Vaisala WXT536 - Analog Output Scaling

User’s Guide ______________________________________________________________________
158 _________________________________________________________________ M211840EN-C
Example commands to set 4 ... 20 mA operation:
The output o in mA is o=i* gain + offset. o is clamped between min and
max. If wind measurement fails, the output value is err.
Analog Output Scaling
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 table below.
Wind Speed Gain aSU,a=0.333333<cr><lf>
Wind Speed Offset aSU,b=4 <cr><lf>
Wind Speed minimum aSU,c=0<cr><lf>
Wind Speed maximum aSU,d=22<cr><lf>
WS error indication aSU,e=2<cr><lf>
Wind Direction Gain aSU,f=0.044444<cr><lf>
Wind Direction Offset aSU,g=4<cr><lf>
WD minimum aSU,h=0<cr><lf>
WD maximum aSU,j=22<cr><lf>
WD error indication aSU,k=2<cr><lf>
Table 24 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>