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Using Socket Services by Manipulating Dedicated Control Bits Section 6-7
TCP Receive
If the Send Request Switch (CIO 151903) turns OFF while
the TCP Sending Flag (CIO 000202) is OFF, the contents
of the response code (D30027) in the Socket Service Pa-
rameter Area is checked, and if it is not 0000 Hex (normal
end), the TCP Send Error Flag (CIO 000102) is turned ON.
After the execution results have been checked, the TCP
Send Bit (CIO 000002) is turned OFF.
After the parameters have been set, the Send Request
Switch (CIO 151903) is turned ON and the TCP Sending
Flag (CIO 000202) is turned OFF.
When the TCP Sending Flag (CIO 000202) turns ON, the
following parameters are written to the parameter area for
socket number 1.
D30018: 0001 Hex = UDP/TCP socket No. 1
D30023: 0064 Hex = No. of send/receive bytes is 100
D30024 and D30025:
8200 0000 Hex =
Send/receive data address D00000
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 pro-
cessing.
Continued from previous page.
MOV(21)
@RSET
000002
@SET
000002 000202
MOV(21)
MOV(21)
MOV(21)
SET
000002
RSET
000202
SET
000001 000201 151905
<>(305)
RSET
000001 000201 151905
@RSET
000003
@SET
@SET
000002 000202 151903
<>(305)
RSET
000002 000202 151903
Continued on next pa
g
e.
D30027
#0000
000101
000001
000102
000202
#0001
D30018
#0064
D30023
#8200
D30024
#0000
D30025
151903
000202
000102
000002
000103
000203
D30027
#0000
=(300)
&100
D30001
150913
When the TCP Receive Bit (CIO 000003) turns ON, the
TCP Receive Error Flag (CIO 000103) is turned OFF and
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.