Datavideo SE-4000 8-Channel 4K Video Switcher - Manual (Page 21)

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When linking via tally connection
Connect the switcher’s tally OUT port to a commercially available tally box. The tally pinout
information can be found in Appendix 1 .
Connecting the Video and Audio Output Devices
Connect projectors, large displays and other video output devices to the video output ports
on the rear of the main unit.
Tally Box
SDI-to-HDMI
Converter