Point-To-Point (Ptp) Communication - Siemens S7-1200 System Manual

Hide thumbs Also See for S7-1200:

Table of Contents

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:

● USS (Page 712)

● Modbus (Page 727)

PtP provides maximum freedom and flexibility, but requires extensive implementation in the

user program.

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG

Communication processor and Modbus TCP

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

This type of PtP communication is serial

communication that uses standard UARTs to support a

variety of baud rates and parity options. The RS232

and RS422/485 communication modules (CM 1241)

and the RS485 communication board (CB 1241)

provide the electrical interfaces for performing the PtP

communications.