Firmware v2 overview
Firmware v2 is the current configurable firmware generation for the P1 Modbus Dongle.
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Firmware v2 is the current configurable firmware generation for the P1 Modbus Dongle.
Firmware v2 is a fundamental change from firmware v1. Instead of installing a separately compiled firmware variant for each application, v2 contains all supported Modbus mappings in one firmware image. Mapping, communication settings, monitoring and device control are handled at runtime through the Device Manager.
P1 Modbus Dongles shipped from 15 June 2026 use firmware v2.
Dongles currently running firmware v1 can be upgraded. Follow Migrate from v1 to v2 because the current mapping and communication settings must be recorded and restored after installation.
Separate firmware variant for each mapping or use case
One firmware image containing all mappings
Reflash to change to another mapping variant
Select another mapping in the Device Manager
Configuration mainly through Modbus registers and compiled defaults
Configuration and device control through the Device Manager
Basic status and update workflow
Live status, Modbus monitor and integrated updates
Selectable Modbus mappings in one firmware image
Configuration through the USB Device Manager
Live device, P1 and Modbus status
Persistent configuration stored on the dongle
Integrated stable firmware check and update flow
Modbus request monitor for diagnostics
Improved RGB status indications and hardware diagnostics
Support for P1 and, on compatible hardware, HAN as the smart meter source
The following mappings can be selected in the Device Manager without installing different firmware:
Default - TeltoCharge
Default - floats
SDM630
DTSU666
Alfen
EM330
EM111
ABB B21
EMPRO / MX3xx
KLEFR / Inepro
Phoenix Contact EEM / XM3xx
Charge Pro
DRIS
Wallbox - P1MB
SolarEdge
SunSpec 203
Mapping: Default P1 mapping
Modbus device ID: 43
RS485: 38400 8E1
Smart meter source: SMR (P1)
These values can be changed in the Device Manager. Changing a mapping does not require a firmware update.
Firmware v2 contains native mappings and emulations for integrations that expect a particular meter layout. See Firmware v2 register mappings for the complete list and register tables generated from the v2 recipes.
The preferred update method is the integrated updater in the Device Manager. See Updating firmware v2.
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