Configuring the Modbus Function

If a Remote Output Control Device is installed in the system and an active connection is established between the Remote Output Control Device and the inverter, the Modbus interface of the inverter is automatically enabled and the communication ports 502 are set. Changes to the Modbus configuration may cause the communication between the Remote Output Control Device and the inverter not to function properly.

If there is no active connection established to a Remote Output Control Device, the Modbus interface is disabled and the communication ports 502 are set. If you want to use the Modbus interface, the Modbus interface must be enabled. After activating the interface, the communication ports of both IP protocols can be changed. For information on commissioning and configuration of the Modbus interface, see the technical information "SMA and SunSpec Modbus® Interface" at www.SMA-Solar.com..

For information on which Modbus registers are supported, see the technical information "Modbus® parameters and measured values" at www.SMA-Solar.com.

Measures for data security during activated Modbus interface

If you activate the Modbus interface, there is a risk that unauthorized users may access and manipulate the data or devices in your PV system.

To ensure data security, take appropriate protective measures such as:

1. Set up a firewall.
2. Close unnecessary network ports.
3. Only enable remote access via VPN tunnel.
4. Do not set up port forwarding at the communication port in use.
5. In order to deactivate the Modbus interface, reset the inverter to the default settings or deactivate the activated parameter again.

Procedure: