This is the second meaning of "entry" from my MacBookPro's (English) dictionary:
2 an item written or printed in a diary, list, ledger, or reference book.
• the action of recording such an item : sophisticated features to help ensure accurate data entry.
In the sense that LX uses "key entry" it simply means an item in the key.
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Below is a diagram of how the key works. Every light that is drawn has properties, channel, color, etc. One of these properties is a reference to an entry in the key.
The key entry, in turn, has a list properties that are common to all lights that reference it. One of these properties is a reference to a symbol that tells how to draw a graphic representation of the light.
To draw itself, the light looks up its key entry and from there finds the symbol which provides the instructions for what it looks like.
Changing either the light's reference to the key entry or changing the key entry's reference to the symbol will alter the appearance of the light. (with the exception of the rare case where the new key entry also points to the same symbol!)
For the most part, if you change a light's keyID to reference a different key entry, the light's info properties such as its channel will remain the same. But, the key entry also determines what info properties a light contains. This changes depending on the kind of key entry. Most kinds of lights have a channel. But, a barndoor does not. A PC or Fresnel will have a spot/flood setting while a fixed focus ERS does not.
Some key entries have a custom symbol. When this is the case, the symbol is stored as one of the key entry's properties. This makes the symbol ID irrelevant because it is not needed to find the instructions for drawing the symbol.
Some kinds of key entries have a table of device addresses. This table is used to expand a base dimmer/address into a list of addresses corresponding to different controllable parameters. A light uses its reference to the key entry to find this table. The light then takes its base dimmer and adds the DMX offset for each address in the table to derive its patch list.
The device addresses table is also used to connect channels that control each output DMX address. This can be done in several ways. Every light that has a device addresses table also has a "Channels" info property. This property can contain a list of channels that control each of the parameters in the table. This simple method would apply if you were using a console that did not support parameters and you had to assign a discrete channel number to each function.
Most modern consoles consolidate different functional parameters into a single channel number. But, there's not really a standard way of doing this. LXSeries uses a schema of sub-channels to refer to various functions. Because of the wide variety of functions available, the sub-channels schema defines some standard functions and leaves numbers open for others.
In LXSeries, a channel that has multiple functions is referred to by a number, a decimal point, and a sub-channel number. Sub-channels 0 to 50 are reserved to be defined by LXSeries. Sub-channels 51 to 99 are undefined and can be used for functions unique to a particular device.
Sub-channel 0 (or the absence of a sub-channel) is always intensity. Sub-channel 1 always refers to the frame of a color changer. Sub-channel 53 might refer to a strobe or macro function. The definition of sub-channel 53 is left open to mean whatever the user wishes.
In the same way that a light uses its reference to a key entry to use a table of device addresses to expand its dimmer into multiple dmx numbers, a light can also use the table to expand its channel into a list of channel.sub-channels.
When setting up the device addresses table, functions can be chosen from a combo box menu. This automatically assigns the correct sub-channel number. If you use the menu to select "Pan", the sub-channel will be set to "2". If you type the name of a function that is not recognized, the sub-channel will be assigned the next available number above 50. For the most part you should accept these assignments and not enter sub-channel numbers manually.
Sub-channels defined by LXSeries often have special connections. Color mixing sub-channels for example are used to determine the color of a light's beam when it is displayed. A color mixing fixture has a "mix type" property that tells LXBeams what sub-channels to expect to use to determine the beam color. A mix type of "rgb" for example, expects to find entries for sub-channels 23, 24 and 25.
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To work as expected your ADJ Mega Tri Bar LED entry should have a color mix type of "rgb". It should also correct the sub-channel numbers.
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