Grass Valley Switcher Products - Manual (Page 10)

10 Switcher Products — Protocols Manual
Section 1 — Tally Protocol
with three downstream keyers (on the 3-ME model an additional four ME
keyers are available, making a total of seven), and has two program and
two preview outputs.
Many of the Zodiak system’s 26 outputs are dedicated, and 13 aux buses
are available. Zodiak system output pairing is different from that on
Kalypso systems.
The Zodiak Still Store has two inputs and four outputs.
Kayenne System Overview
A Kayenne system provides 24 tallies relays per installed ME board.
Smaller 4-RU Kayenne frames support up to 48 relay tallies. Larger 8-RU
Kayenne frames support up to 96 relay tallies.
Kayenne systems have a modular design available in different configura-
tions, ranging in size from 1.5ME to 4.5MEs. From a protocol perspective, a
Kayenne can have up to 5MEs (which includes the ME50). Kayenne
systems have 6 keyers per ME.
Kayenne systems also support an Image Store capable of 6 input and
output channels, and a floating eDPM effects system.
Kayenne Source IDs are in the range of 1-146 (Kalypso was limited to 128).
The message sync algorithm employed is different from Kalypso because
source IDs can have values greater than 128. The size of the contribution
tally is 303 bytes (Kalypso was 223 bytes).
Tally Background Information
This subsection describes what a switcher does in terms of tally calcula-
tions, and may be useful for persons designing a tally computer that uses
serial tally information.
The tally system of a production switcher provides status to devices and
their operators. The most basic status is whether or not the device is on air,
but other statuses can also be provided by the tally system. For example,
the Kalypso system has four program outputs on its PGM PST bank. The
tally system is not affected when one of the additional outputs is simply a
“clean feed” version of the main program output. However, customized
feeds which depart from the program output are possible. These custom-
ized outputs may include sources which are not present on the main
program output. For example, the switcher may automatically substitute a
“private” camera for a wide shot. The tally system provides ways to prop-
erly tally these special situations.