Siemens SIMATIC S7 System Manual page 453

Configuring RS485 network information in the System Block dialog
RS485 network information configuration or changes done in the system block are part of the
project and do not become active until you download your project to the CPU.
To access this dialog, perform one of the following:
Enter or change the following access information:
● RS485 port address
● RS485 port baud rate
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
• In the navigation bar, click the "System Block" button.
• In the Project tree, select the "System Block" node, then
press Enter; or double-click the "System Block" node.
Communication
8.6 RS485
453