118 Ethernet module User’s Manual
Chapter 6 Socket Interface Communication
6
• Every bit of the socket becomes "0" when the TCP close request is completed.
• The internal completion wait time limit of the S controller for this request is 15 seconds.
If the EN311 was not able to reply the completion within this time limit, the following
error is returned.
Error status: Send completion timeout ••• 5002(16#EC76)
In this case, first verify that the module is not in the down state by checking the station
status, and then verify the open/closed state of the socket with the socket status.
When ending the connection from the EN311
• The EN311 which has received the close request of the S controller waits 10 seconds
after sending the end request to the remote station waits for the end request (TCP
level) of the remote station side.
• If there is the end request of the remote station side during the wait time, the EN311
performs the own-station close processing.
• If the wait time is up, the EN311 performs the own-station close processing.
• The open request should be issued after waiting at least 20 seconds to open again
with the same port number even the S controller completed the close request. If the
open request is issued within 20 seconds using the same port number, the following
error is returned.
Error status: Already open •••2944(16#B80) or
Error status: LAN controller driver error ••• 2960(16#B90)/2962(16#B92)
• When the remote station sends the end request after more than 10 seconds have
elapsed since the EN311 sent the end request to the remote station, the EN311
responds with "Reset packet (the TCP packet with it's reset bit is set to ON): Used to
force the disconnection".
When ending the connection from the remote
• When ending the connection form the remote station, the local station should also
close the socket. User programs should monitor the RCLOSE and CONN bits in the
socket status (see section 6.3, "Socket Interface Information"). RCLOSE is set to 1
and CONN is set to 0 when a close request is received from the remote station.
• When ending the connection form the remote station, the open request should be
issued after waiting at least 10 seconds to open again with the same port number even
the S controller completed the close request.
If the open request is issued within 10 seconds using the same port number, the
following error is returned.
Error status: LAN controller driver error ••• 2960(16#B90)/2962(16#B92)
To Next Page
Loading...
