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OTT HydroMet Fellbach GmbH, Firmware releases WS200 - WS800 sensors

Firmware WSx-Release v72, 13 January 2026

1. Option to keep the last wind direction if wind speed below minimum
2. Wind speed is also output when in overrange (wind speed max + 5m/s)

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Firmware WSx-Release v70, 17 February 2023
1. Bugfix: I2C Driver fix to avoid read problems (timing)from EEPROM
2. Feature add: fan monitoring feature added, available since hardware release 32 

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Firmware WSx-Rerlease v69, 23 August 2022

1. Feature add: Deactivation automatic hardware-switch  for SDI12. SDI-12 protocol communication is available now in standard RS485 mode
2. Feature add: SDI12 Command aXVd! added to poll for device revision number

English / Deutsch

SHM31 Firmware
(c) 02/2025, OTT HydroMet Fellbach GmbH, Gutenbergstraße 20, 70736 Fellbach, Germany
[email protected]

Version 2.2 (2025-02-05)
- watchdog added to all tasks
- channel for watchdog reset reason added
- fix for system runtime
- fix in watchdog initialization
- fix in ASCII2 SS1-SS5
- fix in ASCII2 error representation
- partial support for HW8
- reading of accelerometer values improved

Version 2.1 (2023-07-21)
- removed unused watchdog trigger
- added UMB channel Reset-Counter
- minor modifications of the new standard telegrams SS;2 bis SS;6

Version 2.0 (2023-06-22, not published)
- ASCII2 IFO;16 over RS232 with high number of channels caused permanent failure of RS232 communication
- UMB Channel request: a few channels responded with an incorrect Info field
- ASCII2 DSC: Input of a description with over-length caused permanent communication failure: added length 
  limitation in CommonLib
- ASCII2 DSC: When a long text was written over by a short text, the remains of the
  long text remained visible
- ASCII2 ATI: Setting 0 was accepted and caused blocking of the device on start of
  Autotransmit by data transmission without break. Minimum value of interval internally
  limited to 5s
- ASCII2 UAA: Modification of the parameter through ASCII2 not accepted (error 15). 
- ASCII2: Addressing von E2 memory storage point corrected, added EE_BEGIN_CONF . OK

New funktionality:
- New standard telegrams SS;2 bis SS;6 on customer request, predefinded for different units (m, cm, mm, inch). 
  Including constant number of digits and decimal point location: Use of the Scaling Factor no longer
  required

Version 1.9 (2022-05-19)
  - solved frequent E21 and E22 errors
  - solved error in Modbus holding register 16

Version 1.8 (2020-05-15 14:12:16 GIT_366)
NOT PUBLISHED
  - solved frequent E22 error (timeout Laserkommunikation) by short term command repeat on timeout
   (up to now only detected at end of laser interval).
  - Update to current CommonLib version, migration to IAR 4.11.1
  - Tickcounter Overflow handling for OS_GetTime funktions
  - Extended Device Info

Version 1.7 (2018-17-10 16:09:13 @688)
  - UMB-ASCII 2.0: Output format of telegram 1 reset to original format
    of version 1.4.

Version 1.6 (2018-12-10 15:00:32 @685) not published
  - Signal strength threshold value for Snow flag adjustable
  - Limit values for heating temperature hysteresis corrected (no
    negative hysteresis)
  - Improvement of the laser control (no getting stuck with laser on/off
    and reference value determination.)
  - SDI12 adaptation to SDI12v1.4
  - Improvement of the behaviour at high temperatures (suppression of
    signal strength display, switch-off of laser and heating)
  - Monitoring of the block temperature sensor for short circuit and
    breakage supplemented, switch-off of the laser in case of failure
  - Correction for treatment with max. snow depth difference exceeding
  - Laser cycles introduced for lifetime monitoring (debug UMB channel
    21050, for service only)

Version 1.5  (2018-08-09 @631) not published
  - Modbus integration and configuration
  - Internal software conversion (CommonLib), ASCII telegrams are no
    longer sent synchronously to the calculation.

