Siemens Simatic S7-300 CP 341 - Figure 2-24 Timing Diagram of Automatic Control of the RS 232 C Accompanying Signals

Basic Principles of Serial Data Transmission
2.6 Data Transmission with the ASCII Driver
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01 73
Timing diagram
The figure illustrates the chronological sequence of a send request.
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Figure 2-24 Timing diagram of automatic control of the RS 232C accompanying signals
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