Annunciator Overview,
Continued
System Condition (Continued)
l
Communication Failure - The LCD COMM LOSS condition is annunciated
locally by activation of the Piezo alert signal and TROUBLE LED and displayed
on the Graphical LCD Annunciator screen as shown in Figure 11.
Communication lost
with system's Master
Alarms=0
Priority2=0
Supervisory=0
Trouble=1
Figure 11. “LCD Comm Lost” Message Display
The LCD COMM LOSS condition requires an acknowledgment.
The -BL ACK>
key is used to acknowledge this condition.
If there are any alarm, priority 2, supervisory or trouble conditions in the system at the
time of communication loss, you will be able to scroll through those points already in
the graphical LCD annunciator. After a 30-second time-out, the display reverts back to
the COMM LOST message.
The display is back-lit to improve readability, especially in dark ambient lighting
conditions. You can change the display’s contrast by adjusting Potentiometer R44 on
the Graphical LCD Annunciator card. (See Figure 6.)
In the case of AC power loss, the LCD display is back-lit if there is an ALARM
Condition present in the system and on any key press; otherwise it will be OFF.
Continued on next page
19
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