Version 1.4  (2017-05-18 10:41:13 @325)
  - UMB-ASCII 2.0: Output formats of telegram 1 corrected
    (correct output for snow depth less than 1)

Version 1.3  (2017-05-11 13:01:09 @323)
  - UMB-ASCII 2.0:
    - Output formate of telegram 1 changed
      (snow depth 8 characters, short serial number, angle without sign
      4 characters)
      If the values do not fit into the specified format, the decimal
      places are omitted before the format length changes.
    - IFO-Befehl:
      - IFO;15      return correct values
      - IFO;16;<bl> activated (block size 30, 4 blocks {0,1,2,3} available)

  - Parameter:
    - Value ranges changed: scaling_factor [0, 40000] and
      maximum_snowheight_difference [-20000, 20000]

Version 1.2  (2017-05-11 13:01:09 @314)
  - start version

__________________________________________________________

SHM31 Firmware
(c) 08/2023, OTT HydroMet Fellbach GmbH, Gutenbergstraße 20, 70736 Fellbach, Germany
[email protected]

Version 2.2 (2025-02-05)
- Watchdog zu allen Tasks hinzugefügt
- Kanal für Watchdog Reset Reason hinzugefügt
- Fix für Systemlaufzeit
- Fix in Watchdog Initialisierung
- Fix in ASCII2 SS1-SS5
- Fix in ASCII2 Fehlerwert Anzeige
- Partieller Support für HW8
- Auslesen der Accelerometer Werte verbessert

Version 2.1 (2023-07-21
- nicht verwendete Watchdog-Trigger entfernt
- UMB-Kanal Reset-Counter ergänzt
- Kleine Änderungen an den neuen Standard-Telegrammen SS;2 bis SS;6

Version 2.0 (2023-06-22  - Release nicht veröffentlicht)
Bug fixes:
- Ascii2 IFO;16 über RS232 bei höherer Kanal-Anzahl führte zum Ausfall der RS232-Kommunikation
- UMB Kanalabfrage: bei einigen Kanälen fehlerhaftes Info-Feld in der Antwort
- Ascii2 DSC: Eingabe von Bezeichnung mit Überlänge führte zu dauerhaftem Ausfall der Kommunikation:
Längenbegrenzung in CommonLib ergänzt
- Ascii2 DSC: Beim Überschreiben eines langen Textes durch einen kürzeren blieb der Rest des vorherigen Tests sichtbar
- Ascii2 ATI: Einstellung 0 über ASCII2 wurde akzeptiert und führte beim Start des Autotransmit zur Blockierung des Geräts durch Datenübertragung ohne Unterbrechung: akzeptierter Minimalwert auf 5s geändert
- Ascii2 UAA: Änderung des Parameters über ASCII2 wird nicht akzeptiert (error 15). 
- Ascii2: Adressierung von E2-Speicherstellen korrigiert, EE_BEGIN_CONF ergänzt: OK

Neue Funktionalität:
- Neue Standardtelegramme SS;2 bis SS;6 nach Kundenanforderung implementiert
- Neue Standardtelegramme für verschiedene Einheiten voreingestellt, inkl. fester Stellenzahl und Position des Dezimaltrennzeichens, Darstellung in m, cm, mm und inch. Die Verwendung des Skalierungsfaktors wird nicht mehr benötigt.

Version 1.9 (2022-05-19)
  - Häufiges Auftreten der Fehler E21 und E22 beseitigt
  - Fehler bei Modbus Holding Register 16 behoben

Version 1.8 (2020-05-15 14:12:16 GIT_366)
NICHT VERÖFFENTLICHT
  - häufiges Auftreten des Fehlers E22 (timeout Laserkommunikation) beseitigt durch kurzfristige
    Wiederholung des Befehls bei timeout (bisher erst nach Ablauf des Laserintervalls erkannt).
  - Update auf aktuelle CommonLib, Migration auf IAR 4.11.1
  - Tickcounter Overflow handling für OS_GetTime Funktionen
  - Extended Device Info

Version 1.7 (2018-17-10 16:09:13 @688)
  - UMB-ASCII 2.0:  Ausgabeformat von Telegramm 1 wieder auf original Format
    von Version 1.4 gesetzt.

