Omega Vehicle Security Wireless Sensor System zSeries - Manual (Page 84)

Appendix G Frequently Asked Questions (FAQ) (continued)
Q: The Chart trend line for all the variables are broken, what could be wrong?
A: It indicates that a TCP connection to the Coordinator was timed-out and no data was
obtained. Make sure the Coordinator is still on in the network and powered up. If there
are too many broken lines, it may indicate that the network load is too heavy.
Q: The trend line for one of my sensors inside one End Device is broken, what could be
wrong?
A: It indicates that TCP connection to the Coordinator is good but the Coordinator did
not have any readings from the corresponding End Device. Make sure End Device is still
blinking according to the update rate. It could be caused by a reset/power cycling of the
Coordinator as well.
Q: Nothing happens when I click on the Save Current Graph button, what could be
wrong?
A: The Java policy file is not setup properly. Make sure you get a Java policy file and
copy it to a folder in the host computer. Then input the java runtime argument in Java
Setup (Control Panel) with the appropriate path to the policy file. Close all web browser
and re-open the applet again. See Java Setup Section.
Q: Nothing is shown inside the Diagnostic page/applet, what could be wrong?
A: The first thing you want to try is to click your mouse right inside the box. Then
minimize and restore the web browser. Try to move the scrollbar as well. If nothing works
after about a minute, check the TCP connection to the Coordinator.
Q: The End Device repeatedly makes 4 blinks every 2 seconds and then goes off for 3
minutes, what does this mean?
A: It is equivalent to getting a "Lost" message in the Java applets. It means that the End
Device found the Coordinator when it was powered on, but it cannot communicate with it
currently. Make sure the Coordinator and the End Device have the same Network ID
(NID). Also, make sure the Coordinator is powered on, the IEEE802.15.4 communication
channel is unchanged, the first DIP switch (of the 8-DIP switch row) on the Coordinator
was on during the last Coordinator’s power reset, and there is no obstructive objects
blocking the communications path (see Section 5 for more details). If the obstructive
object is only temporary, you will get the sensor readings once the path is open.
Q: While the End Device is up and running I notice a sequence of blinking patterns that
seem to repeat themselves, what could be wrong?
A: It means that the End Device needs several retransmissions before getting an
acknowledgement packet back from the Coordinator. This indicates a reduced
performance since more retransmissions required. Retransmissions consume power and
cause shorter battery lifetime. Adjust the antenna and relocate the End Device for better
communications. See Section 5 for more details.
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