Point-To-Point (Ptp) Communication - Siemens SIMATIC S7 System Manual

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Termination and bias for the CB 1241

Terminating device (bias ON)

Connect M to the cable shield

A = TxD/RxD - (Green wire / Pin 8)

B = TxD/RxD + (Red wire / Pin 3)

Point-to-Point (PtP) communication

The CPU supports the following Point-to-Point communication (PtP) for character-based

serial protocols. PtP provides maximum freedom and flexibility, but requires extensive

implementation in the user program.

● PtP (Page 531)

● USS (Page 567)

● Modbus (Page 581)

PtP communication is serial communication that uses standard UARTs to support a variety

of baud rates and parity options. The RS232 and RS485 communication modules and the

RS485 communication board provide the electrical interfaces for performing the PtP

communications.

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

12.3 Point-to-Point (PtP) communication

Non-terminating device (bias OFF)

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

 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

105BCommunication processor

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Simatic s7-1200