RXT-300 SmartWireless™
RXT-300 Wireless IM
Rev. 2.0
Page 20 of 41
Alarm Reset
Only valid for Alarm Outputs with Latched property set.
Will de-activate an Alarm Output that is Latched, but NOT if there is an existing Alarm.
After alarm reset, a new Alarm event will cause latching of Alarm output again.
Alarm Silence
Only valid for Alarm Outputs with Silence-able property set.
Will de-activate any Alarm Output, Latching or non-Latching.
After alarm silence, a new Alarm event clears silence and will re-active Alarm Output.
NOTE:
On an HMI Panel, the front panel LEDs, that indicate Alarms, will ignore Alarm
Silence.
3.6.2
Alarm Inhibit
Alarm Inhibit allows the user to force all Alarm outputs to an in-active state for a period of time. It can be
used to prevent invalid alarms from occurring if the user is performing maintenance on the system. On the
HMI Panel the Alarm Inhibit menu allows the user to input an amount of time to inhibit Alarms in minutes.
There is a Start / Stop in this same menu that starts the timer. This command is sent to the rest of the network
and all RXT-300s would disable their Alarm outputs and begin a countdown. When the time is complete the
Alarm outputs would be enabled again and immediately would start outputting any alarm conditions. If the
user is done with maintenance of the system prior to the timeout, an Alarm Inhibit stop command can be given
which would disable Alarm Inhibit.
3.6.3
Alarm Test
Alarm Test is used to test all Alarm thresholds and outputs in a system. Placing the RXT-300s in Alarm test
causes every RXT-300 with sensors to increment sensor values in 5% increments and when the range is
reached it will then decrement by the same amount. These values increment based upon the RXT-300s poll
cycles (not time). The HMI Panel will display the incrementing / decrementing values as well as Alarm
conditions.
3.6.4
RF Silence
RF Silence is used to force all RXT-300s to disable their transmit functions and only allow receive. It is a
manual ON/OFF function that can be executed from any HMI Station. It allows a user to shut down the
wireless network at periods of time where wireless communications could be hazardous. If RF Silence is
turned ON, the network would be completely shutdown and no sensor updates would occur during this time.
The RXT-300s are capable of receiving and consequently when RF Silence is turned OFF, a command is sent
to the rest of the network that starts the wireless network back up again.
Since this function can be a critical one, powering the RXT-300s during RF Silence is also critical. If powered
by battery, there must be enough life in the battery to maintain RF Silence for that period. If there is not the
RXT-300 will loose power momentarily when the battery is low and then may come up again long enough to
transmit some startup messages wirelessly. This may happen multiple times until the battery is depleted.
If a RXT-300 is in silence mode and a RXT-300 looses power momentarily, the RXT-300 will restart and will
communicate briefly with the network. It will determine from the rest of the network that RF Silence is ON
and will shut down its transmitter immediately. This was implemented to try to recover from any unforeseen
power events during RF Silence with a minimal of wireless traffic.
