Just What is an Automatic Alarm Dialer?
An automatic remote dialer is a device that monitors conditions at a remote site and, if an alarm condition developes, will alert people (or data processing equipment) at other remote locations. The local conditions may be monitored by a variety of sensors to keep track of the environment, process parameters, intruders, etc. Inputs may include one or more of the following: Temperature sensors, sound pickup, AC power sensors, 4-20 madc process signals, voltage analog signals, or dry contact closures. These inputs may be sensed on an alert basis in which an alarm condition generates an action, or a non-alert basis in which the input is monitored without any alarm limits.
If an alarm condition develops, remote sites will be dialed and a voice message will be transmitted when the remote phone is picked up. Some units allow the user to record a message in their own voice! If the remote phone number is not answered, the automatic dialer will successively try additional numbers entered into the system. The number of phone lines that can be called will vary from on system to another. In most cases, the waiting time before a new number is tried can be progarammed to suit preferences.
In addition, some automatic alarm dialing systems will store data acquired by their inputs and transmit them when interrogated by phone or by computer interface. Some units will continuously transmit monitored data from their inputs. Others will automatically fax a message as well as deliver a voice message or even alert a beeper! Some provide the ability of using a programming language, such as C, to implement a truly specialized set of application conditions.
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