Eaton 455U-D, User Manual

Page: 58 / 83

Chapter Four Troubleshooting
Man_455U-D Rev 3.05 Page 59
4.2 LED indication Diagnostics Chart
INDICATOR CONDITION MEANING
OK LED OFF Continuously

Power supply failure

Battery Supply Overvoltage
OK LED RED Briefly

Module Out of buffer memory (Host device ignores
CTS)

Low Supply Current during transmit (Modem resets)
OK LED RED Continuously
–
from startup

CPU Failure

Radio module fault.

Low Supply Voltage (< 7V)

Corrupted Configuration file
OK LED RED Turns red after
startup

CPU Failure

Low Supply Voltage (< 7V)
OK LED FLASHING Flashes
red/green twice
per second

Low Supply Voltage (< 10.7V)

Modem is in low power mode
– DTR control.
OK LED GREEN Continuously

Normal Operation
Radio TX LED ON Flashes briefly

Radio transmitting
Radio RX LED
GREEN flashes

Radio receiving data
Radio RX LED RED flash

Radio Receiving data - Weak radio signal
Baud Setting Signal Strength
B0 Less than -111 dBm
B1 Less than -108 dBm
B2 Less than -105 dBm
B3 Less than -100 dBm
RS232 LED ON Orange flash RS-232 port receiving and transmitting simultaneously
Red flash RS232 serial port transmitting data to host device
Green flash RS232 serial port receiving data from host device
Orange flash
†
RS232 Serial Port Activity (Older version Hardware)
†
RS485 LED ON Orange flash RS-485 port receiving and transmitting
Red flash RS485 serial port transmitting data to host device
Green flash RS485 serial port receiving data from host device