Internal vs. external time – ETC Eos Family Show Control User Manual
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Show Control Display
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• List - is the event list number.
•
• Label - names the event list.
• Type - sets which type of show control protocol to use; MTC, SMPTE, Analog or RTC. Only
one protocol can be used at a time per list.
• Source - should match the Group ID used in the connected Net3 Show Control, I/O Gateway,
or the local ports on Gio, Ion, or Element.
• Internal - enables the list to use internal timing sources.
See “Internal vs. External Time”.
• External - enables the list to use external timing sources.
• First Time - sets the first time that the console will use when using internal timing.
• Last Time - sets the last time that the console will use when using internal timing.
• FPS - sets how many frames per second (FPS) will be used; 30, 25, 24.
• Status - current status of the event list.
Internal vs. External Time
The Eos Family show control system makes use of two timing sources, internal and external. The
different protocols use internal and external clocks in different ways.
Time code (MIDI or SMPTE) normally requires timing information from an input source, like a show
control gateway. This timing source is referred to as external time, since it is coming from a source
external to your console.
If the external time source is not available for any reason, each time code event list within your
console has an internal timing source which will assume control, if enabled. This internal timing
source requires three pieces of information to determine how to generate its timing: first time, last
time, and frame rate. When the internal clock reaches the last time, it will reset to the first time and
continue running.