In-Situ Aqua TROLL 400 Modbus and SDI-12 Reference Guide - Manual (Page 17)

2.4 Extended Commands
The Multi-PRO 400 Instrument supports the following extended SDI-12 commands.
Name Command Response
Set Factory Defaults
Send Data
aXFD!
aD0!
a0011<CR><LF>
One result is available in 1 second for reading by
the Send Data command. Restores all settings and
calibration values to their factory defaults.
a+s<CR><LF>
s = command status, 1 = command successful, 0 =
command failed.
Set Output Sequence
aXOnnn!
aOK<CR><LF> or
aERROR<CR><LF>
nnn = 1 to 15 parameter characters in the desired
output order. The default sequence is oTsCLHr.
o = Dissolved Oxygen Concentration
T = Temperature
s = Dissolved Oxygen Saturation
p = Partial Pressure of Oxygen
A = Actual Conductivity
C = Specific Conductivity
S = Salinity
D = Total Dissolved Solids
R = Resistivity
d = Density of Water
P = Pressure
L = Level
H = pH
h = pH mV
r = ORP
Read Output Sequence
aXO! annn<CR><LF>
nnn = 1 to 15 parameter characters as described
for the XO command.
Set DO Concentration Units
aXoUnnn!
aOK<CR><LF> or
aERROR<CR><LF>
nnn = the DO concentration units ID
Three digits are required.
Read DO Concentration
Units
aXoU! annn<CR><LF>
nnn = DO concentration units ID
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