Viz Vectar provides Tally Light support to allow you to connect external tally lights and similar devices. These typically provide a red LED for a video input selected on the Switcher’s Program row. (NDI outputs also natively support tally over the network to supporting devices and applications without a separate connection.)

Here is a pin-out listing for the HD15 Tally connector:

Pin	Output
Pin1	LED1
Pin2	LED2
Pin3	LED3
Pin4	LED4
Pin5	Reserved
Pin6	Reserved
Pin7	GPI3
Pin8	GPI4
Pin9	GND
Pin10	GND
Pin11	GPI1
Pin12	GPI2
Pin13	NC
Pin14	3.3V (20 Ohms limit)
Pin15	NC

Engineering Notes

Pins 1-(4 or 8) are hot when the LED should be illuminated.
Each LED pin 1 (4 or 8) has a 200 ohm current limiting resistor.
With no load (open circuit) the LED pins can reach 5V. With a typical LED load, they can be expected to reach about 3V.
GPI stands for General Purpose Interface. Pins 11 and 12 are assigned for possible future use as GPI1 and GPI2 connections, but software support for GPI triggers has not been implemented at this time.
To prevent damage to internal components when making connections to the tally light jacks, care should be taken that connection to Pins designated GND (Ground) are always at ground potential.

Viz Vectar User Guide

Tally Lights

Engineering Notes

Search results