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P100002807 A
If the distance between the EY-modulo4 Room Operating Unit and the controller
(stub length) is less than 3m a bus topology should be used. If the stub length is
greater than 3m a free topology in a daisy chain must be used.
The communications jack for both the EY-modulo4 Room Operating Units support
mono and stereo audio cables.
Maintenance
6
WARNING
Danger of electrocution
Turn off power before any kind of servicing.
f
Each controller requires minimal maintenance, but it is important to take note of the following:
If it is necessary to clean the outside of the front plate and/or the inside of the back plate,
•
use a dry cloth.
Verify the tension of all wires and cables whenever the controller is serviced.
•
Disposal
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Products must be disposed of at the end of their useful life according to local regulations.
Troubleshooting guide
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Device communicates well over a short network, but does not communicate on large
network
Network length
Check that the total wire length does not exceed the
specifications of the Junction Box and Wiring Guideline for
Twisted Pair LonWorks Networks.
Wire type
Check that the wire type agrees with the specification of the
Junction Box and Wiring Guideline for Twisted Pair LonWorks
Networks.
Network wiring problem
Double check that the wire connections are correct.
Absent or incorrect network
termination
Check the termination(s). Incorrect or broken termination(s)
will make the communication integrity dependent upon a
device’s position on the network.
Extra capacitance
Make sure that no extra capacitance is being connected to
the network other than the standard FTT circuit and that there
is a maximum stub length of 3m in bus topology.
Number of devices on
network segment exceeded
The number of devices on a channel should never exceed 64.
Use a router or a repeater in accordance to the Junction Box
and Wiring Guideline for Twisted Pair LonWorks Networks.
Network traffic
Query node statistic to check errors. Use a LON protocol
analyzer to check network traffic.
