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MODBUS POLL COMMAND TRIAL
Note: Available only in the Enterprise or trial version. You might need to do that if you read two registers located far from each other by using two different requests and then want to write them in one row to an Excel file, a database, or a text file. Add the visualization block (please refer to the OPC Scada Viewer documentation).Turn on the "OPC server" plugin on the data export modules tab (just like it was described above for the "DDE server" plugin).To make the MODBUS data received from the logger available for OPC Scada Viewer, do the following: We provide OPC Scada Viewer that can receive data from the logger via the OPC interface (for example, like a SCADA system) and visualize them.
MODBUS POLL COMMAND HOW TO
How to view MODBUS register values in a more easy-to-grasp form (graphs, indicators, and so on)? Note: The "srvi" prefix adds the "DDE Server" plugin. There you should see the response items specified in the request properties.įigure 11: Selecting the data export module
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How to make sure that the application correctly interprets the responses received from the device? Please note that if you do that, requests will not be displayed. On the tab shown in Figure 8, turn on the "Display parsed values" option.
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Please note that the response message must be at least as long as the request message.įigure 9: Data communication How to view register values, not raw MODBUS packets? The requests sent to the MODBUS device are highlighted in yellow. In this case, the data communication will look like shown in Figure 9. The value in the "Split strings by data timeout" field must be greater than or equal to the timeout specified in the "Request timeout" field for the MODBUS request.įigure 8: Configuring the data display mode We recommend configuring the data display mode, as shown in Figure 8. How to make sure that the application sends requests and receives responses? It allows you to try all features! Plugins can be downloaded separately here