Sutron Corporation RLR-0003-1 Manuel D’Utilisation
Bringing the Benefits of Real-Time Data Collection to the World
28
SDI-12 Sensor Operation
The radar can function as an SDI-12 Sensor. This allows the radar to connect to another data logger or
transmitter to provide the data when requested. If you are not using the radar with another data recorder or
transmitter, you can skip this section.
For details on
transmitter to provide the data when requested. If you are not using the radar with another data recorder or
transmitter, you can skip this section.
For details on
The most common SDI-12 command used with the radar is the “M” measure command followed by the “D0”
command. The “M” command requests the radar to make a measurement and the “D0” command gets the
data. While there are a lot of other commands available, most users will simply use the M, D0 commands.
Note: The radar „Mode‟ of operation, ie Normal vs. Continuous Mode, will have an impact on the
communication delays experienced with the SDI-12 operation. See section
on operation.
The remainder of this section documents all the SDI-12 commands supported by the radar. Note that most
any setting that can be changed from the front panel, can also be changed via SDI-12.
Changing the SDI-12 address can be accomplished via the front panel (
The remainder of this section documents all the SDI-12 commands supported by the radar. Note that most
any setting that can be changed from the front panel, can also be changed via SDI-12.
Changing the SDI-12 address can be accomplished via the front panel (
SDI-12 Reference
The radar will respond to all standard SDI-12 commands. To use the SDI-12 commands you must have a
data logger or interface that supports the SDI-12 standard. The radar is compliant with SDI-12 Specifications
version 1.3. More details on the SDI-12 interface can be found at
data logger or interface that supports the SDI-12 standard. The radar is compliant with SDI-12 Specifications
version 1.3. More details on the SDI-12 interface can be found at
The general form of an SDI-12 command is:
aC!<CR><LF>
where a is the sensor address 0-9,A-Z,a-z,*, ?. (Addresses * and ? will address any sensor, regardless
of its address.)
C is the command and ! is the last character of the command.
The standard SDI commands are as follows
Name
Command(s)
Response
Example/Notes
Acknowledge Active
a!
a
I
Send Identification
aI!
A13 SUTRON 1.0
RLRXXXV1.21
Where 1.0 is the board
revision, V1.21 is the
software revision
RLRXXXV1.21
Where 1.0 is the board
revision, V1.21 is the
software revision
A
Change Address
aAb!
b
?
Address Query
?!
a
M
MC
C
CC
MC
C
CC
and
aM!
aD0!
aD0!
atttn
a
+stage
+discharge
+units
+distance
+validity
a
+stage
+discharge
+units
+distance
+validity
Returns stage in user set
units, discharge (0 if
disabled), units
indicator, and validity.
The validity can be 0-
valid, 1-sensor failure,
2-data old, 3-system not
configured properly
units, discharge (0 if
disabled), units
indicator, and validity.
The validity can be 0-
valid, 1-sensor failure,
2-data old, 3-system not
configured properly