455U-D Radio Modem
User Manual
Page
48
©
Jan 2016
3.8.4 Dual Redundant Indications
To check the state of the Dual redundant system, you can:
Observe the DIO LEDs on the two modules. These LEDs should be flashing together.
Refer to the following table to diagnose the flashing LEDs (Firmware version 3.03 and
later)
Primary OK
LED
Primary DIO
LED
Secondary
OK LED
Secondary
DIO LED
System Status
Green
Flash
½ Sec Off,
1½ sec On
Flash
½ Sec Red,
1½ sec Green
Flash
½ Sec Off,
1½ sec On
Normal Operation. Primary is active. Secondary is
ready to take over
Flash
1 sec Red,
1 sec Green
Flash
1 sec On,
1 sec Off
Red
Flash
1 sec On,
1 sec Off
Secondary Fault. Primary is active. Secondary may be
able to take over if primary fails completely
Flash
1 sec Red,
1 sec Green
Flash
1 sec On,
1 sec Off
Fast Flash
0.4 sec Red,
0.1 sec green
Off
Secondary Low voltage shutdown. Primary is active.
Secondary cannot take over if Primary fails.
Flash
1 sec Red,
1 sec Green
Flash
1 sec On,
1 sec Off
Red
Off
Secondary Module Failure. Primary is active.
Secondary cannot take over if Primary fails.
Flash
1 sec Red,
1 sec Green
Flash
1 sec On,
1 sec Off
Off
Off
Secondary No Power. Primary is active
Red
Flash
2 sec Off,
½ sec On
Green
Flash
2 sec Off,
½ sec On
Primary Fault. Secondary is active. Primary may be
able to take over if Secondary fails completely.
Red
Flash
2 sec Off,
½ sec On
Flash
2 sec Red,
½ sec Green
Flash
2 sec Off,
½ sec On
Primary Fault and Secondary Fault. Secondary is
active. Primary may be able to take over if secondary
fails completely.
Fast Flash
0.4 sec Red,
0.1 sec green
Off
Green
Flash
2 sec Off,
½ sec On
Primary Low voltage Shutdown. Secondary is active.
Primary cannot take over if Secondary fails.
Fast Flash
0.4 sec Red,
0.1 sec green
Off
Flash
2 sec Red,
1/2 sec Green
Flash
2 sec Off,
½ sec On
Primary Low Voltage Shutdown and Secondary Fault.
Secondary is active. Primary cannot take over
Red
Off
Green
Flash
2 sec Off,
½ sec On
Primary Module Failure. Secondary is active
Red
Off
Flash 2 sec
Red, ½ sec
Green
Flash
2 sec Off,
½ sec On
Primary Module Failure and Secondary Fault.
Secondary is active.
Off
Off
Green
Flash
2 sec Off,
½ sec On
Primary No Power. Secondary is active
Off
Off
Flash
2 sec Red,
½ sec Green
Flash
2 sec Off,
½ sec On
Primary No Power and Secondary Fault. Secondary is
active.
Other
Incorrect Configuration or Wiring error