Siemens SIMATIC S7-1500 Function Manual page 18

Interfaces of communications modules for point-to-point connections
The communication modules for point-to-point connections provide communication via their
RS 232-, RS 422- and RS 485 interfaces, for example, Freeport or Modbus communication.
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Figure 2-4
Communication
Function Manual, 11/2019, A5E03735815-AH
Interface for point-to-point connections
Example of interface for point-to-point connection at the CM PtP RS422/485 BA
Product overview
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