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15 DATA COMMUNICATIONS USING USER FRAMES
15.2 Data Reception
Timing for start/completion of data reception
This section explains the reading of received data based on the user frame and other factors (such as the receive end code
and receive end data quantity) during data reception using a user frame.
Timing for start/completion of data reception
The following describes the timing for start/completion of the data reception processing with C24.
• Data reception using a user frame
• Data reception using the receive end code and receive end data quantity initially set in C24
• Data reception using 'method 1 dedicated receive end data quantity'
Type Setting of the
receive user
frame
When using Method 0 When using Method 1
Data
receptio
n start
With a start frame When the start frame is received.
Without a start frame When the first data of arbitrary data is received.
Data
receptio
n
completi
on
The factors of data reception completion (timing of reading received data to the CPU module) is one of the following:
(Depends on the conditions of the prior settings. Page 285 Timing chart for reception processing of C24)
• When the final frame is received.
• When data of the receive end code is received. (In the
case of a combination without the start frame)
• When data which is equivalent to the receive end data
quantity is received.
• When a reception error (time out for the no-reception
monitoring time (timer 0)) occurs.
• When the start frame is received while "0" is specified for
the 'method 1 dedicated receive end data quantity'.
• When data which is equivalent to the 'method 1 dedicated
receive end data quantity' is received while "1" or more is
specified for the 'method 1 dedicated receive end data
quantity'.
• When a reception error (time out for the no-reception
monitoring time (timer 0)) occurs.
Arbitrary data portion up to the reception of any listed above or the occurrence of a reception error is stored in the receive
area in the buffer memory.
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