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Using Socket Services with CMND(490) Section 6-8
Programming Example
If the Port Enabled Flag (A20200) turns ON and the Clos-
ing Flag (CIO 150903) turns OFF while the TCP Closing
Flag (CIO 000201) is OFF, checks are made and if any of
the following are true, the TCP Close Error Flag (CIO
000101) is turned ON.
The Results Storage Error Flag (CIO 150914) is ON.
The contents of the Response Storage Area set in the
command code (D01050) is not 0000 Hex (normal end).
The Network Communications Error Flag (A21900) is ON.
After the execution results have been checked, the TCP
Close Bit (CIO 000001) is turned OFF.
When the TCP Closing Flag (CIO 000201) turns ON, the
status of the Port Enabled Flag (A20200) is checked to be
sure it is ON and a TCP CLOSE REQUEST command is
sent using CMND(490).
D01030: First command word
D01040: First response word
D00010: First control data word
The TCP Closing Flag (CIO 000201) is also turned OFF.
TCP Close
When the TCP Close Bit (CIO 000001) turns ON, the TCP
Close Error Flag (CIO 000101) is turned OFF and the TCP
Closing Flag (CIO 000201) is turned ON to initialize pro-
cessing.
If the Port Enabled Flag (A20200) turns ON and the Open-
ing Flag (CIO 150900) turns OFF while the TCP Opening
Flag (CIO 000200) is OFF, checks are made and if any of
the following are true, the TCP Open Error Flag (CIO
000100) is turned ON.
The Results Storage Error Flag (CIO 150914) is ON.
The contents of the Response Storage Area set in the
command code (D01020) is not 0000 Hex (normal end).
The Network Communications Error Flag (A21900) is ON.
After the execution results have been checked, the TCP
Open Bit (CIO 000000) is turned OFF.
When the TCP Opening Flag (CIO 000200) turns ON, the
status of the Port Enabled Flag (A20200) is checked to be
sure it is ON and a PASSIVE TCP OPEN REQUEST com-
mand is sent using CMND(490).
D01000: First command word
D01010: First response word
D00000: First control data word
The TCP Opening Flag (CIO 000200) is also turned OFF.
TCP Passive Open
When the TCP Open Bit (CIO 000000) turns ON, the TCP
Open Error Flag (CIO 000100) is turned OFF and the TCP
Opening Flag (CIO 000200) is turned ON to initialize pro-
cessing.
Continued on next page.
000200
CMND(490)
@RSET
000000
@SET
000000 000200 A20200
RSET
SET
000000 A20200 150900 150914
<>(305)
A021900
000200
RSET
000000 A20200 150900
000201
CMND(490)
@RSET
000001
@SET
000001 000201 A20200
RSET
SET
000001 A20200 150903 150914
<>(305)
A21900
000201
RSET
000001 A20200 150903
000100
000200
D01000
D01010
D00000
000200
000100
000000
000101
000201
D01030
D01040
D00010
000201
000101
D01050
#0000
000001
D01020
#0000