WindMaster and WindMaster Pro
1561-PS-0001.
Issue 11 February 2017
________________________________________________________________________________________________________________________
44
9. ANALOGUE OUTPUTS
Notes: Options of four analogue outputs must be specified when ordering.
Use Gill Wind Software to enable Analogue outputs.
Information on how to change the formats and all the settings follows in Section 10, CONFIGURING.
Averaging (G command) does not apply to analogue outputs, these are updated at the unit base rate
(20Hz or 32Hz).
Analogue outputs are always in Metres/Second irrespective of the digital output units setting.
If the M command is changed after setting up analogue outputs then note that Analogue settings may
need to be re-configured for the new M setting.
9.1.
Output allocations
Each of the outputs can be configured to one of the following;-
U, V, W, Polar Angle (Horizontal Direction), Speed of Sound, Sonic Temperature, Status, Polar magnitude
(Horizontal Wind Speed).
9.2.
Output types
They are user-configurable as:-
Voltage 0V to 5V,
or -2.5V to +2.5V,
or –5V to +5V,
Current 4 -20 mA,
or 0 - 20mA.
9.3.
Voltage outputs
The output impedance is less than 1 ohm. To prevent inaccuracies, the outputs should be connected to an input with an
impedance greater than 10K
Ω.
9.4.
Current outputs
Important
When using the current outputs, the load resistance between the Output and Ground
must be <= 300 ohms, including cable resistance.
This is to ensure that the voltage levels on the Analogue outputs
do not exceed 5V.
9.5.
Scaling (metres/second only)
This is user-configurable to 5, 10, 20, 30, 40, 50, 60, or 120 m/s full scale for wind speed.
Using 50m/s and UVW setting as an example, this defines the outputs range as follows
Polar setting will range between 0 – 50m/s.
Output
Voltage
0 to 5V
Voltage
2.5V
Voltage
5V
Current
4 - 20 mA
Current
0 - 20 mA
U, V, W
-50 m/s
0
-2.5
-5
4
0
0 m/s
+2.5
0
0
12
10
+50 m/s
+5
+2.5
+5
20
20