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Using Socket Services with Socket Service Request Switches Section 6-2
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.
6-2-9 UDP/IP Communications Programming Example
The following programming example illustrates transferring 100 bytes of data
between an Ethernet Unit and a host computer using UDP/IP communica-
tions.
System Configuration The programming example uses the following system configuration.
MOV(21)
000003 000203
MOV(21)
MOV(21)
MOV(21)
SET
000003
RSET
000203
SET
000003
000203 151904
<>(305)
RSET
000003 000203 151904
MOV(21)
If the Receive Request Switch (CIO 151904) turns OFF
while the TCP Receiving Flag (CIO 000203) is OFF, the
contents of the response code (D30027) in the Socket
Service Parameter Area is checked, and if it is not 0000
Hex (normal end), the TCP Receive Error Flag (CIO
000103) is turned ON.
After the execution results have been checked, the TCP
Receive Bit (CIO 000003) is turned OFF.
After the parameter has been set, the Receive Request
Switch (CIO 151904) is turned ON and the TCP Receiv-
ing Flag (CIO 000203) is turned OFF.
When the TCP Receiving Flag (CIO 000203) 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:
8203 E800 Hex =
Send/receive data address D01000
D30026: 0000 Hex = No timeout time.
END(01)
Continued from previous page.
#0001
D30018
#0064
D30023
#8203
D30024
#E800
D30025
#0000
D30026
151904
000203
000103
000003
D30027
#0000
Host computer
Ethernet Unit
IP address: 196.36.32.55
Port number: 4096
IP address: 196.36.32.101
Port number: 4096
PC