Siemens SIMATIC S7 System Manual page 782

Technical specifications
A.11 S7-200 SMART cables
Use the RS-232/PPI Multi-Master Cable for Freeport operation
For connection directly to your personal computer:
● Set the PPI/Freeport mode (Switch 5=0)
● Set the baud rate (Switches 1, 2, and 3)
● Set Local (Switch 6=0). The Local setting is the same as setting the PC/PPI cable to
DCE.
● Set the Protocol select to 10 Bit (Switch 7=1). See Note below.
For connection to a modem:
● Set the PPI/Freeport mode (Switch 5=0)
● Set the baud rate (Switches 1, 2, and 3)
● Set Remote (Switch 6=1). The Remote setting is the same as setting the PC/PPI cable to
DTE.
● Set the Protocol select to 10 Bit (Switch 7 = 1). See Note below.
Note
The CRxxs CPUs require the protocol select switch 7 to be set to 1 to allow Freeport mode.
Setting switch 7 to 0 disables Freeport mode in the CRxxs CPUs.
The SR and ST CPUs ignore the select switch 7 setting.
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System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART