User Interface - Hitachi SJ/L-EN Ethernet Communications Module Instruction Manual

User Interface

The SJ/L-EN has seven LEDs to convey module status and activity.
Four LEDs next to the RJ45 connector:
• STATUS (GREEN) – This LED will be ON whenever the SJ/L-EN is receiving proper power from the
inverter and the self diagnostics have shown the board to be functioning normally.
• LINK (GREEN) – This LED is ON when the SJ/L-EN is receiving valid Ethernet pulses.
• ACTIVITY (GREEN) – This LED is ON whenever there is Ethernet traffic in the cable.
• ERROR (RED) – This LED will be ON if the SJ/L-EN has failed due to a hardware watchdog timeout, or
the Ethernet communications has been absent for the software watchdog timeout period.
Two LEDs near the right edge of the board:
• RTS – This LED indicates communication between the SJ/L-EN to the inverter through the serial port.
• TXD – This LED indicates communication from the SJ/L-EN to the inverter through the serial port.
• RXD – This LED indicates communication to the SJ/L-EN from the inverter through the serial port.
(All three of these LEDs should be rapidly blinking; if not, there may be a problem with the connection.)
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Chapter2