User manual

IEC61131 User and Reference Manual
April 22, 2008
68
Modbus RTU
Introduction
The Modbus RTU protocol driver is used to communicate over a serial network, using
Modbus RTU framing, to SCADAPack controllers configured for Modbus RTU protocol.
 To configure a Modbus RTU protocol connection, highlight Modbus RTU in the
Communication Protocols window and click the Configure button. The Modbus RTU
Configuration window is displayed.
 To select a configured Modbus RTU protocol connection, highlight Modbus RTU 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 RTU is selected for configuration the Modbus RTU Configuration dialog is
opened with the General tab selected as shown below.
Figure 21: Modbus RTU 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.