1.1 Microcontroller Module
Situated within the MCU Control Unit front panel is the Microcontroller Module. This module
communicates with all Input Modules connected to the system via an I
2
C serial bus. The
Microcontroller Module also communicates with the Distribution Board and Relay Module as well
as providing a user interface in the form of a back lit 240 x 64 dot LCD graphical display and an
eight button multifunction keypad.
Note: I
2
C is a trademark of Phillips Semiconductors.
Three LED indications are provided directly by the Microcontroller Module and these are visible
via MCU front panel:
➢ Green LED indication of power on.
➢ Red LED indication of alarm condition.
➢ Yellow LED indication of fault condition.
An Audible signal is also provided by a sounder mounted within Microcontroller module. This
provides an audible intermittent tone during alarm or fault conditions.
Note:
This sounder is not intended for use as a main indication of alarm conditions. It is strongly
advised that a more substantial sounder and/or beacon be connected to this system (e.g. Status
sounder type SS367 or SS368)
The Microcontroller Module also provides the user with many configuration and interrogation
facilities via the LCD display and keypad. These facilities include:
➢ Setting of the Real Time Clock.
• The system has a battery backed 24Hr clock as a standard feature.
➢ Sensor Configuration.
• Allows adjustment of Sensor type and range (e.g. Flammable 100%LEL).
➢ Calibration of the system.
• This allows each channel to be calibrated independently. The sensor zero point and
span can both be set via this function.
• Calibration of the retransmitted output for each channel.
➢ Common Relay Configuration.
• There are four relays situated on the ‘Relay Module’. These relays can be configured
as normally energised or de-energised, and they have several triggering options
dependent on the application.
➢ Input Module Relay Configuration.
• Each Input Module contains three relays. These relays can be configured normally
energised or de-energised as required. The levels at which the relays operate are
also engineer configurable.
➢ Changing of display modes.
• The LCD has a variety of display modes dependent on the application or maybe the
personal preference of the engineer.
➢ Interrogation of logged data.
• The data for any channel can is displayed numerically and graphically.
The microcontroller module contains all of the software required to communicate with up to eight
detecting channels. The addition of extra Input Modules therefore requires only a simple software
configuration change to monitor the additional channels.
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