15 DATA COMMUNICATIONS USING USER FRAMES
15.2 Data Reception
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Remarks
The following shows the difference between the reception methods (Method 0 and Method 1) in regard to how to treat the
received data when data in combination of (a start frame + and arbitrary data portion) is received.
■When data is received using Method 0 (combination (1-C))
• C24 regards all arbitrary data portions as valid data after a start frame has been received, and stores it sequentially in the
receive area.
• C24 issues a read request to the CPU module each time arbitrary data portions, which are equivalent to the receive end
data quantity, are received, and repeats this process.
■When data is received using Method 1 (combination (1-D, 1-E))
• C24 regards arbitrary data portions, which are equivalent to the 'method 1 dedicated receive end data quantity' specified for
combination of the received start frames, as valid data after a start frame has been received, and stores it in the receive
area. It then issues a read request to the CPU module.
• Any received data after data, which is equivalent to the 'method 1 dedicated receive end data quantity', has been received
up to the next start frame will be ignored. (Data will not be stored in the receive area.)
Receive data
Arbitrary data
First frame
For the received
data count
For the received
data count
: Reception start timing
: Receive complete timing (read timing)
Stored in the
reception area
Ignored
Stored in the
reception area
Receive data
First frame Arbitrary data First frame Arbitrary data
Receive data
For received data count
for format 1 only
For received data count
for format 1 only
Ignored Stored in the
reception area
Ignored Stored in the
reception area
: Reception start timing
: Receive complete timing (read timing)
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