- Modbus poll coupon how to#
- Modbus poll coupon trial#
If the total time of polling all devices is less than or equal to the "Polling interval" of any request in the queue. You cannot connect devices to different COM ports if you are going to combine the data received from these devices using the "Aggregation" module, as described above. When you should not connect devices to different COM ports: Set up the polling of devices separately for each configuration. Create a separate configuration for each COM port by using the "green plus" button in the application’s main window. To set up the polling of MODBUS devices connected to two or more ports, do the following: If all MODBUS devices were initially connected to one COM port, you could double the polling speed by connecting them to two COM ports. 
To speed up the polling of multiple MODBUS devices, you can connect them to different COM ports. In the module properties, enter one name for each request (Figure 13).įigure 12: Selecting a data filtering moduleįigure 13: Configuring the data filtering module What is the right way to poll multiple devices?.Turn on the "Aggregation" data filtering module (Figure 12).You can combine up to eight requests this way. For example, for the first request, enter VALUE_A1 for the second request, VALUE_B1. In each request, specify unique names for the response items.
Modbus poll coupon 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 coupon 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 In the window that opens (Figure 11), switch to the "All active items" tab.Reopen the data export module list and double-click "DDE Server.".Let the application send a request and receive a response.
Turn on that module on the "Data export" tab by checking the checkbox to the left of the "DDE Server" item.įigure 10: Selecting the data export module. You can easily do that using the "DDE Server" data export module. 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. 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
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