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c. Receive request
START
Resolve the problem by referring
to the status.
Transmit a message at the
remote port.
Verify the status using the
procedure described in the item
3 " If a SEND or RECV
instruction fails complete" on
page 148.
No
Did the RECV instruction
complete?
Yes
No
Was the wait time set to
unlimited?
Yes
Set the Ethernet Port to run +
socket transmission enabled
using an operating mode control
request.
No
¬
¬
Did the instruction time out?
TermSTS = 0BH
Details = 0020H
Yes
No
Is the station status such that
run + socket transmission is
enabled?
Yes
Open UDP ports on the local
port.
No
Is the local port open?
Yes
No
Is the remote port
transmitting?
Yes
Verify the remote port IP address and UDP port
number.
No
Are the remote port IP
address and UDP port
number correct?
Yes
1. Recheck the remote port IP address and
message transmission UDP port numbers.
2. Verify that there is no router on the network.
3. Check the network verification items.
No
Does a response come back
if a ping is issued to the
remote port?
Yes
RAS error counters: Alignment error
Short packet
CRC error
It is possible that there is an abnormality on the
network itself. Check the network verification
items.
No
Is the error counter read out
from the RAS information
constant (i.e., not being
incremented)?
(Use RAS information
readout to determine this.)
END
Yes