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700 - Axiom-Installation and Maintenance Guide –Original - 30 Oct 2014
1.2.3 Sensor and telemetry connections
The Axiom datalogger is watertight, even without connectors attached. Device connectors (sensors and
telemetry) are circular metal shell, bayonet, military style connectors which are uniquely keyed and
colour coded to minimize erroneous connections. When connecting the various devices to the
datalogger, ensure that the connectors are dry and free of debris so that no water or dirt gets trapped
between the connectors. Connector pin-outs and sensor input specifications are defined in
Specification section of this manual.
1.2.3.1 Connecting dedicated sensors
Some Axiom datalogger models have dedicated connector inputs for a variety of sensors:
Wind speed (red)
Wind direction (yellow)
Air temperature and humidity (red)
Rain (blue)
Fuel Stick moisture and temperature (yellow)
These sensors (when purchased from FTS) are supplied with a colour coded, military style connector
which plug in to the matching connector on the datalogger.
1.2.3.2 Connecting SDI sensors
SDI sensor connector inputs are colour coded orange. Axiom dataloggers support SDI sensors from a
variety of manufacturers. If the sensor was supplied by FTS with a datalogger then it will be
programmed with its final parameters and system address. Otherwise you must remember to program
the sensor to its final address and set up any programmable characteristics that you need. The
procedure to do this varies from manufacturer to manufacturer. Alternately, you can arrange to send
your sensor to FTS for programming and connector installation.
Remember, to avoid incorrect or missing sensor readings, set the sensor address, command, and
reading field information in the datalogger’s SDI sensor configuration for the desired sensor reading.
SDI sensors supplied by FTS have a colour coded, three pin, waterproof, military style connector
attached, so all that is necessary is to connect the sensor to the datalogger and set the sensor’s
configuration in the datalogger.
If you have a sensor with bare wires, it is necessary to solder the correct connector to the cable. See the
Specifications section for the correct connector and pin-out.
If you are using junction blocks for signal and power distribution, it is very important that any junctions
be in a dry, condensation free environment. If the junction is in a damp location, then there is
accelerated corrosion of the wires and connections, and the communications with the sensors becomes
unreliable or fail.
1.2.3.3 Connecting telemetry
The Axiom datalogger has a built-in power management system which provides power to the telemetry
device connected to either front panel TELEMETRY port. Connector pin-out and signal definitions are
