Siemens SIMATIC S7-1200 System Manual page 1113

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You can set up the initial static configuration of the port in the device configuration

properties, or just use the default values. You can execute the Send_Config instruction in

your program to change the configuration.

The CPU does not permanently store the values you set with the Send_Config instruction.

The CPU restores the parameters configured in the device configuration when the CPU

transitions from RUN to STOP mode and after a power cycle. See Configuring transmit

(send) parameters (Page 1096).

Table 13- 11 Data types for the parameters

Parameter and type

S7-1200 Programmable controller

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

Activate the configuration change on the rising edge of this input. (Default

value: False)

After you install and configure a CM or CB communication device, the port

identifier appears in the parameter helper drop-list available at the PORT

box connection. The assigned CM or CB port value is the device configura-

tion property "hardware identifier". The port symbolic name is assigned in

the "System constants" tab of the PLC tag table. (Default value: 0)

Number of milliseconds to wait after enabling RTS before any Tx data

transmission occurs. This parameter is only valid when hardware flow con-

trol is enabled. The valid range is 0 - 65535 ms. A value of 0 disables the

feature. (Default value: 0)

Number of milliseconds to wait after the Tx data transmission occurs before

RTS is disabled: This parameter is only valid when hardware flow control is

enabled. The valid range is 0 - 65535 ms. A value of 0 disables the feature.

(Default value: 0)

This parameter specifies that a break will be sent upon the start of each

message for the specified number of bit times. The maximum is 65535 bit

times up to an eight second maximum. A value of 0 disables the feature.

(Default value: 12)

This parameter specifies that the line will remain idle for the specified num-

ber of bit times before the start of each message. The maximum is 65535 bit

times up to an eight second maximum. A value of 0 disables the feature.

(Default value: 0)

Specifies the number and the characters in the end delimiter. The end de-

limiter is embedded in the transmit buffer (characters only) and marks the

end of the transmitted message (characters are transmitted until the end

delimiter is encountered). The end delimiter is appended to the end of the

STRING[2,0,xx,yy] – End delimiter is not used (default)

STRING[2,1,xx,yy] – End delimiter is a single character

STRING[2,2,xx,yy] – End delimiter is two characters

Either USR_END or APP_END must have a length of zero.

Communication processor and Modbus TCP

13.3 Point-to-point (PtP) communication

Siemens SIMATIC S7-1200 System Manual page 1113

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