Operating Manual

IRS31Pro-UMB Operating Manual V10 / 01.2020
G. Lufft Mess- und Regeltechnik GmbH 59
18.5.7 Message Change of Unit System
The command is used to change the unit system used for the SDI12 data between metric and US units. It
is implemented as manufacturer specific X command.
Command: aXU<u/m>!
Response: aXU<u/m><CR><LF>
u : US units
m: metric units
Example: change to metric units, SDI-12 address ‘0’
0XUm!
0XUm<CR><LF>
18.5.8 Message Selection of Spot or Average Value
The command is used to select average or spot value for transmission. It is implemented as manufacturer
specific X command.
Command: aXA<a/c>!
Response: aXA<a/c><CR><LF>
a : average
c: spot
Example: change to average values
0XAa!
0XAa<CR><LF>
18.5.9 Message: Setting of the Threshold for Road Condition “Moist”
The command sets the threshold of water film height, above which the road condition is set to “moist”.
Command: aXM+nnn!
nnn: water film height threshold in µm
Response: aXM+nnn<CR><LF>
The response to the attempt of setting of an invalid value is
aXMf<CR><LF>
Example: The threshold is set to 20 µm
0XM+20!
0XM+20<CR><LF>
18.5.10 Message: Setting of the Threshold for Road Condition “Wet”
The command sets the threshold of water film height, above which the road condition is set to “wet”.
Command: aXW+nnn!
nnn: water film height threshold in µm
Response: aXW+nnn<CR><LF>
The response to the attempt of setting of an invalid value is
aXWf<CR><LF>
Example: The threshold is set to 220 µm
0XW+220!
0XW+220<CR><LF>