Yes — Modbus is supported. VOOL chargers expose a Modbus TCP/UDP interface, and the LMC exposes Modbus as well. This is the supported route for local integrations such as Home Assistant.
Enabling Modbus on a charger
The interface is disabled by default. It is enabled with the charger parameter 522 — Enable Modbus TCP/UDP interface. Once enabled, the interface listens on port 502 (TCP and UDP); the parameter number 522 is not the port. Modbus runs on the same single interface (Ethernet or Wi-Fi) as the charger's other traffic — a hybrid setup with Modbus on one and OCPP on the other is not supported.
If you cannot find or change this setting yourself, VOOL support can enable Modbus remotely for a given serial number, usually within a working day.
Enabling Modbus on the LMC
On the LMC, Modbus is enabled from the LMC's own interface: installer mode → OCPP settings → enable Modbus. Support can also enable it remotely on request.
Register map
The charger's Modbus registers — live state, currents, voltages, power, energy, plus writable registers for start/stop, an external current limit and allowed phases — are documented in full in the Charger Modbus manual in this help centre.
If a working integration stops responding
Check the device's current IP address first. After a firmware update or a router change the charger's LAN IP can change, and the integration then polls an address that no longer exists. The charger's current IP is visible in the web portal — compare it with the address configured in your integration before assuming the interface is off.
Set a static IP (or a DHCP reservation) for chargers and the LMC in your router. Router-assigned address changes have also broken load-management communication at multi-charger sites.
Check the device is on the same subnet as the machine polling it, and remember the interface allows at most 3 simultaneous connections.
Security note
The Modbus interface has no authentication. Use it only in local, secure networks.
Community integrations and partner APIs
There are third-party Home Assistant integrations for VOOL hardware. They are not built or maintained by VOOL, and some do not work with the LMC without adjustment. For questions about a community integration, please contact its author.
Modbus and OCPP are the documented integration paths. For partner or developer API questions, email [email protected] with your questions numbered and we will route them internally.