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Using Socket Services with CMND(490) Section 6-8
Note When using the above programming example, change the bit and word
addresses as necessary to avoid using the same areas used by other parts of
the user program or the CPU Bus Unit.
When the TCP Receiving Flag (CIO 000203) turns ON,
the status of the Port Enabled Flag (A20200) is checked
to be sure it is ON and a TCP RECEIVE REQUEST
command is sent using CMND(490).
D04000: First command word
D04010: First response word
D00030: First control data word
The TCP Receiving Flag (CIO 000203) is also turned
OFF.
TCP Receive
When the TCP Sending Flag (CIO 000202) turns ON,
the status of the Port Enabled Flag (A20200) is checked
to be sure it is ON and a TCP SEND REQUEST com-
mand is sent using CMND(490).
D02000: First command word
D03000: First response word
D00020: First control data word
The TCP Sending Flag (CIO 000202) is also turned
OFF.
TCP Send
When the TCP Send Bit (CIO 000002) turns ON, the
TCP Send Error Flag (CIO 000102) is turned OFF and
the TCP Sending Flag (CIO 000202) is turned ON to
initialize processing.
Continued from previous page.
If the Port Enabled Flag (A20200) turns ON and the
Sending Flag (CIO 150902) turns OFF while the TCP
Sending Flag (CIO 000202) is OFF, checks are made
and if any of the following are true, the TCP Send Error
Flag (CIO 000102) is turned ON.
The Results Storage Error Flag (CIO 150914) is ON.
The contents of the Response Storage Area set in the
command code (D03010) is not 0000 Hex (normal end).
The Network Communications Error Flag (A21900) is
ON.
After the execution results have been checked, the TCP
Send Bit (CIO 000002) is turned OFF.
If the Port Enabled Flag (A20200) turns ON and the Re-
ceiving Flag (CIO 150901) turns OFF while the TCP Re-
ceiving Flag (CIO 000203) is OFF, checks are made and if
any of the following are true, the TCP Receive Error Flag
(CIO 000103) is turned ON.
The Results Storage Error Flag (CIO 150914) is ON.
The contents of the Response Storage Area set in the
command code (D04020) is not 0000 Hex (normal end).
The Network Communications Error Flag (A21900) is ON.
After the execution results have been checked, the TCP
Receive Bit (CIO 000003) is turned OFF.
000202
CMND(490)
@RSET
000002
@SET
000002 000202 A20200
RSET
SET
000002 A20200 150902 150914
<>(305)
A21900
000202
RSET
000002 A20200 150902
000203
CMND(490)
@RSET
000003
@SET
000003 000203 A20200
RSET
SET
000003 A20200 150901 150914
<>(305)
A21900
000203
RSET
000003 A20200 150901
END(001)
D04020
#0000
000003
000103
000203
D04000
D04010
D00030
000203
000103
000002
#0000
D03010
000102
000202
D02000
D03000
D00020
000202
000102
=(300)
&100
D30001
150913
When the TCP Receive Bit (CIO 000003) turns ON, the
TCP Receive Error Flag (CIO 000103) is turned OFF.
The contents of the reception buffer, and the status of the
TCP Data Received/Requested Flag (CIO 150913), and
the Number of Bytes Received at TCP Socket (D30001)
are checked. If the data is stored in the buffer, the TCP
Receiving Flag (CIO 000203) turns ON.