User's Manual
CHAPTER2
ConfiguringanRA440inthetelemetrygateway
19
MoreabouttheLEDtool
The LED tool allows you to rapidly check the status of an RA440. After
you insert the LED tool into the SOLAR CELL connector, the unit tries
to reconnect to the A850 gateway configured previously on the
RA440. Table 1 on page 17 describes the LED blinking codes for the
RA440.
If the RA440 is not connected to the A850, the unit flashes rapidly to
let you know the unit is alive. These flashes occur every half second.
If the internal battery levels drop below 5.6 volts and the external
battery drops below 11 volts, the unit will enter the misery state. In
this state the unit reduces its activities to a minimum. The radio unit is
turned off, the GPRS connection to the A850 gateway is terminated,
and communication over the serial communication cable is impossible.
Only the internal real-time clock is maintained and the power
management functions are performed.
If the internal battery levels drop below 5.2 volts and the external
battery drops below approximately 10 volts, the system switches
completely off, effectively decoupling itself from the battery in order to
protect it.
Note: If the LED tool was connected to the RA440 when the unit shut down,
the LED tool will restart the RA440, which will initiate a shutdown
again. If this happens to you, disconnect the LED tool and replace/
recharge the batteries. (This does not apply if a solar panel is
connected to the SOLAR connector.)
ConfiguringanRA440inthetelemetrygateway
To configure the RA440 with an A850 Telemetry Gateway, refer to the
A850 Telemetry Gateway User's Guide.
Maintainingandservicingtheremotewirelessmodem
An RA440 needs virtually no maintenance. It is waterproof and
designed to withstand harsh environmental conditions (-30 to +70 °C,
or -22 to 158 °F), high RH values, water, and other non-corrosive
liquids. It conforms to the European protection class IP65. This applies
also to the connectors, as long as they are mated. Don’t let unmated
connectors on the RA440 be exposed to the environment for extended
periods of time as this might seriously affect their functionality.
TheRA440internalbatteries
The internal batteries supply 6.2 volts and consist of one or two NiMH
packs.
Note: The RA440 is shipped with one battery pack, but will hold two packs.
The book documents the use of the RA440 with two NiMH battery
packs.