Westermo MRD-315 - Manual (Page 18)

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LED Indicators
LED Status Description
STS
Status
RED No wireless network has been detected
RED FLASH A wireless network has been detected
GREEN Power up self test OK/no issues
NET
NET 1
NET 2
Network indicator
OFF Not ready
RED RF circuitry initialising or network
registration fault
GREEN/RED Network connection fault
GREEN FLASH Searching for network
GREEN Locked to network
GREEN 1 BLINK
Signal strength indication
1 Very poor
3 Normal
6 Very good
GREEN 2 BLINKS
GREEN 3 BLINKS
GREEN 4 BLINKS
GREEN 5 BLINKS
GREEN 6 BLINKS
Status Indicator
The status indicator reports the health of the unit. In normal operation, the indicator will
be green, if a fault is detected either at boot-up or during normal operation the indicator
will light red. When the unit is first switched on or is reset, the indicator will first light
red, then flash red in sequence with the Network Indicator, this is normal behavior during
boot-up and does not indicate a fault. The indicator will light red or green a short time
after power is applied. If the indicator does not light when power is applied check the
power supply voltage and connections.
Network Indicator
There are network indicators one for each SIM, i.e. MRD-315 (NET), MRD-355/455
(NET1, NET2) The indicator reports the status of the connection to the network. When
powered up the indicator will be off, the indicator will then flash green whilst the unit
searches for a network, once connected to the network the indicator will light green.
Once a network connection has been established the Network Indicator reports the
level of the received RF signal as well as any network connection faults. The signal
strength is indicated by the number of green flashes of the indicator within an indicator
period. Each indicator green flash will be followed by a short off time, an extended off
time indicates the end of the indicator period. So an indicator period starts with a green
flash followed by up to 5 additional flashes, then an extended off time, the cycle will then
repeat. The maximum number of flashes in an indicator period is 6. The indicator may
be red during the extended off time following the green flashes, this indicates a network
connection fault. The indicator will flash red if a SIM card is not present and will be solid
red if the RF circuitry is restarting, network registration has failed or the RF signal level is