If you are working with end-of-text characters, transmission is not code-transparent, and you
must make sure that the end code(s) are not in the user data of the user.
Note the following when the last character in the received message frame is not the end-of-text
character.
• End-of-text character elsewhere in the message frame:
All characters including the end-of-text character are entered in the receive DB. The
characters following the end-of-text character
– Is discarded if the monitoring time expires at the end of the message frame.
– Is merged with the next message frame if a new message frame is received before the
monitoring time expires.
• End-of-text character not included in message frame:
The message frame
– is discarded if the monitoring time expires at the end of the message frame.
– Is merged with the next message frame if a new message frame is received before the
monitoring time expires.
The gure below illustrates a receive operation with the end criterion "end-of-text character".
Basic Principles of Serial Data Transmission
2.4 Data Transmission with the ASCII Driver
Point-to-point connection CP 440 Installation and Parameter Assignment
28 Equipment Manual, 03/2022, A5E00057742-AE
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