Communication
8.6 RS485
S7-200 SMART
406 System Manual, 09/2015, A5E03822230-AC
If your HMI device allows you to select the communication protocol, consider the following
guidelines:
● For an HMI device connected to the communication port of the CPU, with no other
devices on the network, select the PPI protocol for the HMI device.
● For an HMI device connected to the communication port of the CPU which has been
configured as a master, select the PPI protocol for the HMI device. Advanced PPI is
optimal.
For more information about how to configure the HMI device, refer to the specific manual for
your device (see the following table). These manuals are included in the
STEP 7-Micro/WIN SMART documentation CD.
Table 8- 21 RS485 HMI devices supported by the S7-200 SMART CPU
Text Display wizard (part of STEP 7-Micro/WIN SMART)
KTP600 DP WinCC flexible
Creating user-defined protocols with Freeport mode
Introduction
Freeport mode allows your program to control the communication port of the
S7-200 SMART CPU. You can use Freeport mode to implement user-defined
communication protocols to communicate with many types of intelligent devices. Freeport
mode supports both ASCII and binary protocols.
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