Operating Manual V25/09.2019
Ventus / Ventus-X / V200A
Chapter 20 Appendix 55
20.6 Communication in SDI-12 Mode
The communication in the SDI-12 mode of the WSxxx is conforming to the standard defined in
‚SDI-12 A Serial-Digital Interface Standard for Microprocessor-Based Sensors Version 1.3
January 12, 2009‘ . The station may be operated in bus mode together with other SDI-12
sensors, connected to one SDI master (logger).
20.6.1 Preconditions for SDI-12 Operation
As the interface settings defined in the SDI-12 standard are significantly different from the UMB
default settings, some preconditions have to be met for operation:
Hardware version equal or higher 3.0
Software version equal or higher 1.5
Jumper for activation of SDI-12 mode has to be wired (see below)
Setting for SDI-12 mode in the configuration (via Config Tool)
To activate the SDI-12 mode a jumper is to be wired between control input and analog ground
(pins 3 and 6 of the of the UMB round connector, or red and blue wires of the connection
cable).
Using the Config Tool the operation mode of the station has to be set to “SDI-12”, parity to 7E1
and the baudrate to 1200Bd.The serial interface must be operated in half duplex mode
Figure 18: Setting the SDI-12 protocol
Measurement data can be transmitted alternatively in metric or US units. The selection is done
by the UMB Config Tool.
Figure 19: Setting the unit
When operating the device in SDI-12 mode it is basically no longer possible to access the
device with the UMB Config Tool, due to the different interface parameter settings. To enable
configuration access nevertheless the interface is operated in standard UMB mode for the first 5
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