Pacific Research Solutions PET-820 - Manual (Page 56)

Pacific Research PET-820 User Manual
Page 55
GLOSSARY AND WARRANTY REPAIR
8.0 GLOSSARY
ADC: Analog to Digital Converter, this is a device or circuit that converts an analog voltage to a digital number.
ANALOG: A voltage that has multiple or dynamic levels with in a given range.
CLEAR: Aborts a function before it is completed, to allow the user to start over again.
DEFAULTS: Pre-set values that define the system characteristics. A default is the value that the unit is set to when
supplied from the factory.
DIFFERENTIAL ENDED: A signal where neither side of the connection may be at zero volts. The equipment typically
will measure the voltage between the two connections and not ground.
DIAL PULSE: Used by older telephone system for dialing. This is a method where the hook switch is pulsed on and off.
These pulses are then counted by the telephone to determine the telephone number being dialed.
DISABLED: Turned off or not active.
DTMF: Dual Tone Multi Frequency. Used by telephone systems for dialing, also referred to as Touch-Tone.
EEPROM: A special type of non-volatile memory that retains its programming information without power.
ENABLED: Turned on or active.
ENTER: Identifies the end of a string of digits for entry of information.
INITIALIZE: To set up the minimum data requirement for the system.
INTEGRATE: A method of filtering an analog voltage where a quick change on the input of the integrator results in a
slower change on its output.
KEY CODE: A programmable code that is used with a command code to provide security of the command codes.
LOOP CIRCUIT: A circuit that may have normally open or normally closed, or a combination of both types of contacts
that identify a failure or change in the operating status of the equipment or process in which you wish to monitor.
LOOP RESPONSE TIME: The amount of time that a loop circuit has to remain violated in order to cause an alarm.
NEXT DATA: Information that is used to program or change the operating characteristics of the system.
OFF HOOK: When a telephone receiver is picked up or removed from the hook switch, this is termed as off hook.
ON HOOK: When a telephone receiver is hung up or returned to the hook switch, this is termed as on hook.
OPERATE COMMAND CODE: An instruction that tells the system to perform a function.
PASSWORD: A system access code that is used to secure access to all functions of the PET 820.