Barnett Engineering ARU CV2 Operations Overview, 1.1 Cv2 Capabilities, What constitutes an alarm?

Operations Overview 1-1

1. Operations Overview

The purpose of this chapter is to provide an overview of the Cv2 capabilities. Chapter topics are organized in the same order that you would follow in setting up the system. Read this chapter carefully before proceeding with the installation and programming of the Cv2. For more details on configuring the operation through the programming software, refer to Chapter 3, Configuration.

1.1 Cv2 Capabilities

When an alarm occurs, the Cv2 places a call using its built-in cellular phone and announces the alarm condition using stored voice messages. Alarm messages consist of the site ID phrase, the group phrase and the alarm message phrase that are stored at voice programming time. The group phrase is used if the alarms have been grouped to provide different activities for different alarm conditions. The unit can also be called up and interrogated to obtain current alarm conditions and readings.

The Cv2 has eight hardware inputs that can be programmed to accept either digital or analog signals and eight hardware outputs. Inputs can be independently configured to operate in these modes:

digital	monitoring contact closures or voltage levels
watchdog	monitoring for the absence of a periodic event
totalizer	counting events
interval	measuring the time duration of events
analog	measuring 0 to 5 volt signals

Outputs can be set to operate as either on/off controls or as timed controls.

1.2 What constitutes an alarm?

Alarm conditions can be defined for digital, watchdog and analog inputs. Totalizers and interval inputs are used for measurement purposes and do not generate alarms. The signal at the input is conditioned by a debounce timer that ensures the level is valid before accepting it.

A digital input has normal and alarm states that can be defined as either when the input is high or low. After the input signal has been qualified by the debounce timer, it can be registered as an alarm when the input is active, or it can be latched to detect a pulsed condition. The voice message for a digital input is programmed to announce the alarm condition that it is monitoring, e.g. “Intrusion Alarm”.

Watchdog inputs use a timer that is restarted by changes at the input. If this timer expires because it has not been restarted within the programmed interval, an alarm will register. Like the digital input, the watchdog can be set as either an active-only or latched alarm. The voice message for a watchdog is similar to a digital, e.g. “Tower Strobe Failure”.

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