#MODBUS POLL HOW TO USE SERIAL#
#MODBUS POLL HOW TO USE TRIAL#

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 deviceРІР‚в„ўs firmware version and register map.Р”В¬ase 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 РІвЂ вЂ™ Programs РІвЂ вЂ™ Advanced Serial Data Logger РІвЂ вЂ™ Help). You can grasp the meaning of request options from their names. When a window opens (Figure 3), click 'Action РІвЂ вЂ™ 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.Р”Р‡igure 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.Р”Р‡igure 1: Connection settings Configuring the polling via MODBUS MODBUS devices are usually connected to the computer via the RS485 interface, with a special converter.

You know the connection settings for the devices (baud rate, number of data bits, and so on).Р”В¬onfigure the connection (Figure 1).

You know the register addresses where the values that you need are stored.

You have already worked with MODBUS devices.

The MODBUS RTU module for the data logger.

#MODBUS POLL HOW TO USE TRIAL#

Advanced TCP/IP Data Logger Professional, Enterprise, or a trial version.

MODBUS polling for two MODBUS devices and log the data received to the database.

MODBUS RTU polling: Configuring master station.

Modbus poll how to use