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Each register holds 16 bits, but of a different data type (signed and unsigned).
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#MODBUS POLL HOW TO USE SERIAL#
For more information on request options, see the Help for the module (Start → Programs → Advanced Serial Data Logger → Help). You can grasp the meaning of request options from their names. When a window opens (Figure 3), click "Action → Add new request" to add one or more requests.
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On the "Query Parse Filter" tab, select that module and click the "Setup" button to the right of the module name in the list.įigure 2: Selecting the data query and parser module To configure the polling, use the MODBUS RTU module in ASDL (Figure 2). When polling a MODBUS device and capturing data, the computer is the "master," and the device is the "slave." It means that the application running on the computer sends MODBUS requests, and the device replies to them. If that is the case, check the "RS485 interface mode" checkbox.įigure 1: Connection settings Configuring the polling via MODBUS MODBUS devices are usually connected to the computer via the RS485 interface, with a special converter. It allows you to try all features! Plugins can be downloaded separately hereĬonfigure the connection (Figure 1).