Reading data from MODBUS Sunspec-compatible inverters and power meters

1. Create a new configuration from the main window using the "Green Plus" button. Then configure the connection with your Sunspec-compatible device (fig. 1). This example shows the connection settings for MODBUS TCP. If your device uses MODBUS RTU, look here.

Fig. 1: IP connection settings

2. Click "OK" and save the connection settings. Now, the program saved and applied the communication settings, and you can continue configuring data logging.

3. Go to your configuration setting again (Main window → Options → Manage configurations → Modules → Query Parser Filter). Select the "MODBUS TCP" or "MODBUS RTU" plugin from lists. Then click the "Setup" button.

Fig. 2: Selecting the MODBUS plugin

4. Click "Action → Add Sunspec compatible device" (fig. 3).

Fig. 3: Adding a MODBUS device

5. Specify the device address (fig. 4). MODBUS TCP devices generally use the address "1".

Fig. 4: Entering a device address

6. The logger will start reading device information. If the operation completes successfully, you can select the necessary MODBUS registers from the showed list (fig. 5).

Fig. 5: Registers map

7. Adjust the polling interval as you want in the "Polling Interval" field.

8. Click the "OK" button. The program adds one or more requests to the queue (fig. 6). The number of requests depends on the values quantity and their location in the device memory.

Fig. 6: MODBUS queue

9. Enable the "Export data for all requests at once" option (fig. 6).

RS-485 or RS-232: if you connect several devices to the RS-485 network, you may specify several addresses like 1,2,3,4,5 in the "Device address" field.

Usually, all devices have the device address "1" and a different IP address. Therefore, you should add multiple IP address in the IP connection settings (fig. 1).