Names of groups, elements and commands are arbitrary. A command number identifies the command within Rapid SCADA. A command is described by its name, data table and address. Rapid SCADA identifies a tag by its signal number. Each group has its name, data table, start address and element count. Requested data are combined into groups of elements. This article uses the existing template KpModbus_Adam6015.xml, which was previously copied to the project directory C:\SCADA\Projects\ModbusTest\Instances\Default\ScadaComm\Config\ĭevice template reflects the structure of Modbus packages. When the create button or the edit button is clicked, the Device Template Editor is shown (see Figure 8). Press the button to select an existing device template, or click to create a new template. In the form choose the Modbus type, which have to be specified in the device manual. Commands are sent immediately after a poll is completed.Ĭlick the Properties button to open the device properties form (see Figure 7). If device polling time and period are not specified, the devices are polled cyclically. Go to the Request Sequence page and select the "Test device" row (see Figure 6). All devices connected to a one communication line must operate using the same Modbus type and with the same baud rate.
In the RTU and ASCII modes, the baud rate specified in the Communicator settings and set on the devices must match.
#Modbus poll command serial
If communication is performed via a serial port, the typical serial port parameters, depending on the Modbus type, are listed in the table below.
The main parameters of the communication line In case of Modbus communication, the most common channel types are TCP client and Serial Port.įigure 5. Configure the communication channel which settings are presented on the Main Parameters page (see Figure 5). In the project explorer, go to the Communicator settings, expand the node of the just created communication line and double click the Line Parameters node. Make sure that the corresponding communication line and device were created in the Communicator settings. Open the Communication lines and Devices tables to check that the communication line and device were successfully added to the tables. IP address, if the device is connected via Ethernet. Modbus address of your device, for example, 1 Pay attention to the following fields when adding a device: Device type: After that click the button and add the device 1 "Test device" (see Figure 4). Using the wizard, add the line 1 "Test line" (see Figure 3). Click the toolbar button to open the communication line wizard. The setup process fully consistent with the article if the empty project named EmptyProject.en-GB is selected as a template.Įxpand the Configuration Database node, open the Objects table and add a new row for the object 2 "Test object" (see Figure 2). Enter a project name in the dialog and click the OK button. Run Administrator and click the New Project button. The following is a step by step guide to setup a new Modbus device. Define the views in the configuration database.
#Modbus poll command how to
This article describes how to configure communication with devices using Modbus protocol. Written by Rapid SCADA on January 5, 2015 Connecting Devices Using Modbus Protocol - Rapid SCADA Documentation Connecting Devices Using Modbus Protocol
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