ECLYPSE User Guide 169
Table 16-3: STATUS LED Interpretation for Normal Operation with ECB Devices
Device STATUS LED blink
patterns
The device is starting up.
The STATUS LED is always
OFF (Not applicable to
ECB-PTU Series)
Table 16-4: Verify that the Following Recommendations have been Carried Out
Before Calling Technical Support
Properly terminate the BACnet
MS/TP data bus
EOL terminations must be enabled / installed at either end of the
data bus only. See Figure 11-2.
Avoid duplicate MAC Addresses
Verify that no device has a duplicate MAC Address by checking
the MAC Address DIP switch settings on all devices on the data
bus, including segments connected by a repeater.
If necessary, isolate devices from the data bus to narrow-down
the number of devices that may be at fault.
All devices must be set to the
same baud rate
When all devices are set to AUTO baud rate, at least one device
must be set to a baud rate, usually the data bus master. See
Maximum Number of BACnet MS/TP Devices on a Data Bus
Segment and Baud Rate on page 112.
The data bus is polarity
sensitive
Ensure that the polarity of all data bus wiring is consistent
throughout the network. See BACnet MS/TP Data Bus is Polarity
Sensitive on page 110.
Do not overload the data bus
with Change of Value (COV)
reporting
COV reports create the most traffic on the BACnet MS/TP data
bus. Set the COV report rate to the largest value that provides
acceptable performance. Only map COV reports for values that
are necessary. For mapped analog points that are continuously
changing, try increasing the COV increment on these points or set
the COV minimum send time flag to true to send the value at a
regular frequency.
Do not leave address holes in
the device’s MAC Address
range
Assign MAC Address to device starting at 3, up to 127. Do not
skip addresses. Set the maximum MAC Address in the ECY
Series Controller to the final MAC Address number actually
installed.
NOTE: The physical sequence of the MAC Address of the
devices on the data bus is unimportant: For example, the MAC
Address of devices on the data bus can be 5, 7, 3, 4, 6, and 8.
Only daisy-chained devices are
acceptable
Eliminate T-taps and star configurations. Use a router to connect
a data bus spur.
Connect no more than five
devices to a power supply
transformer (for 24V controllers)
BACnet MS/TP devices require good power quality. See Power
Supply Requirements for 24VAC-Powered Controllers on page
130.
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