Phonetics Skymetry WTU-14, User Manual

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Important Information and Warnings
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It may take several minutes for the peer-to-peer command to
reach the destination Skymetry WTU-14.
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Peer-to-peer commands are processed in a sequential, non-pre-
determined order. This means that if more than one command
is triggered, the subsequent commands must wait until the cur-
rently processed command is finished. If two peer-to-peer com-
mands are triggered simultaneously that affect the same output,
the order of the processing cannot be guaranteed.
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Both the source and destination WTU-14 devices must be pow-
ered on and operational for peer-to-peer commands to operate
correctly.
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If the unit is in the middle of alarm processing, peer-to-peer
commands may be delayed while alarms are being sent.
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Peer-to-peer commands are not processed while logged in with
the PC software. The user should log off and the serial cable
should be unplugged during normal operation to ensure that
peer-to-peer commands are properly processed.
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Setting peer-to-peer trigger values too close can cause output
oscillations. Peer-to-peer commands are an advanced feature
and should be well thought out. Do not use them for critical
applications where the risk is unacceptable.
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All peer-to-peer control actions will use a wireless message
packet.
Sample Application
Suppose you had a well and a pump which were several miles apart.
When the pump runs, it fills the well. Your goal is to maintain a
certain level in the well. If you place one WTU-14 unit at each loca-
tion you can have two peer-to-peer events accomplish your goal. In
addition, you can use the WTU-14 inputs to monitor other key items
such as:
• well level too low
• well level too high
Chapter 7: Machine-to-Machine Control
61