Migrate from v1 to v2

Upgrade an existing P1 Modbus Dongle from legacy firmware v1 to firmware v2.

P1 Modbus Dongles running firmware v1 can be migrated to firmware v2. The hardware does not need to be replaced.

Treat the migration as a new configuration. Record the current settings before installing v2; do not assume that v1 settings will be transferred automatically.

Before migration

Record the settings used by the connected Modbus master:

• Installed mapping or v1 firmware variant

• Modbus device ID

• Baud rate

• Serial format, for example 8N1 or 8E1

• Pre-v4 smart meter mode, if applicable

• RS485 termination setting, if available on the hardware

If possible, temporarily stop the inverter, charger, EMS or other Modbus master while changing the dongle firmware.

Install firmware v2

1. Connect the dongle to the computer using a USB data cable.

2. Open the P1 Modbus web installer.

3. Select the current P1 Modbus Dongle v2 firmware.

4. Start the installation and keep the USB cable connected until it is complete.

Configure the migrated dongle

1. Open the Device Manager.

2. Select Connect and choose the dongle.

3. Select the v2 mapping that corresponds to the previous v1 firmware variant.

4. Restore the recorded device ID, baud rate and serial format.

5. Restore any other required settings and select Save.

6. Verify that valid P1 telegrams and Modbus requests are visible.

7. Re-enable the connected Modbus master and verify its measurements.

After migration, future stable updates can be installed directly through the Device Manager without selecting the dongle a second time.