Manual

WI-I/O 9-x_WI-I/O-EX-1-S-x 2.16 Page 27
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 WI-I/O 9-x 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 module 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).
If a backup battery is connected, the module will generate a low battery voltage status when the voltage
has dropped to 11.3V for approx 45 seconds. This status may be transmitted to another module. 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 analog loop supply. The OK LED will turn on again after the
battery voltage exceeds 11.8V. 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
Before each transmission, the WI-I/O 9-x radio will “listen-before-transmit” to make sure that another