User's Manual

CHAPTER2
ConfiguringanA753intheTelemetry Gateway
16
This completes the installation of your A753. If the SOLAR CELL
connector or the DC INPUT connector is left unused, use the cap
provided to protect it against moisture and dust. Be sure to keep the
following information in a place you can remember:
• Serial number of the A753 (printed on the type plate)
• Location of the A753
Note: This information will be necessary during the configuration of the
device at the A850 Gateway.
MoreabouttheLEDTool
The LED tool allows you to rapidly check the status of an A753. After
you insert the LED tool into the SOLAR CELL connector, the unit tries
to reconnect to the A850 gateway configured previously on the A753.
Table 1 on page 17 describes the LED blinking codes for the A753.
If the A753 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 level drops below 5.6 volts, the unit will enter
the misery state. In this state the unit reduces its activities to a
minimum. The GSM/GPRS module 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.
Furthermore, when the internal battery level drops below 5.2 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 A753 when the unit shut down,
the LED tool will restart the A753, which will initiate a shutdown again.
If this happens to you, disconnect the LED tool and replace/recharge
the battery. (This does not apply if a solar panel is connected to the
SOLAR connector.)
ConfiguringanA753intheTelemetryGateway
To configure the A753 with an A850 Telemetry Gateway, refer to the
A850 Telemetry Gateway User's Guide.
MaintainingandservicingtheRTU
An A753 Series 4 addWAVE 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 either the addWAVE RTU or the
sensors be exposed to the environment for extended periods of time
as this will seriously degrade their functionality.