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Disconnecting Power from the NIE
When 24 VAC supply power to an NIE is disconnected or lost, the NIE is nonoperational, but the POWER LED
remains On and the data protection battery continues to power the NIE for approximately 1 to 5 minutes while volatile
data is backed up in nonvolatile memory. The RUN LED goes Off when data backup and shutdown are complete.
Important: The data protection battery must be installed and charged before disconnecting the 24 VAC supply
power.
Setting the End-of-Line Switch
RS485 serial protocol bus segments require proper EOL termination to reduce interference from signal bounce back
on the bus segment.
FC Bus (MS/TP and Modbus RTU) applications require a terminated device at each end of each FC Bus segment.
See the
Wiring Rules and Guidelines for Network Integrations
section for more information on EOL requirements
on an FC Bus.
N2 Bus applications require at least one terminated device on each N2 Bus segment, but two terminated devices,
one at each end of the N2 Bus segment, are recommended. See the
Wiring Rules and Guidelines for Network
Integrations
section for more information on EOL requirements on an N2 Bus.
The NIE is shipped with the EOL switch in the factory default, ON (up) position
(Figure
12). See
Figure 13
to determine
the appropriate EOL switch setting for the NIEs on N2 Buses, FC Buses, and Modbus RTU buses.
Figure 12: FC Bus EOL Switch in the Factory Default ON (Up) Position
Figure 13: EOL Switch Setting N2 or MS/TP
Troubleshooting
LED Status Indicators
The NIE models have up to 11 LEDs (depending on the model) to indicate power and network communication status.
Figure 14
shows the LEDs and
Table 11
describes the LED indications.
NIE39/NIE49 Installation Instructions
16
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