This step configures and opens a reference for a Modbus Serial communication.
To configure this step open the Edit Step window from sequence editor.
In the configuration dialog box, you can change the following settings:
· Connection Name: connection used to communicate with the device.
· Serial Port: serial port resource use to communicate with the device.
· Serial type: select RTU or ASCII communication mode for the selected device.
· Unit ID: device targeted by all Modbus master read and write operations.
Serial Configuration:
· Baud Rate: serial communication transmission rate.
· Flow Control: flow control for communication with the device.
· Parity: parity used for the serial communication.
· Timeout: communication timeout in milliseconds for the specified connection.
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Note According to Modbus specification, Stop Bits is deduced from Flow Control and Parity configuration. By default, Modbus communication use parity and one stop bit, therefore if Parity selected is “None” an additional stop bit is transmitted. |
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Note Please read Execution Trace and Steps Variables chapter to learn more about accessing configuration of this step. |
See Also
