LAARS’ ProtoNode Startup Guide
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Appendix A.5. LED Diagnostics for Modbus RTU Communications Between ProtoNode and
Devices
Please see the diagram below for ProtoNode FPC-N34 and FPC-N35 LED Locations.
Tag
Description
SPL
The SPL LED will light if the ProtoNode is off line.
RUN
The RUN LED will start flashing 20 seconds after power indicating normal operation.
ERR
The SYS ERR LED will go on solid 15 seconds after power up. It will turn off after 5 seconds. A
steady red light will indicate there is a system error on ProtoNode. If this occurs, immediately report
the related “system error” shown in the error screen of the GUI interface to FieldServer Technologies
for evaluation.
RX
The RX LED will flash when a message is received on the host port.
TX
The TX LED will flash when a message is sent on the host port.
PWR
This is the power light and should show steady green at all times when ProtoNode is powered.
Diagnostic LEDs
Figure 27: Diagnostic LEDs
LAARS Heating Systems
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