Version 1.6 (2018-12-10 15:00:32 @685)  nicht veröffentlicht
  - Signalstärken-Schwellwert für Snow-Flag einstellbar
  - Grenzwerte für Heizungstemperatur-Hysterese korrigiert (keine
    negative Hysterese)
  - Verbesserung der Lasersteuerung (Kein Hängenbleiben bei Laser
    an-/ausschalten und Referenzwertbestimmung.)
  - SDI12-Anpassung auf SDI12v1.4
    - Verbesserung des Verhaltens bei hohen Temperaturen
      (Unterdrückung der Signalstärkenanzeige, Abschaltung von Laser und Heizung)
    - Überwachung des Block-Temperatursensors auf Kurzschluss und Bruch
      ergänzt, Abschaltung des Lasers bei Ausfall
  - Korrektur zur Behandlung bei max. Schneehöhendifferenz-Überschreitung
  - Laserzyklen für Lebensdauer-Überwachung eingeführt (Debug-UMB-Kanal
    21050, nur für Service)

Version 1.5  (2018-08-09 @631) nicht veröffentlicht
  - Modbus-Integration und -Konfiguration
  - Interne Softwareumstellung (CommonLib), ASCII-Telegramm werden nicht mehr
    synchron zur Berechnung gesendet.

Version 1.4  (2017-05-18 10:41:13 @325)
  - UMB-ASCII 2.0: Ausgabeformate von Telegramm 1 korrigiert
    (Schneehoehe fuer Werte kleiner 1 wird korrekt ausgegeben.)

Version 1.3  (2017-05-11 13:01:09 @323)
  - UMB-ASCII 2.0:
    - Ausgabeformate von Telegramm 1 korrigiert
      (Schneehoehe 8 Zeichen, kurze Seriennummer, Winkel ohne Vorzeichen
      4 Zeichen)
      Wenn Werte groesser sind als vorgegebenes Format, werden erst
      die Nachkommestellen weggelassen, bevor sich die Laenge des
      Formates aendert.
    - IFO-Befehl:
      - IFO;15      liefert korrekte Werte
      - IFO;16;<bl> aktiviert (Blockgroesse 30, 4 Bloecke {0,1,2,3})

  - Parameter:
      - Wertebereiche angepasst: scaling_factor [0, 40000] und
        maximal_snowheight_difference [-20000, 20000]

Version 1.2  (2017-05-11 13:01:09 @314)
  - Startversion

New Firmware V29:

• Pyrometer: Interference suppression improved
• Internal parameter adjusted after hardware redesign (v28/ v29)
• ASCII Protocol: Answer time enlarged from 50ms to 500ms

Change overview for CHM firmware version 1.150

Changes for CHM15k and CHM8k:
- Additional variant of the cloud detection algorithm to improve cloud detection in precipitation ("modified clouds in precipitation" (mcp)) implemented.
  Activation via Bit 1 in the "CloudDetectionMode" parameter, i.e., for values 2, 3, 6, and 7.
- Access to AFD log files via the web interface ("Download AFD log files" in the "Config Network" tab as "SuperUser").
- AFD file transfer via SFTP with SSH key authentication:
  - Automatic generation of an SSH key pair on each device.
  - Retrieval of public SSH keys via the web interface ("Download ssh keys" in the "Config Network" tab as "SuperUser").
  - Usage note:
    - Public key must be stored on the server.
    - Specify key file in DIR_CONFIG (afdsettings.txt) instead of the password: <i>/home/.ssh/id_ecdsa (escape special characters with \).
      Example: sftp://user;fingerprint=3f-ae-37-a4-ba-11-07-5f-01-18-ad-28-c5-b8-13-52:\<i\>\/home\/.ssh\/[email protected]/chm/%h
- Optimized response to "CloudDetectionMode" changes. Seamless aerosol layer height (pbl) calculation if Jet-Filter bit remains unchanged.
- Tooltip for "CloudDetectionMode" adjusted.
- Bug fixes:
  - Access to the web interface after device start with "StandbyMode" set.
  - Fixed sporadic, unexplained firmware restarts.
  - Revised "NTP Status (ntpq)" output in the web interface and ntpq error messages.
  - Cleaned home partition.

Changes for CHM15k:
 - Jet-Filter" variant of the cloud detection algorithm enabled for CHM15k devices (labelled as experimental). Activatable by Bit 2 in "CloudDetectionMode".

Changes for CHM8k:
 - Baseline correction" (blc) algorithm variant now controlled by Bit 3 instead of Bit 1 in "CloudDetectionMode". The shift occurs automatically during the firmware update, no manual adjustment needed.
   Note: Do not use this algorithm variant for detectors with serial numbers DET22xxxx and higher.

