Analog output scaling - WXT530

You can specify the transfer function between measured values and output analog values. You can select the analog output gain and offset used in the transfer function.

The factory default settings for the different analog output modes are displayed in the following table.

Table 1. Analog output scaling

Parameter	4 … 20 mA option (max. 60 m/s)	0 … 20 mA option (max. 60 m/s)	Command example (4 … 20 mA)
Aout1, wind speed gain	0.266667 mA / m/s	0.333333 mA / m/s	aSU,a=0.266667<cr><lf>
Aout1, wind speed offset	4 mA	0 mA	aSU,b=4<cr><lf>
Aout1, wind speed minimum	0 mA	0 mA	aSU,c=0<cr><lf>
Aout1, wind speed maximum	22 mA	22 mA	aSU,d=22<cr><lf>
Aout1, wind speed error indication	2 mA	22 mA	aSU,e=2<cr><lf>
Aout2, wind direction gain	0.044444 mA / °	0.055556 mA / °	aSU,f=0.044444<cr><lf>
Aout2, wind direction offset	4 mA	0 mA	aSU,g=4<cr><lf>
Aout2, wind direction minimum	0 mA	0 mA	aSU,h=0<cr><lf>
Aout2, wind direction maximum	22 mA	22 mA	aSU,j=22<cr><lf>
Aout2, wind direction error indication	2 mA	22 mA	aSU,k=2<cr><lf>

You can configure output scaling or transfer function settings by changing the custom gain and offset. The basic measurement units are m/s and degrees. The physical output unit is A. The following formula shows the impact of gain and offset values on the produced output:

$o=y0+k\times s$

o	Produced analog output (A)
s	Measured wind speed or wind direction (in m/s or °)
k	Selected gain value
y0	Selected offset value