This article needs additional citations for. Unsourced material may be challenged and removed.Find sources: – ( November 2014) SDI-12 (Serial Digital Interface at 1200 baud) is an asynchronous serial communications protocol for intelligent sensors that monitor environment data. These instruments are typically low-power (12 volts), are used at remote locations, and usually communicate with a data logger or other data acquisition device.
The protocol follows a master-slave configuration whereby a data logger (SDI-12 recorder) requests data from the intelligent sensors (SDI-12 sensors), each identified with a unique address. Contents.History The first version of SDI-12 was released in 1988. It was designed by a coalition which included the U.S. Geological Survey's Hydrologic Instrumentation Facility (HIF) and a group of private companies.The SDI-12 Specification is maintained by a non-profit corporation called the SDI-12 Support Group.
The most recent upgrade (Version 1.4) was made in May, 2017. Scope Version 1.4 of SDI-12 defines:. High volume commands (aHA!
For ASCII and aHB!