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MODBUS to MySQL: Writing MODBUS values to MySQL database

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Configuring how to write MODBUS data to a MySQL database is very much similar to configuring how to write data to MSSQL. Only main differences are described in this manual.

1. Download and install the 32-bit version of MySQL ODBC Connector (the ODBC driver) for MySQL from mysql.org.

Driver section
Fig. 1 Driver section

2. The structure of a table in the database will look like this:

CREATE TABLE `modbus_data_2` (
  `REC_ID` int(11) NOT NULL AUTO_INCREMENT,
  `TIMESTAMP` datetime NOT NULL,
  `ITEM1` int(11) DEFAULT NULL,
  `ITEM2` double DEFAULT NULL,
  PRIMARY KEY (`REC_ID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

If you specify any other data type than String for ITEM1 or ITEM2 in the MODBUS settings, you should create the columns of the corresponding types while creating a table.

3. Create an ODBC data source for your MySQL database.

4 Follow steps #1-9 from the previos tutorial for MS SQL: "Writing MODBUS values to MS SQL".

5. During "Binding", you should take into account that the names of the table and its columns are case-sensitive in MySQL.

Related articles:

MODBUS RTU, MODBUS ASCII, MODBUS/TCP