108 Ethernet module User’s Manual
Chapter 6 Socket Interface Communication
6
Since the send/receive processing for each socket requires about 50 ms, applications
that issue send or receive requests to a given socket should leave an interval of at
least 50 ms times the number of sockets used between each request.
Interval between send (receive)requests to the same socket >= Number of
sockets used ¥ 50 ms
Similarly, the above intervals averaging 50 ms should be left between transmissions
from remote nodes to the local node.
Interval between remote node transmissions >= Number of remote nodes ¥ 50
ms
(6) When multiple sockets send the data to the EN311 socket
• If you give a specific value to "transmission source IP address" and "transmission
source object socket UDP port number", the EN311 checks the "transmission source
IP address" and "transmission source object socket UDP port number" of the data
received on the socket. If the received data has different "transmission source IP
address" and "transmission source object socket UDP port number", the data will not
be transferred to the S controller.
• If there are three received data packets on the EN311 UDP socket (assuming all of the
source sockets are different) and the specified "transmission source IP address" and
"transmission source object socket UDP port number" match with the third received
data packet, the third data packet will be transferred to the S controller but the first and
the second will be discarded.
• To prevent the checking of the source IP address against the received data, set the
source IP address to "0.0.0.0".
• To prevent the checking of the source object socket UDP port number against the
received data, set the source object socket UDP port number to "0".
(7) Broadcast reception
It is possible to broadcast to all nodes on the network using UDP sockets.
Receive side:Specify the transmission source IP address to be "0.0.0.0".
Specify the transmission source UDP port number to be the UDP port number of
broadcast transmitting socket.
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