SDI-12

Environmental solutions

ABOUT SDI-12

SDI-12 stands for “Serial Data Interface at 1200 baud” and is a common protocol for interconnection of environmental sensors and dataloggers. The SDI12 standard has been developed and maintained by the SDI12 support group which is accessible at www.sdi-12.org. The SDI12 standard is a powerful protocol for connecting sensors offering a lot of advantages over analog measurements or other standardized or proprietary serial protocols.

Simple 3 wire interface
Simple 3 wire interface
Measurement Science maintain this web page to provide:
  • Detailed technical reference and support material for people wanting to learn more about the protocol, to add to the efforts of the SDI-12 Support Group
  • Resources relating to SDI12 based products that we have developed to suit environmental applications
Simple Interface
3 wires, 1200 baud
Addressable
Master-slave multi-sensor bus
Lightweight
Plain text data, ie: 0+11.6+0.003+18.7+4710
Reliable
Includes CRC error checking
ADVANTAGES

ADVANTAGES OF SDI-12 OVER OTHER METHODS

Click the links below for further information

Alternatives
Comparison to NMEA, Modbus & proprietary protocols
Identify
Identify the sensor through commands
Conversion
Converting SDI12 to something else, and vice-versa
SENSORS
LaserLEVEL
LaserLEVEL
Non-contact, long-range level measurement

BaroP
BaroP
SDI12 Barometric pressure sensor with wave statistics processing for floating platforms

(coming soon)
StormSENSE
StormSENSE
Early warning storm detector

(coming soon)
DISPLAYS
PanelMETER
PanelMETER
Panel meter to display data on any sensor, or existing SDI12 bus

(coming soon)
SUPPORT
It's our opinion that the SDI12 protocol is the most powerful method for reading environmental sensors. Visit the product pages for more information and downloadable resources. If you have a difficult application, challenge us. To talk to a local distributor, contact us here. Expect an answer within 2 business days.