Basic Principles of Serial Data Transmission
2.4 Data Transmission with the ASCII Driver
Point-to-point connection CP 440 Installation and Parameter Assignment
Manual, 09/2007, A5E00057742-03
37
End Criterion Fixed Message Frame Length
When data is received, the end of the message frame is recognized when the configured
number of characters has arrived. The received data is accepted from the CPU.
If the character delay time expires before the configured number of characters has been
reached, the receive operation is terminated. The character delay time is used in this
instance as the monitoring time. An error message is issued and the message frame
fragment is discarded.
Note the following if the message frame length of the received characters does not match
the configured fixed message frame length:
● Message frame length of received characters greater than configured fixed message
frame length:
All characters received after the parametered fixed message frame length is reached
– 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.
● Message frame length of received characters less than parametered fixed message
frame length:
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.
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