Siemens SIMATIC S7-1200 System Manual page 1139

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● Receive message end configuration: Configure the CM 1241 to end a message when it

receives a maximum of 100 bytes or a linefeed character (10 decimal or a hexadecimal).

The end sequence allows up to five end characters in sequence. The fifth character in the

sequence is the linefeed character. The preceding four end sequence characters are

"don't care" or unselected characters. The CM 1241 does not evaluate the "don't care"

characters but looks for a linefeed character preceded by zero or more "don't care"

characters to indicate the message end.

S7-1200 Programmable controller

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

Communication processor and Modbus TCP

13.3 Point-to-point (PtP) communication