Huawei - Activate Modbus TCP

The following guide describes how to configure the Modbus TCP  settings for Huawei inverters and how to test the connection.

Prerequisites​

Hardware Requirements​

  • Mobile device
    • iPhone with iOS 10.0  or later
    • Android with Android 4.0  or later
  • Huawei SDongle
  • Internet connectivity
  • WiFi  capability

Software Requirements​

  • SUN2000  App (version 3.2.00.015  or later)
  • Available from Huawei AppGallery

Configuration Process​

Initial Setup​

  1. Install SUN2000  App from Huawei AppGallery
  2. Ensure SDongle  remains powered throughout configuration

Connection Setup​

  1. Open SUN2000  App
  2. Select Connect  → WLAN
  3. Choose inverter's WiFi network
  4. Enter password:
    • First login: Changeme
    • Change password after initial login

Modbus Configuration​

  1. Login as installer (default password: 00000a )
  2. Navigate to: Settings  → Communication Configuration  → Dongle Parameter Settings  → Modbus-TCP
  3. Select appropriate access mode:
    • Unrestricted : Allows all LAN devices (one at a time)
    • Restricted : Requires setting trusted IP address
    • Disabled : No Modbus access

Important Notes​

  • Configuration settings persist through power cycles
  • New inverters require fresh configuration
  • SDongle  replacement doesn't require reconfiguration
  • Keep SDongle  powered during configuration process

Troubleshooting​

Missing Modbus Options​

If Modbus settings are not visible:

  1. Check firmware versions
  2. Update app if necessary
  3. Verify SDongle  compatibility

Connection Problems​

If unable to connect:

  1. Ensure SDongle  is powered
  2. Stay within WiFi range
  3. Verify correct password

Testing connectivity (advanced)

Once you've configured Modbus TCP on your Huawei inverter, it's essential to verify that the connection is working correctly. You can follow our testing guide to confirm the connection. For Huawei inverters, note that the default Modbus port is 6607, which differs from the standard Modbus port. The Unit ID is typically set to 1. If you've enabled the restricted access mode, make sure you're testing from an allowed IP address.


Access Issues​

If experiencing access problems:

  1. Check IP restrictions if enabled
  2. Verify only one client is connecting
  3. Confirm network settings are correct

Source​

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