Embed Red/Green Tally Information on SDI signals from GPI Inputs

The SKAARHOJ SDI-GPI Link box will accept 16 digital inputs from your video infrastructure and convert them into Blackmagic Camera Control Tally signals. This will for instance enable any video switcher with tally contact closure outputs to send essential tally information to your supported Blackmagic cameras such as URSA Mini (+Pro) or Studio Camera series.



DB25 Connector Configuration
Example of possibilities in the web interface

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 (see picture).


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, ATEM CCU console 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: 720p50, 720p59.94, 720p60, 1080i50, 1080i59.94, 1080i60, 1080p23.98, 1080p24, 1080p25, 1080p29.97, 1080p30, 1080p50, 1080p59.94 and 1080p60, 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.

2x8 GPIO (optional)

As an option you can get a 2x8 GPIO module, to extend GPI to a total of 16+8=24 inputs. Furthermore you get 8 GPO.

Supported Hardware Devices

Check out the UniSketch page to see which types of hardware devices supported in the SDI-GPI Link.

Principle sketch for setup with the SDI-GPI Link



SDI-GPI Link Features

  • 1 x DB25 Connector
  • 16 Digital inputs
  • Blackmagic 3G-SDI Arduino Shield
  • Option: 2x8 GPIO (extra 8 inputs and 8 outputs)
  • UniSketch web interface for configuration

Physical Specifications

  • Enclosure Size 12.7 x 8 x 4.9 cm
  • Weight 0.315 kg
2x8 GPIO option. The controller will not have this module, if this option is not selected.

2x8 GPIO Module

Get the 2x8 GPIO module to add an additional 8 inputs and to get 8 outputs. The SDI-Tally will not have this module, if this option is not selected.

You either place your order by PayPal or by email and pay by bank transfer - please read the "Pricing, Terms and Conditions" page for more details. 

€ 599 / $ 849

- for customers worldwide (except USA)  

Models and Options

$ 699 / $ 1049

- for customers in USA

Models and Options



Shipping Configurations:

Note for SKAARHOJ controllers with Blackmagic 3G-SDI Arduino Shields and Studio Fiber Converter/Camera Fiber Converter:

We have tested Blackmagics fiber converter products in general to work with SDI output. This includes the Mini Converter, ATEM Camera Converter, ATEM Studio Converter and ATEM Talkback Converter 4K. The only product we know does not work is the Studio Fiber Converter/Camera Fiber Converter. This product is not compatible with their own 3G-SDI shield which is the component we use inside the RCPs and other products. While the Studio Fiber Converter/Camera Fiber Converter will forward shading data from an ATEM switcher it will not do so for the 3G-SDI shield.

Bottom line is this: We cannot change this situation, only Blackmagic Design can decide to upgrade either the Studio Fiber Converter/Camera Fiber Converter or the 3G-SDI Arduino Shield to make it work. At this point we can suggest that you rather connects a controller to an ATEM switcher which will work as the master for sending out the shading data. You might employ a cheap ATEM switcher for only this purpose.