V 6.7.8 (2023-08-28) - Bugfix related to SDI-12 communication V 6.6.9 ... V 6.7.7 - Internal versions; not published V 6.6.8 (2023-02-09) - Measurement of low velocities optimized - Signal processing optimized V 6.3.0 ... V 6.6.7 - Internal versions; not published V 6.2.9 (2021-03-03) - Bugfix related to SDI-12 communication: an OTT SVR 100 on an SDI-12 bus now responds exclusively to SDI-12 commands explicitly addressed to its SDI-12 sensor address. - A new SDI command (aOSA+x!) has been added. This command deactivates the internal tilt angle sensor and sets the tilt angle to a fixed value. It is intended as a special application exclusively for calibration/measurement runs in a hydrometric measuring channel! - An additional option has been created to retrieve the complete signal spectrum of the OTT SVR 100 via Modbus. Versions < V 6.2.9 Firmware versions supplied with the OTT SVR 100 from the factory; not intended for update by end users.