__________________________________________________________

Änderungsübersicht für CHM-Firmware-Version 1.150

Änderungen für CHM15k und CHM8k:
- Zusätzliche Variante des Wolkenerkennungsalgorithmus zur Verbesserung der Wolkenerkennung im Niederschlag ("modified clouds in precipitation" (mcp)) implementiert.
  Aktivierung durch Bit 1 im Parameter "CloudDetectionMode", also bei  Werten 2, 3, 6 und 7.
- Zugriff auf AFD-Log-Dateien über Weboberfläche möglich ( "Download AFD log files" im Reiter "Config Network" als "SuperUser")
- AFD-Dateiübertragung via SFTP mit Authentifizierung über SSH-Schlüssel:
  - Automatische Erzeugung eines SSH-Schlüsselpaars auf jedem Gerät
  - Abfragen der öffentlichen SSH-Schlüssel über die Weboberfläche ("Download ssh keys" im Reiter "Config Network" als "SuperUser").
  - Hinweis zur Nutzung:
    - Öffentlicher Schlüssel muss im Server hinterlegt werden.
    - Schlüsseldatei in DIR_CONFIG (afdsettings.txt) anstelle des Passwortes angeben: <i>/home/.ssh/id_ecdsa (Sonderzeichen mit '\' maskieren)
      z.B.: sftp://user;fingerprint=3f-ae-37-a4-ba-11-07-5f-01-18-ad-28-c5-b8-13-52:\<i\>\/home\/.ssh\/[email protected]/chm/%h

- Optimierte Reaktion auf "CloudDetectionMode"-Änderungen. Lückenlose Aerosolschichthöhen-Berechnung (pbl), wenn Jet-Filter-Bit unverändert bleibt.

- Tooltip für "CloudDetectionMode" angepasst.
- Bug-Fix:
  - Zugriff auf die Weboberfläche nach einem Gerätestart mit gesetztem "StandbyMode" möglich
  - Ursache für sporadisch auftretendes, grundloses Neustarten der CHM behoben
  - Ausgabe von "NTP Status (ntpq)" in der Weboberfläche und ntpq-Fehlermeldungen überarbeitet
  - Bereinigen der home-Partition

Änderungen für CHM15k:
- "Jet-Filter"-Variante des Wolkenerkennungsalgorithmus für CHM15k-Geräte freigeschaltet. (experimentell)
 Aktivierbar durch Bit 2 im "CloudDetectionMode".

Änderungen für CHM8k:
- Algorithmusvariante "baseline correction" (blc) über Bit 3 statt bisher Bit 1 im "CloudDetectionMode" schaltbar.
  Die Verschiebung erfolgt automatisch beim Firmware-Update, kein manuelles Anpassen nötig.
  Hinweis: Diese Algorithmusvariante sollte ab Detektor-Seriennummer DET22xxxx nicht mehr verwendet werden.
 

V 37 ( 08.08.2022)

• Bug fix: format error of channel parameter response for WMO_GUST_DIR channel, caused by missing WMO_GUST_DIR in advanced_info.c :: add_min_max()
• Manual (updated to v30): corrected transposed digits error in table 20.1, WMP_GUST_DIR line (german version)

V 36 (18.11.2021)

• Selectable handling of wind direction when wind speed below minimum: set 0.0 or hold last value
• Parallel operation of Modbus and analog frequency output enabled.
• Parallel analog output operation permitted except for protocols SDI12, Clipper and fullduplex operation
• Modbus message end detection changed from 3.5char timer to length prediction
• Permit parallel operation of Modbus and analog output (except frequency output)
• Corrected buffer length and send function for Modbus-ASCII (requires 510 chars buffer length)

Please note:
- Firmware for Pluvio²L, Pluvio²S
- This firmware version is not suitable for OTT Pluvio² (former generation of devices)!

V 1.06.0 (27.06.2023)
-

V 1.05.0 (15.07.2022)
- Improved system stability to avoid unnecessary system resets
- Improved SDI-12 communication.
- DWD protocol timestamp bugfix.
- Remove write protection from SDI-12 commands listed in manual
- Various minor bugfixes and firmware optimizations
- Compatible to new Pluvio processor generation (k2, k4 mainboards) that are available since July 2022.

