Decagon Devices GS3 User Manual

GS3 Integrator Guide R34
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7
COMMON SDI-12 COMMANDS
Below is a list of common SDI-12 commands that are often used in an SDI-12 system and the
corresponding responses from our sensors:
INFO COMMAND (aI!)
The information command can be used to obtain a variety of detailed information about the sensor you are
connected to. Here is an example output from one of our sensors (the logger command is in bold):
1I!113DECAGON GS3 337631800001
PARAMETER
FIXED LENGTH
*
DESCRIPTION
1I!
3 Chars
Request from the data logger asking for information from sensor
address 1.
1
1 Char
Sensor Address. Pre-pended on all responses, this allows you to know
which sensor on your bus is returning the following information.
13
2 Chars
Indicates that the target sensor supports SDI-12 Specification v1.3
DECAGON
8 Chars
The Vendor Identification String. The parameter is the same for all
our Decagon sensors.
GS3
6 Chars
The Sensor Model String. This string is specific to the sensor type. For
GS3 Sensors, the string is “GS3”
337
3 Chars
The Sensor Version. This number is divided by 100 to give our sensor
version. In this case the Decagon sensor version is 3.37
631800001
Up to 13 Chars
The Sensor Serial Number. This is a variable length field. For older
sensors this may be omitted. Newer sensors may contain serial
number information here.
* In the event that the fixed length is longer than the parameter, the trailing characters will be populated with space characters.
MEASUREMENT COMMAND
†
(aM!)
The measurement command can be used to begin a sensor measurement. Here is an example output
from one of our sensors (the logger command is in bold):
1M!10013
PARAMETER
FIXED LENGTH
DESCRIPTION
1M!
3 Chars
Request from the data logger asking the sensor with address 1 to
begin a measurement
1
1 Char
Sensor Address. Pre-pended on all responses, this allows you to know
which sensor on your bus is returning the following information.
001
3 Chars
The measurement data will be available after this specified time in
seconds. If a sensor finishes early, it will initiate a service request
(SDI-12 address and a return character line feed).
3
1 Char
Number of values that will be returned.
†
The measurement and corresponding data command are intended to be used back to back. If you would like to start a measurement on
more than one sensor at a time, you must use the concurrent command. See the SDI-12 Specifications v1.3 document for more information.

Decagon Devices GS3 Specifications

General

Brand	Decagon Devices
Model	GS3
Category	Accessories
Language	English