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6 F 3 B 0 3 6 2
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 TCP connection established
Disconnected by the local port with a close request
Disconnected by the remote port
A RCV Received text present No received text
9 RCLOSE
An established TCP connection disconnected
by the remote port
The socket closed in response to a close request
8 NOACK
No response received from the remote port for
a local port send operation in a state where a
TCP connection was established, and the TCP
resend function resulted in a timeout (because
the remote port was down, etc.).
The socket closed in response to a close request
If 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.
A socket status in which neither AOPEN nor POPEN is set to 1 indicates that the socket is in the
closed state.
Important items
This area is a read-only area. Do not attempt to write this data with the WRITE instruction. It will
no longer be possible to acquire correct data after such an operation.
Sample: Socket interface information readout program
| |
|R0000 |
1|-| |-[03907 MOV RW010][00005 MOV RW011][H00FE READ RW010 -> D1000]--|
| |
READ instruction description
H00FE: Module designation. The Ethernet Port must specify H00FE.
RW010: Specifies the start address of the socket status information.
If 03907 (0F4BH) is specified, the socket status information for
socket 1 will be read out.
RW011: Specifies the number of words (00005) to be read out.
D1000: Specifies the starting address of the area to hold the read out socket
status information.
In this case, the read out downloaded information is stored at locations
D1000 to D1004.
Setting R0000 to 1 will store the socket status information for socket
1 at locations D1000 to D1004.