LAARS’ ProtoNode Startup GuidePage 34 of 43Appendix A.5. LED Diagnostics for Modbus RTU Communications Between ProtoNode andDevicesPlease see the diagram below for ProtoNode FPC-N34 and FPC-N35 LED Locations.Tag DescriptionSPL 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.ERRThe SYS ERR LED will go on solid 15 seconds after power up. It will turn off after 5 seconds. Asteady red light will indicate there is a system error on ProtoNode. If this occurs, immediately reportthe related “system error” shown in the error screen of the GUI interface to FieldServer Technologiesfor 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 LEDsFigure 27: Diagnostic LEDsLAARS Heating SystemsPage 34 of 4320 Industrial Way, Rochester, NH, USA 03867 • (800) 900-9276 • www.Laars.com
