Hardware reference guide

Modbus Plus NOM
35013379 02 October 2007 293
LED Indicators
and Descriptions
The following figure shows the Modbus Plus on Fiber LED indicators.
The following table shows the Modbus Plus on Fiber LED descriptions.
LED Descriptions
LEDs Color Indication when On
Ready Green The module has passed powerup diagnostics.
Run Green Indicates that the unit is in kernel mode – should always be OFF
during normal operations. Note: The table for the NOM 21X 00
shows the number of times the RUN LED on the Modbus Plus on
Fiber Module blinks for each type of error and the crash codes for
each (all codes are in hex).
Modbus Green Indicates communication is active on the single RS-232 serial port.
Modbus+ Green Indicates communication is active on the Modbus Plus port.
Fport1 Green Indicates an optical signal has been received on fiber optic Port 1.
Fport2 Green Indicates an optical signal has been received on fiber optic Port 2.
FRNGoff Red Indicates the first break in a self healing ring.
Ready
Modbus+
Run
Modbus
Fport 1
Fport 2
FRNGoff
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com