V 1.04.0 (22.06.2021)
- Field separator added when a checksum (CRC) is requested. A separator, e.g. ";" is inserted before the output of the CRC value.
- Improved SDI-12 communication. This release resolves the issue with SDI-12 data gaps.
- Stability of "accu RT-NRT" values improved
- Various minor bugfixes and firmware optimizations
- Pluvio²L: stability of temperature compensation for old mechanic (before autumn 2019) improved

V 1.03.0 (24.05.2018)
- Measured value processing optimized to prevent the registration of erroneous precipitation
- The "Accu total NRT" value is now automatically reset for devices for the DWD at 1000 mm/100 inch (measuring range overflow).
  For all other devices, this value is still 500 mm/50 inch.

V 1.02.2 (18.05.2017)
- Common firmware for precipitation sensors OTT Pluvio² L and OTT Pluvio² S
- Improved temperature compensation up to 10 K/h
- Automatic detection for maintenance activities "Emptying the collecting bucket" and "Adding anti-freeze agent for winter operation" has been optimized
- Impulse factors 0.5 mm and 1.0 mm have been added (now 0.05 mm · 0.1 mm · 0.2 mm · 0.5 mm  · 1.0 mm selectable)
- Various minor bugfixes and firmware optimizations

V 1.00.5 ... V 1.02.1
– Internal versions, not published

V 1.00.4 (14.04.2016)

- Initial version

V1.2.1:

-API update for compatibility with Android 12 and 13

- Cloud parameter calculation reworked

- Fixed crashes on some devices

V1.1.8:

-Support and presets for 8k simulator added

- Support for imperial units added

- Sum of cloud height and depth limited to 15000m

- Sum of cloud height and depth is at least 300m

- Cloud height and depth is at least 100m

- Expert mode is visible setting

- Show LED board temperature

- Checkboxes for freerun mode hidden for customers

V1.1.7:

- Checkboxes for freerun mode added to extended screen

V1.1.6: 

- Fix in firmware update dialog

V1.1.4: 

- Fix in Dialog to enable Bluetooth

V1.1.3:

- Dialog to enable Bluetooth added

V1.1.2: 

- API updates for compatibility with Android 6, 7, 8 and 9

V1.0.5:

- Extensive UI simplified. There are now available only predefined presets the can be selected. It is no longer possible to set a specific value. Hence the expected cloud properties are now specified., including PBL value.

- Some icons corrected and updated

V1.0.0:

- First App-Store release

V0.3.0:

- Firmware info dialog added inside app setting

- Setting to activate/deactive Status-LED removed

V0.2.0:

- Small bugfixes

- Added Pulse-Frequency measurement

- Minimum sum of height and thickness restricted to 300m

V0.1.0:

- First Version

Please note:
- Firmware for Pluvio²L, Pluvio²S
- This firmware version is not suitable for OTT Pluvio² (former generation of devices)!

V 1.05.0 (15.07.2022)
- Improved system stability to avoid unnecessary system resets
- Improved SDI-12 communication.
- DWD protocol timestamp bugfix.
- Remove write protection from SDI-12 commands listed in manual
- Various minor bugfixes and firmware optimizations
- Compatible to new Pluvio processor generation (k2, k4 mainboards) that are available since July 2022.

V 1.04.0 (22.06.2021)
- Field separator added when a checksum (CRC) is requested. A separator, e.g. ";" is inserted before the output of the CRC value.
- Improved SDI-12 communication. This release resolves the issue with SDI-12 data gaps.
- Stability of "accu RT-NRT" values improved
- Various minor bugfixes and firmware optimizations
- Pluvio²L: stability of temperature compensation for old mechanic (before autumn 2019) improved

V 1.03.0 (24.05.2018)
- Measured value processing optimized to prevent the registration of erroneous precipitation
- The "Accu total NRT" value is now automatically reset for devices for the DWD at 1000 mm/100 inch (measuring range overflow).
  For all other devices, this value is still 500 mm/50 inch.

V 1.02.2 (18.05.2017)
- Common firmware for precipitation sensors OTT Pluvio² L and OTT Pluvio² S
- Improved temperature compensation up to 10 K/h
- Automatic detection for maintenance activities "Emptying the collecting bucket" and "Adding anti-freeze agent for winter operation" has been optimized
- Impulse factors 0.5 mm and 1.0 mm have been added (now 0.05 mm · 0.1 mm · 0.2 mm · 0.5 mm  · 1.0 mm selectable)
- Various minor bugfixes and firmware optimizations

V 1.00.5 ... V 1.02.1
– Internal versions, not published

V 1.00.4 (14.04.2016)

- Initial version