User's Manual
Table Of Contents
CHAPTER2
ConfiguringanA753intheTelemet ryGateway
10
A broadcast is sent to other stations when you plug in the LED tool.
Wait approx. 30 seconds for completion of this broadcast, but look at
the LED tool.
If the A753 is heard by another RTU
, it will receive an answer from
that station. When the broadcast is completed, the LED tool will make
a long flash to signal this event. Then, for every other received RTU,
the LED tool will make a short flash. Simply count the flashes and you
know how many station can be reached from this RTU (we call it
connectivity test).
After this connectivity test, 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 v
olts, the unit will enter
the misery state. In this state the unit reduces its activities to a
minimum. Communication over the serial communication cable is not
possible. 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 comple
tely off, effectively decoupling itself from
the battery in order to protect it.
Table 1. LED Tool Blink Codes
State Blink Code Description
Misery mode Short flash every second Battery voltage below 5.5V
bu
t above 5.0V. Sensors are
not sampled.
Normal mode Short flash every 1/2
se
cond
RTU voltage is > 5.5V. RTU
is up and running.
Broadcast Long flash and then one
shor
t flash for every
heard station
Connectivity test
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.)
ConfiguringanA753intheTelemetryGateway
To configure the A753 with an A850 Telemetry Gateway, refer to the
A850 Telemetry Gateway User's Guide.