Configuring The Communication Ports - Siemens S7-1200 System Manual

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Communication processor and Modbus TCP

12.3 Point-to-point (PtP) communication

Configuring the communication ports

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

● Use the device configuration in STEP 7 to configure the port parameters (baud and

parity), the send parameters and the receive parameters. The CPU stores the device

configuration settings and applies the settings after a power cycle and a RUN to STOP

● Use the PORT_CFG (Page 686), SEND_CFG (Page 688), and RCV_CFG (Page 689)

instructions to set the parameters. The port settings set by the instructions are valid while

the CPU is in RUN mode. The port settings revert to the device configuration settings

after a STOP transition or power cycle.

After configuring the hardware devices (Page 137), you configure parameters for the

communication interfaces by selecting one of the CMs in your rack or the CB, if configured.

For the CM 1241 RS232 and CB RS485 (except for flow control (Page 674), which only the

CM 1241 RS232 supports), the port configuration parameters are the same regardless of

whether you are configuring an RS232 or an RS485 communication module or the RS485

communication board. The parameter values can differ.

For the CM 1241 RS422/485, you have additional options for port configuration as shown

below. The 422 mode of the CM 1241 RS422/485 module also supports software flow

The "Properties" tab of the inspector window

displays the parameters of the selected CM or

CB. Select "Port configuration" to edit the

following parameters:

• Data bits per character

• Number of stop bits

• Flow control (RS232 only)

System Manual, 03/2014, A5E02486680-AG

S7-1200 Programmable controller