Firmware v1 overview
Information for P1 Modbus Dongles that still use legacy firmware v1.
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Information for P1 Modbus Dongles that still use legacy firmware v1.
Firmware v1 is the legacy firmware generation. Each mapping or use case is delivered as a separately compiled firmware variant with its own defaults. It remains documented for existing installations, but new dongles and new integrations should use firmware v2.
Existing dongles with firmware v1 can be migrated to firmware v2. See Migrate from v1 to v2.
The Modbus mapping is selected by installing a specific firmware variant.
Default device ID, baud rate and serial format may differ between variants.
Configuration is primarily performed through Modbus registers and the physical button.
The firmware does not provide the complete v2 Device Manager experience.
Firmware v1 therefore behaves fundamentally differently from v2: changing the application or mapping generally means selecting and installing another firmware variant.
The existing v1 mapping reference has been retained under Firmware v1 register mappings. Mapping availability, device ID and serial defaults depend on the specific v1 firmware variant installed on the dongle.
Before changing or updating a v1 installation, record the installed mapping, device ID, baud rate and serial format. These values are needed when selecting or configuring the replacement firmware.
Legacy firmware variants and recovery installation remain available through the P1 Modbus web installer.
When upgrading to v2, reconnect through the Device Manager and select the required mapping and communication settings after installation.
There is no need to upgrade a stable v1 installation solely because v2 is available. Migration is supported and recommended when you need configurable mappings, Device Manager support, newer emulations, monitoring or integrated firmware updates.
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