Gill Instruments WindObserver II User Manual

Gill Instruments Ltd
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WindObserver II Page 36 Issue 18
Doc. No. 1390-PS-0004 January 2009
8.11. Analogue outputs and options
Analogue outputs are available as an option on the WindObserver II.
See Section 6.5 for connection details, and Section 9.5 for configuring the
analogue outputs.
Output modes
There are three analogue output channels which can be configured as either voltage (0 to
5v, or ±2.5v), or current outputs (4 to 20mA). They are available simultaneously with the
digital outputs.
Channel outputs
The signals on the Channel outputs 1 and 2 are dependant on the Output format chosen.
The signal on Channel 3 can be configured for either Status or Temperature.
Output format Channel 1 Channel 2 Channel 3
UV (M1, M3, or M7) U V
Polar (M2, M4, or M8) Magnitude Direction
NMEA (M5) Magnitude Direction
Tunnel (M6) U Speed U direction
Status or Temperature
Tunnel (M12) U Speed U Direction
Tunnel (M13) U Speed U Direction
Status
If channel 3 is configured for Status, the output will be 0v (or 4mA) if the unit is in an OK
condition. In a fault condition, error code 01, 02, or 04, the output will be +5v (or 0mA).
See Section 10.5 for the list of Error Codes.
Temperature
If channel 3 is configured for Temperature, it reports the temperature if it is between –40
and +70°C, scaled from +0.7V to +5V (6.25mA to 20mA). Temperatures outside this
range are reported as errors by setting the output to 0V (4mA).
Tunnel mode
In Tunnel mode, Channel 1 represents the Wind Speed along the U Axis, Channel 2 gives
the direction of the wind along the U axis, where a –U vector (=wind from the ‘N’
direction) is represented by 0v (or 4mA), and a +U vector (=wind from the ‘S’ direction)
by 5v (or 20mA).
Scaling
All analogue outputs are in m/s irrespective of the digital units of measurement setting and
can be scaled to have a full-scale deflection of ±10 to ±70 units using the Z command.
In Polar mode the ± sign should be ignored. Only the + sign is effective.
In all cases zero Wind Speed is represented by 0V or 4mA.
Averaging
Analogue Outputs are not averaged when using the G command.

Gill Instruments WindObserver II Specifications

General

Brand	Gill Instruments
Model	WindObserver II
Category	Measuring Instruments
Language	English