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IEC61131 User and Reference Manual
April 22, 2008
53
Modbus ASCII
The Modbus ASCII protocol driver is used to communicate over a serial network, using
Modbus ASCII framing, to SCADAPack controllers configured for Modbus ASCII protocol.
To configure a Modbus ASCII protocol connection, highlight Modbus ASCII in the
Communication Protocols window and click the Configure button. The Modbus ASCII
Configuration window is displayed.
To select a configured Modbus ASCII protocol connection, highlight Modbus ASCII in
the Communication Protocols window and click the OK button.
To close the dialog, without making a selection click the Cancel button.
General Parameters
When Modbus ASCII is selected for configuration the Modbus ASCII Configuration dialog is
opened with the General tab selected as shown below.
Figure 10: Modbus ASCII Configuration (General) Dialog Box
The Modbus Communication Settings grouping contains Modbus specific communication
settings including the addressing mode, the station address, the timeout interval as well as
the number of attempts.