Users Manual

Operating Manual Smart Weather Sensor
90 G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
Figure 43: Sensor
Configuration SDI-12
Figure 44: Sensor
Configuration SDI-12
Units
19.6 Communication in SDI-12 Mode
The communication in the SDI-12 mode of the Smart Weather Sensor is conforming to the
standard defined in ‚SDI-12 A Serial-Digital Interface Standard for Microprocessor-Based
Sensors Version 1.3 January 12, 2009‘ . WS100-UMB also supports SDI-12 Version 1.4
beginning from firmware version v2.4. The device may be operated in bus mode together
with other SDI-12 sensors, connected to one SDI master (logger).
19.6.1 Preconditions for SDI-12 Operation
As the interface settings defined in the SDI-12 standard are significantly different from the
UMB default settings the related parameters have to be set properly by the UMB-
ConfigTool.NET (latest version!).
The protocol mode of the device has to be set to “SDI-12”, baudrate to 1200Bd and (for
WS100 only) parity to 7E1.
Measurement data can be transmitted alternatively in metric or US units. The selection is
done by the UMB Config Tool.
Metric units, US units
Note: Please observe drawings on next page and notes on page 30 when connecting a
SDI12 data logger!