Configuring The 3964(R) Priority And Protocol Parameters - Siemens SIMATIC S7-1200 System Manual

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Table of Contents

Communication processor and Modbus TCP

13.3 Point-to-point (PtP) communication

Operating mode*

Receive line initial state*

Data bits per character

Number of stop bits

* CM 1241 (RS422/485) module only

Configuring the 3964(R) priority and protocol parameters

You can use either of the following methods to configure the communication interfaces for

3964(R) communication:

● In the device configuration of the communication interface, click "3964(R) configuration"

to set the priority and configure the protocol parameters. The CPU stores the device

configuration settings and applies the settings after a power cycle.

● Use the P3964_Config (Page 1120) instruction to set the priority and protocol

configuration parameters. The values set by the instructions are valid while the CPU is in

RUN mode. The values revert to the device configuration settings after a power cycle.

3964R or Freeport. Select 3964R to configure port for 3964(R) communication

Full duplex (RS422) four-wire operation point-to-point. (Enabled)

Enable one of the following choices:

Bias with R(A)>R(B)>=0V

Bias with R(B)>R(A)>=0V

Enable one of the following choices:

No wire-break check

Enable wire-break check

The default value for the baud rate is 9.6 Kbits per second. Valid choices are: 300 baud,

600 baud, 1.2 Kbits, 2.4 Kbits, 4.8 Kbits, 9.6 Kbits, 19.2 Kbits, 38.4 Kbits, 57.6 Kbits, 76.8

Kbits, and 115.2 Kbits.

The default value for parity is no parity. Valid choices are: No parity, even, odd, mark (parity

bit always set to 1), space (parity bit always set to 0), and any parity (set parity bit to 0 for

transmission; ignore parity error when receiving).

The number of data bits in a character. Valid choices are 7 or 8.

The number of stop bits can be either one or two. The default is one.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK