216 Ethernet module User’s Manual
Appendix B Socket Service Command Table
B
• The socket service code (CMD) classes (1) to (3) have the following meanings.
Class (1) is module control, (2) is PC link protocol transmission, and (3) is socket
interface transmission.
• For a single EN311 module, it is not possible to request another class (1) command
while a class (1) command is executing. If such a request is issued, the command
issued later will be ignored. This is also true for class (2) commands.
• For a single EN311 module, when requesting a class (3) command, it is not possible to
request another class (3) command for a socket for which an instruction is executing. If
such a request is issued, the command issued later will be ignored.
• There are eight sockets, and each can independently accept and execute a class (3)
command.
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