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OLCT 200 User Manual |
56
intermittent communication failures are a result of this monitor having problems
receiving the Server’s beacon. The duration and frequency of “out of range” conditions
are stored in the Event Log table described in Section 6.4. Low Battery conditions also
flash the FAIL led.
It is important to understand RS icons only update as the TXD LED flashes indicating
an RF transmission has occurred. RF transmissions are typically each 5-minutes, but
increase to each 6-seconds during alarm conditions.
6.3 RF Comm Cycle and Power Consumption
Wireless systems are often battery powered therefore power consumption must be
kept low. Most
OLCT 200’s power is consumed as the radio communicates to the
wireless network. Each Comm cycle consists of the following operations: Awake the
radio in receive mode; listen for the Server’s beacon; synchronize to the Server’s
hopping frequency to become “In Range
”; transmit data packet out the antenna and
return to sleep mode. This sequence takes from .25 to 1 second to complete. If the
radio fails to synchronize hopping upon the initial attempt it waits 6 seconds and tries
again, then waits 6 seconds and tries once more. If the third attempt fails the “Out of
Range
” icon appears and OLCT 200 returns to its Comm cycle. Out of range will
also be logged into the Event Log.
Every 6-
seconds, the monitor performs a “sniff test” to detect level of target gas
present at the sensor. At each “sniff test”, the
Zzz
’s “Sleep Mode” icon is briefly
replaced by an RS icon as described above in section 2.2.1. At this time the readout
updates to indicate gas value measured at the “sniff test”. The radio stays OFF if the
gas value does not trip A1 or A2 alarms. Except when the
Wakeup Time
menu
expires (maximum of 5-
minutes) the radio turns on, receives the Server’s beacon, and
transmits its data. These 5-minute transmissions allow theWX series controller to
confirm a good wireless comm link even when no alarms exist. If A1 or A2 alarms do
exist during the “sniff test”, the radio wakes, receives the Server’s beacon, and
transmits its data immediately.
The following list identifies each of the conditions that cause the radio to transmit:
Every 5-minutes (or faster depending upon
Wakeup Time
menu in section 6.7) when
there is no A1 or A2 alarm. Important since the receiving controller reports “Comm
Error” if the monitor does not reply for periods of greater than 18-minutes. A3 and FAIL
alarms do not increase radio transmission rates.
Every 6-seconds if there is an A1 or A2 level alarm.
Upon entry into CAL MODE a 75 counts value (-15.6% FS) is transmitted. Receivers
indicate “IN CAL” when 75 counts is the input for a channel (200 to 1000 counts
represents 0 to 100% of full scale).
Upon ENTRY into CAL PURGE a 200 counts value (0% FS) is transmitted. NOTE: To
prevent A1 & A2 low trip alarms, oxygen ranges transmit 20.9% readings upon entry
into CAL PURGE.
Summary of Contents for OLCT 200
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