6F8C0904 101
6.3 Socket Interface Information
6
Important note
This area is a read-only area. Do not attempt to write data to it using the MWRITE
instruction. If you do, data may no longer be read correctly.
TCP connection established
A socket status in which neither AOPEN or POPEN is set to 1 indicates that the socket is
in the closed state.
Table 6-2 Condition of Socket status bits
Bit no. Bit
Condition under which the bit is set
to 1
Condition under which the bit is
reset to 0
F TCP
TCP used by the socket The socket closed in response
to a close request
E UDP
UDP used by the socket The socket closed in response
to a close request
D AOPEN
TCP socket in active open state The socket closed in response
to a close request
C POPEN
TCP socket in passive open
state or UDP socket in open
state
The socket closed in response
to a close request
B CONN
Disconnected by the local node
with a close request
Disconnected by the remote
node
A RCV
Received text present No received text
9 RCLOSE
An established TCP connection
disconnected by the remote
node
The socket closed in response
to a close request
8 NOACK
No response received from the
remote node for a local node
send operation in a state where
a TCP connection was
established, and the TCP
resend function resulted in a
timeout (because the remote
node was down, etc.).
When the socket closed in
response to a close request:
When the wait time exceeds the
set value during a TCP active
open request:
This bit is not set to 1 for a TCP
passive open request timeout.
When a TCP active open
request is reissued.
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