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Network output variable nvoHgmZoneThresh displays the following information for
the zone specified by nviGetZoneThresh:
1. Zone (1-16) whose alarm thresholds are being displayed
2. Leak Alarm Threshold in PPM (0-65535)
3. Spill Alarm Threshold in PPM (0-65535)
4. Evacuate Alarm Threshold in PPM (0-65535)
To change the Leak, Spill, or Evacuate alarm thresholds for a zone, use the
nviSetZoneThresh input network variable as described earlier.
Operating Limitations When Using RDM800 Remote Display
When an RDM800 remote display is used, LonWorks will have access to the HGM300 as
long as the RDM800 is in either the SYSTEM or ZONE VIEW screen. If the RDM800 is
set to display any other screen, it will respond to polls from the LonWorks adapter with
an HGM BUSY exception code. The LonWorks adapter will handle the exception by
setting all the zone statuses = HGM BUSY. When the RDM800 is returned to the
SYSTEM or ZONE VIEW screen, normal LonWorks monitoring will resume.
If the operator leaves the RDM800 in some screen other than SYSTEM or ZONE VIEW
for an extended period of time (10 minutes default), the RDM800 times out and
automatically returns to either the SYSTEM or ZONE VIEW screen. This will restore
normal LonWorks monitoring.
Communications LED Indicators
See Figure 4 for the locations of the communications LED indicators.
The communications adapter board has four LED communications status indicators
numbered 1-4. The meanings of these indicators are as follows:
LED 1 ON: Adapter is transmitting a poll/command to the HGM300
LED 2 ON: Adapter is receiving a response from the HGM300
LED 5 ON: Adapter internal communications (response from RCM CPU
to Neuron CPU)
LED 6 ON; Adapter internal communications (poll/command from Neuron CPU
to RCM CPU)
Under normal conditions, LEDs 5 and 6 will show a burst of alternating blinks about
every 8 seconds. This indicates that the two processors internal to the LonWorks adapter
are communicating with each other normally. Occasionally LEDs 5 and 6 will blink
more frequently if commands (to change alarm thresholds, for example) are coming in
from the LonWorks network.