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C O M M U N I C A T I O N S
6.3.2 System Fault LEDs
6.3.3 "SYSTEM OK" Indicators on Remote Units
6.3.3.1 During Normal Operation
6.3.3.2 Fault Diagnosis using the "SYSTEM OK" Indicator
OmniCare issue 1
Refer to "System Status & Fault LEDs" on page 9 for further
information if a System Fault LED is lit.
The "SYSTEM OK" Indicator shows the status of Remote Unit.
During Normal Operation two "monitoring messages" are
regularly sent around the loop from the Control Panel.
The first message originates from the "A" connection of the panel,
and causes the Remote Units to turn their indicators ON. The
second message is sent from the "B" connection of the panel and
causes the units to turn their indicator OFF.
This means that on a system with no cable faults the indicators
should flash briefly once every 1.5 seconds.
• If the Data cable is damaged, Remote Units up to the break
(starting from the "A" connection) will have the indicators
ON and those after the break will have their indicators OFF,
since they will only receive on or off messages.
• If the Remote Unit is not receiving any data it will flash the
indicator fast (approximately once a second) with equal on
and off times.
Data faults can be located by watching the indicator: if it stays ON
occasionally then there is an intermittent fault on the "B" side of
the loop, but if it does not light occasionally then the "A" side of
the loop has an intermittent fault.
OmniCare EVC System
Installation & Commissioning Manual
81
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