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MODBUS power meter data logging ( easy method).Related articles: MODBUS RTU, MODBUS ASCII, MODBUS/TCP How to write data to various databases is described in the following parts (see links below). In this case, "10" means skipping five 2-byte registers. For the second response item, specify the offset in bytes relative to the beginning of the array.In the "Data type" field, select a data type for each response item: Decimal 16 bit, Signed.As a result, the values will be named AIN1. Check the "Append counter to name" checkbox.In the "Count" field, enter the number of values: 4.In the "Name" field, enter the base name for each value: ain or aot.In the request properties, specify reading of nine registers, starting from 0003. You need to read the values of analog inputs and outputs according to the following MODBUS register map:
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In the previous examples, the offset was "-1" the application counted the offset automatically depending on the amount of data in the previous response items.Ĭase 5 (Figure 7). In this case, "8" means skipping four 2-byte registers.
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As a result, the resulting value names will be VALUE1 and VALUE2.
#Modbus poll how to use full#
Uncheck the "Append counter to name" checkbox, because full names have been defined via the "Name" field.In the "Count" field, enter the number of values: 1.In the "Name" field, enter the base name for each value: VALUE1 or VALUE2.Add two response items: Select "Response items" in the tree and click "Actions → Add response item.".Each register holds 16 bits, but of a different data type (signed and unsigned). If the value is unsigned, check the "Unsigned" checkbox.Ĭase 2 (Figure 4).In the "Data type" field, select the data type depending on the number of data bits.As a result, the values will be named VALUE1 and VALUE2. Check the "Append counter to name" checkbox: The application will automatically add the index number (1 or 2) to the base name.In the "Count" field, enter the number of values: 2.In the "Name" field, enter the base name for each value: VALUE.Each value consists of two bytes (2 * 8 = 16 bits). The meaning of these bytes depends on the MODBUS device’s firmware version and register map.Ĭase 1 (Figure 3). In the example, four bytes will be read, starting from the address 8214. Each register contains two bytes (16 bits) of data. For example, in the example shown in Figure 3, two registers located at the address 8214 are read. Otherwise, the application will be unable to disassemble MODBUS packets. Please note that you must define response items for the device and format of these items.
#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. 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).