Gill WindObserver 65 - Page 27

27
gillinstruments.com
Issue: 8 (Applies to firmware 2387 6.09 onwards)
Document number: 1390-PS-0039
Ultrasonic Anemometer
RWA Default settings are: -
P (Output rate Hz) = 1
RWASHORT = 60
RWALONG = 10
Therefore:
Anemometer output period = 60/1 = 60 seconds (the WindObserver will output a reading every 60 seconds).
Averaged direction and magnitude reading = 10 x 60 = 600 seconds
(This is the time the readings will be averaged over).
When the average building period has been completed, the average reported thereafter will be a rolling average derived
from the last averaged direction and magnitude time period.
Mode 15 – Averaging Data in Continuous mode.
Averaged Digital Data Output comprises of.
<Start of String> , Unit Identifier, Mode, Averaged Direction, Averaged Magnitude, units, Maximum Gust Direction,
Maximum Gust Magnitude, Status, , checksum.
e.g.
(status code 51 shows measurement average building, non-heat enabled units only).
(status code 00 code shows measurement average building period complete and normal operation, non-heat enabled
units only).
Principle set up commands associated with this averaging mode are: -
Px:- Measurement Rate, (P1) this command sets the underlying measurement rate 1Hz.
RWASHORT xx: - Short Term Number, where xx is a number from 10 to 60.
RWALONG xx: - Long Term Number, where xx is a number from 1 to 10.
Therefore, with the RWASHORT number set for 60 (default) and P command set for 1Hz (P1 default) the unit will output a
rolling averaged reading every 60 seconds.
The Averaged Data Output period in seconds is: -
RWASHORT Number
Measurement Rate (P Setting Hz value)
Therefore, with the RWASHORT number set for 60 (default) and P command set for 1Hz (P1 default) the unit will output a
rolling averaged reading every 60 seconds.
The Averaged Direction and Magnitude reading is based on: - RWALONG Number * Averaged Data Output period.