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Nyquist C4000 User Guide
Message Priorities and Precedence
Multiple messages can be displayed on an NQ-GA10PV at the same time. It is even possible to queue up
more messages than can be displayed at one time. Because of this, we need to determine a message’s
precedence. Messages with a higher precedence are displayed before messages with lower precedence,
and can even override and interrupt a lower precedence message.
Note: The term “priority”, as used here, refers to a numeric value assigned to a message. The term “pre-
cedence” refers to the determination of which message will be displayed over another message after
evaluation of the assigned message priorities and other related factors, as described below.
There are several factors that affect the precedence and display of a message.
The first factor is the message Priority. This is a number from zero (0) through six (6), where zero is the
lowest priority and six the highest.
The second factor is the Image Priority, which applies only to Image type messages, and is applied
when two messages have the same message priority. This is either Text Over Image or Image Over
Text. The first implies that text messages have precedence over this image message, while the second
implies this image message has precedence over text messages.
The third factor does not actually affect the precedence, but is relevant in that it determines where an
image is displayed, which can affect whether or not other messages can be seen. The Image Type of a
message can be either Right, Left, or Full Screen. Right and Left specify on which half of the screen the
image will be displayed, while Full Screen specifies that the image will cover the entire screen. Since text
messages display on the right side of the screen, an image displayed on the left side can show both
messages simultaneously, while an image displayed on the right side or full screen will be subject to the
precedence rules.
Message Precedence Rules
The following set of rules determine which messages have precedence and how they are to be dis-
played:
• Text messages are sorted in descending order by priority, and then in the order they were sent.
• If two messages of the same type (Image or Text) have the same priority, the newer one has prece-
dence.
• If an image message and a text message have the same priority, the Image message’s Image Prior-
ity property determines which has precedence:
• Text Over Image: Text message has precedence.
• Image Over Text: Image message has precedence.
• Full Screen image messages take precedence over everything except another Full Screen image mes-
sage, for which normal rules of precedence are applied.
• Priority 5 (Exclusive) messages always display alone, which prevents all lower precedence messages
from being displayed.
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