data tally signals from an SDI signal and have relays flip instead, this video will show you how to use the “SDI-GPI Link” in reverse to achieve this ends - thanks for UniSketch it’s easy to add this feature to your existing hardware!

License Creative Commons Attribution license (reuse allowed)

12 V Power Supply

Manufacturer: PHIHONG

Model Name: PSA15R-120P

Output: 12V/1.25A

Cable Length: 1.5m

Adapter type: EU, GB, US, AU depending on shipping conutry

DC Output Connector: 5.5mm x 2.1mm x 10mm Center Positive

USB Programming Cable

Type: USB 2.0 A-Micro B

Length: 1m

Recommended cables (not in the box)

As of September 1st 2022, we will no longer send Networking Cables when we ship our controllers, due to the environment. Instead, we will recommend using LAN Cat 6 S/FTP or better.