Smoke Alarm User Manual

Installation, Operation and Maintenance Manual
Issue 1 Page 2-9
February 2001
2.3.2 Termination Board
The termination board is micro processor controlled providing the interface between the detector head,
the RS-485 network, the Display module and the PC Port. A seven position DIP switch on the termination
board allows the network address to be set, enabling 127 Detectors to be connected. An on board
memory stores configuration details, history events and system information. In the event of a power
failure, information can be retained for up to a period of approximately 90 days by a battery back-up. An
on board LED, when lit, provides indication of power.
An adjustable switching regulator, located on the termination board, ensuring optimal supply voltage to
the fan.
The termination board provides 6 relays with volt free change-over contact rated at 2 amp, 30 V DC. Each
relay has its own operation as detailed below:
Pre-alarm level 1
Pre-alarm level 2
Alarm level 1
Alarm level 2
Trouble
Isolated
It should be noted that the Trouble relay is energised in its normal condition so it will transfer when power
is lost.
The termination board can communicate to an external PC, running LaserNET software, via an RS-232
output. Connection will be by a standard RJ12 connector. Communications will allow for the up/down
load of configuration and history data. Both configuration and history data are stored within an on board
non-volatile memory. The system will retain the configuration and history data following a CPU reset or
extended periods of power down only when the termination board battery link LK3 is installed.
The termination board provides connections for a supervised power supply unit, Intelligent Interface
Module (IIM) and a remotely mounted Display Module (optional). Ease of installation and maintenance is
achieved by using the removable terminals.