Network Graphic Annunciator (NGA) Operations Guide P/N 9020-0675:B1 03/21/13 13
User-Defined "CAM Text" Messages The LCD Touch Screen
2.4 User-Defined "CAM Text" Messages
The NGA supports up to 512 User-Defined CAM Text Messages that may be triggered according to
user programming.When one of these text messages are active, the "FIRE or MNS MSG" tab
appears active on the "System Status" screen.
If a Trouble, Supervisory Off-normal, CO/Gas, Fire Alarm or MNS Alarm condition occurs while
the User-Defined Text Message displays on the screen, the NGA display automatically changes to
display which is the highest-priority event on the system.
Likewise, if a User-Defined Text Message is triggered while a Trouble, Supervisory Off-normal or
Alarm condition is present, a number appears inside the "TEXT MSG" tab. This number indicates
the number of User-Defined Text Messages that are active.
Unlike Trouble, Supervisory Off-normal or Alarm conditions, activation of User-Defined Text
Messages does not do the following:
• normally sound the NGA's buzzer
• illuminate any of the NGA's front-panel LED indicators
However, the text message may be optionally configured to cause the NGA to issue a System Event
when displayed. In this case, the System Trouble LED and Buzzer will activate and the system will
initiate any other actions that are configured to occur due to that Event.
Figure 2.4.1 illustrates the screen that appears when the TEXT MSG tab is active from the System
Status screen.
Figure 2.4.1 System Event Screen Showing Active
User-Defined “CAM Text” Message
NOTE: The term, CAM, is the acronym for Conditional Action Map. CAM refers to the Boolean
logic equation that, when true, causes an output resource or device to respond to a given set of
input conditions that the equation defines.
If the logic expression is true, the device resource activates. If the logic expression is false, the
device or resource deactivates.
NOTE: User-Defined “CAM Text” messages may be optionally configured to cause the NGA to
issue a System Event when the System Trouble is displayed. If the system is configured to display
user-defined “CAM Text” messages, the “FIRE or MNS MSG” tab is activated and displays the
associated trouble condition.
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