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Issue: 8 (Applies to firmware 2387 6.09 onwards)
Document number: 1390-PS-0039
1. Continuous Output: In this mode the unit continuously outputs a burst of RS422 level data (the frequency
determined by the output rate setting). After the burst of data and until the next data burst the data lines revert to a
high impedance state.
2. Polled Output: In this mode the data lines are in a high impedance state until the unit is polled for data. Upon receipt
of a poll command the unit outputs a burst of data at RS485 levels and then reverts to a high impedance state until
the next poll command receipt.
Low wind speeds
Whilst the wind speed is below 0.05 metres/sec, the wind direction will not be calculated, and the last known good
direction figure is shown. All other output parameters will continue to update at the output rate
5.3. Units
The wind speed can be set to any of the following units:
Knots knots
5.4. Output rate
The output frequency can be set between 1 and 10 per second. The wind speed is sampled every 25ms, each axis being
sampled sequentially. The following Table lists the possible outputs per second and the corresponding number of
averaged samples. A 25ms sample period is used to process and output the results.
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