Campbell Scientific Sentek EnviroSCAN EasyAG SDI-12 Manual v 3.4 - Manual (Page 6)

EnviroSMART & EasyAG SDI-12 Probe Manual
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The EnviroSMART® and EasyAG® SDI-12 Probe Interface
About the SDI-12 probe interface
This section provides information about the EnviroSMART and EasyAG SDI-12 probe interfaces.
What is SDI-12?
SDI-12 (Serial Digital Interface at 1200 baud) is a standard communication protocol, allowing
connection of multiple sensors to an SDI-12 compatible data logger. SDI-12 communicates using a
cable containing three(3) conductors:
⇒ a serial communication line
⇒ a ground line
⇒ a 12V line
The EnviroSMART and EasyAG SDI-12 probe interfaces support commands from version 1.2 of the
SDI-12 communication protocol. For more information on SDI-12, visit www.sdi-12.org.
What are the EnviroSMART® and EasyAG® SDI-12 probe interfaces?
The EnviroSMART and EasyAG SDI-12 probe interfaces are used to allow an SDI-12 compatible
device to communicate with and retrieve data from multiple Sentek sensors installed on a single probe.
Both EnviroSMART and EasyAG SDI-12 probe interfaces behave as a slave device, meaning they are
not capable of logging information or sampling data themselves. The interface must be attached to an
SDI-12 compatible device acting as a master device, which will issue SDI-12 commands to instruct the
probe interface what to do. When instructed to sample data, the SDI-12 probe interface will retrieve
values from each sensor configured on the probe. These values are returned to the master device for
storage.
The probe and its sensors are configured using the Intelligent Probe Configuration Utility (see section
What is the intelligent Probe Configuration Utility?).