Communication processor and Modbus TCP
13.3 Point-to-point (PtP) communication
S7-1200 Programmable controller
1100 System Manual, V4.2, 09/2016, A5E02486680-AK
With this configuration, the start condition is satisfied when either pattern occurs:
● When a five-character sequence is received where the first character is 0x6A and the fifth
character is 0x1C. The characters at positions 2, 3, and 4 can be any character with this
configuration. After the fifth character is received, evaluation of end conditions begins.
● When two consecutive 0x6A characters are received, preceded by any character. In this
case, evaluation of end conditions begins after the second 0x6A is received (3
characters). The character preceding the first 0x6A is included in the start condition.
Example sequences that would satisfy this start condition are:
● <any character> 6A 6A
● 6A 12 14 18 1C
● 6A 44 A5 D2 1C
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