Siemens SIMATIC S7-1200

Communication processor and Modbus TCP
13.3 Point-to-point (PtP) communication
S7-1200 Programmable controller
1090 System Manual, V4.2, 09/2016, A5E02486680-AK
13.3
Point-to-point (PtP) communication
The CPU supports the following Point-to-Point communication (PtP) for character-based
serial protocols:
● PtP, Freeport (Page 1090)
● PtP, 3964(R) (Page 1092)
● USS (Page 1146)
● Modbus (Page 1166)
13.3.1
PtP, Freeport communication
PtP with a Freeport, or freely constructed, protocol provides maximum freedom and
flexibility, but requires extensive implementation in the user program.
PtP enables a wide variety of possibilities:
•
The ability to send information directly to an external
device such as a printer
•
The ability to receive information from other devices
such as barcode readers, RFID readers, third-party
camera or vision systems, and many other types of
devices
•
The ability to exchange information, sending and
receiving data, with other devices such as GPS
devices, third-party camera or vision systems, radio
modems, and many more
This type of PtP communication is serial communic
a-
tion that uses standard UARTs to support a variety of
baud rates and parity options. The RS232 and
RS4
22/485 communication modules (CM 1241) and
the RS485 communication board (CB
1241) provide
the electrical interfaces for performing the PtP comm
u-
nications.