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6-3
Section
Using Socket Services with CMND(490)
132
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 Receive Bit (CIO 000003) turns ON, the
TCP Receive Error Flag (CIO 000103) is turned OFF
and the TCP Receiving Flag (CIO 000203) is turned ON
to initialize processing.
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)
D02000
D03000
D00020
@RSET
000102
000002
@SET
000202
000002
000202
A020200
RSET
000202
SET
000102
000002
A20200
150102
150114
<>(305)
D03010
#0000
A021900
000202
RSET
000002
000002
A20200
150102
000203
CMND(490)
D04000
D04010
D00030
@RSET
000103
000003
@SET
000203
000003
000203
A020200
RSET
000203
SET
000103
000003
A020200
150101
150114
<>(305)
D4020
#0000
A021900
000203
RSET
000003
000003
A20200
150101
END(001)