> For the complete documentation index, see [llms.txt](https://docs.irs.systems/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.irs.systems/cmm-iv/release-notes.md).

# Release Notes

### V4.12 (2025-07-15)

* Added: Reject Init command when wrong OnOffMode is set
* Changed: Allow padded IsoTP messages
* Changed: Reduce CAN-BUSOFF error to warning and add short LED blink for warnings

### V4.8 (2024-11-20) <a href="#v48-2024-11-20" id="v48-2024-11-20"></a>

* Fixed: Potential problem in bootloader, which could lead to failed update
* Fixed: Improved average calculation. For large sample numbers (>1M) the calculation was inaccurate.
* Removed: Commands Set- and GetPort

### V4.4 (2023-11-09) <a href="#v44-2023-11-09" id="v44-2023-11-09"></a>

* Added: Red LED is switched on when error register is set

### V4.3 (2023-11-07) <a href="#v43-2023-11-07" id="v43-2023-11-07"></a>

* Added: Set/Get sample rate in IsoTP commands
* Added: ReadCurrent commands with more than 100 values (only over TCP)
* Changed: Improved CAN bus off error handling
* Changed: Improved error handling for UDP streaming
* Fixed: Bug in Init-Trigger-Fetch mode, where trigger was never reset

### V3.8 (2023-03-31) <a href="#v38-2023-03-31" id="v38-2023-03-31"></a>

* Added: Checks for calibration values
* Changed: Updated UPD identification broadcast to v1.1

### V3.7 (2022-10-17) <a href="#v37-2022-10-17" id="v37-2022-10-17"></a>

* Added: Error handler now sends UDP broadcast with error info and reboots CMM IV
* Changed: Latch for drop voltage measurement is now checked and reset cyclically
* Changed: CMM IV now returns faster from highest range after a high drop voltage was detected
* Fixed: Bug which could cause wrong measurement values when switching to lower range
* Fixed: Bug which caused FETs to not be set to error mode

### V3.0 (2022-02-07) <a href="#v30-2022-02-07" id="v30-2022-02-07"></a>

* Changed: Sync major version number with version number of GUI/DLL
* Changed: Reset command now closes all active TCP connections
* Added: Bootloader command "sector erase" because "normal" multi sector erase causes TCP timeout
* Added: Ethernet command "MinMaxMeanAndRange"
* Added: Some debug commands
* Added: Support for multiple TCP connections for commands
* Known limitation: Measurements with interleaved Init and Fetch are not possible
* Example: Init1, Init2, Fetch1, Fetch2. This sequence is NOT possible

### V2.6 (2021-10-28) <a href="#v26-2021-10-28" id="v26-2021-10-28"></a>

* Changed: Updated build tools (no functional change)

### V2.5 (2021-10-14) <a href="#v25-2021-10-14" id="v25-2021-10-14"></a>

* Added: Hardware trigger via On/Off pin for Streaming
* Changed: Default IP address to 192.168.222.21
* Changed: Disabled MCO pin, this could slightly improve measurement accuracy
* Fixed: Adc\_GetSampleRate() now returns correct value if sample rate is set to 50 kHz

### V2.2 (2021-07-19) <a href="#v22-2021-07-19" id="v22-2021-07-19"></a>

* Added: Watchdog for UDP streaming
* Changed: Streaming from TCP to UDP
* Changed: Replace sample rate value 62.5 kHz with 50 kHz
* Changed: Cyclic CAN messages are now reenabled after streaming
* Fixed: Interval for cyclic CAN messages is now recaculated when sample rate changes

### V1.65 (2021-07-07) <a href="#v165-2021-07-07" id="v165-2021-07-07"></a>

* Added: Command SampleRate to allow slower streaming
* Changed: Error handling when streaming, flag used instead of string
* Changed: Reduced drive strength of RGMII pins, this should improve measurement accuracy
* Fixed: Bugs in streaming
* Fixed: Missing NULL termination in command MinMaxMean
* Fixed: Bug which printed wrong values in ReadCurrent command

### V1.61 (2021-06-10) <a href="#v161-2021-06-10" id="v161-2021-06-10"></a>

* First public release


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