DIGITIZE System 3505 Prism LX - Introduction; Purpose; Scope; Serial Communications

700300-0001 Rev. B 10/21 1-1
1 Introduction
1.1 Purpose
The purpose of this manual is to inform the user how the OnyxWorks to Digitize PrismLX
operates.
The goal of the PrismLX Custom 0080 interface is to monitor the Unsupervised Printer
output from the OnyxWorks CAD system and pick out the Fire Alarms and Fire Restore
signals.
When a Fire Alarm output from the OnyxWorks is detected, the PrismLX will annunciate
the event and set up to code the appropriate Telegraphic code to the Boston Fire
Dispatch (BFD) via an existing 100Ma Telegraph loop that is routed near the PrismLX at
Northeastern University. The PrismLX will wait 60 seconds prior to automatically coding
out the Telegraphic code to BFD. The operator has the ability to prevent the activation
of the BFD code or initiate it prior to the 60 second finishing its countdown. Should the
OnyxWorks process a restore prior to the end of the 60 second countdown, the PrismLX
will abort the pending transmission. However, should the restore be processed after the
Telegraph code is initiated, only the Dispatcher can abort the coded output.
Note that the accounts and location names used in the examples are for illustration only
and do not match the user’s data.
1.2 Scope
While in most applications using the PrismLX, the PrismLX is used as the Proprietary
Alarm Monitoring System used by the dispatcher to monitor and respond to Alarm,
Trouble and Supervisory events. However, in the case of Northeastern, the function of
the PrismLX is to sort out and notify the BFD, unless canceled, of a fire event. The
PrismLX will stack up multiple Fire and or restore events and will only process the
backed-up events after the current event is either canceled or we reached the end of the
coded output. Thus, for this reason, the PrismLX, with its custom program #0080, would
not comply with the requirement to process an event within the specified NFPA time
requirement
1.3 Serial Communications
For Custom 0080 to work properly, the PrismLX must have OPTION 2 SET for CAPS II
and of course the option should be set for 0080. On power up, the PrismLX will set the
BAUD rate to 9600 8N1 to allow interfacing to the OnyxWorks.