OTT PLS - Advanced SDI-12 Commands; Setting Level;Pressure Units; Setting Temperature Units

More information on the SDI-12 standard commands can be found in the document "SDI-12; A Serial-Digital Interface Stan-
dard for Microprocessor-Based Sensors, Version 1.3" (see Internet page "www.sdi-12.org").
6.2 Advanced SDI-12 commands
All advanced SDI-12 commands begin with an "
O" for OTT. With these commands, it is possible to configure the OTT PLS
using the transparent mode of a datalogger.
Command Response Description
aD0! a<value><CR><LF>
Send data (after aV!)
a – Sensor address
<value> – Result of the system test
+0 = no hardware defect found
+128 = flash memory defective
+256 = Watchdog error
+512 = memory defective
+1024 = pressure cell defective
+2048 = D/A converter defective
Command Response Description
䊳
Setting/reading the level/pressure measurement values
aOSU<value>!
aOSU!
a<value><CR><LF>
a<value><CR><LF>
Set unit
Read out unit
a – Sensor address
<value> – Units for level
+0 = m; factory setting
+1 = cm
+2 = ft
The level measurement is carried out with com-
pensation for water density, water temperature
and local gravitational acceleration.
Units for pressure measurement
+3 = mbar
+4 = psi
Pressure measurement is carried out without
compensation!
Caution
If settings for the parameters "Offset", "Reference value",
"Upper limit" or "Lower limit" have been made before
changing the unit, they must be reset! There is no automatic
conversion of the parameters set!
䊳
Setting/reading the temperature value units
aOST<value>!
aOST!
a<value><CR><LF>
a<value><CR><LF>
Set unit
Read out unit
a – Sensor address
<value> – +0 = °C; factory setting
+1 = °F
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