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7.1.3 Sending Format in General-Purpose Communication
Difference in operation based on selection of communication types
• Data to be sent/received in LAN communication vary based on settings for user connection
information: communication type.
Communication
type
Setting
Attach a dedicated
header
Do not attach a
dedicated header
Sent message format for general-purpose communication
When "Attach a dedicated header" is selected for communication type, a header as shown
below is attached to the sent message.
Data size (H)
Connection No. of sender
Sent Data Part
REFERENCE
For details of setting screen for communication type, see 3.6 Setting of User
•
Connection.
Maximum no.
Message
of bytes
type
for sent data
A header is
attached to
Within 16,384
the message
bytes
before
sending.
A header is
not attached
Within 8,192
to the
bytes
message.
10 H
00 H
Data size (L)
02 H
00 H
02 H
00 H
00 H
00 H
00 H
7.1 Operation of General-Purpose Communication
Receiving operation
The receiving process is
completed when data
that correspond to the
No. of sent bytes as
indicated in the header
have been received.
The receiving process is
completed when there is
no more received data
exceeding the TCP
terminal detection timer
value (default: 20 ms).
Setting method
Select this when
general-purpose
communication is
not executed with
the FP2 ET-LAN
unit.
Select this when
general-purpose
communication is
executed with the
FP2 ET-LAN unit, or
communication
without a dedicated
header is desired.
7-3
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