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Radio/Serial Telemetry Module User Manual
Page 22 © March 2000
Chapter Three OPERATION
3.1 Power-up and Normal Operation
When power is initially connected to the module, the module will perform internal diagnostics to
check its functions. The following table details the status of the indicating LED’s on the front panel
under normal operating conditions.
LED Indicator Condition Meaning
OK On Normal Operation
RX Occasional flash Radio Receiving, or
Activity on serial ports
RX Flashes continuously Configuration Mode
RX On Button press when entering
Configuration Mode
TX
(only on U units)
Occasional flash Radio Transmitting
PWR On Supply voltage available
from Solar Panel or
SUP1/SUP2
OK Flashes every 5 seconds +24V Supply
overloaded
Additional LED’s provide indication of the status of digital inputs and outputs. LED’s display the
status of each digital input (lit for active), and LED’s display the status of each digital output (lit for
active). Other conditions indicating a fault are described in Chapter Six Troubleshooting.
The module monitors the power supply and provides status of supply failure and battery low
voltage for "mapping" to one of the module's own outputs or transmitting to a remote output.
When the module is powered from a normal supply (i.e. via either of the “SUP” terminals), the
PWR LED indicator is lit. When the modules is powered from a solar panel and battery, the PWR
LED indicator is lit only when the charge current is available (i.e. when the solar panel is receiving
light). In the event of excessively low battery voltage (10.8V), the OK LED will go off, the unit will
automatically set all outputs off, and disable the +24V analogue loop supply. the OK LED will turn
on again after the battery voltage exceeds 11.3V. This enables installations to be configured so that
the battery current drain is minimised in the event of extended mains failure, reducing the possibility
of deep discharge of batteries.
3.1.1 Communications
If transmissions are not successful, then the module will re-try up to four times at random intervals
to transmit the message. If communications is still not successful, the “Comms Fail” internal status
will be set. In the default configuration, this will have no consequence and the module will continue