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Table 4.2 Instructions (Requests) to the Ethernet Port (Part 2)
Request Function Instruction CMD
TCP open request Opens a socket interface (TCP). SEND 0035H
TCP send request Sends data from a socket interface in the TCP open state. SEND 0037H
TCP receive request Reads data received by a socket interface in the TCP open
state.
RECV 0038H
TCP close request Closes (terminates) a socket interface in the TCP open state. SEND 0039H
CMD (command number): Indicates the request type to the Ethernet Port.
<Important items>
f. Items ¬ to ® are CMD classes. Class ¬ is Ethernet Port control, - is PC link protocol
transmission, and ® is socket interface transmission.
• For a single Ethernet Port, it is not possible to request another class ¬ CMD while a
class ¬ CMD is executing. This is also true for class - CMDs. If such a request is
issued, the status (described in the following status information) will be transmission port
busy, and the request will go to the wait state.
• For a single Ethernet Port, when requesting a class ® CMD, it is not possible to request
another class ® command for a socket for which an instruction is executing. If such a
request is issued, the status (described in the following status) will be transmission port
busy, and the request will go to the wait state.
• There are eight sockets, and each can independently accept and execute a class ®
instruction.
g. If the T2N switches from the run to the halt state and then back to the run state while an
instruction is executing, it is possible that the Ethernet Port could execute the request issued
immediately prior to the halt state. This section describes the handling required after
returning to the run state.
• The T2N should always set the Ethernet Port to standby mode after the T2N returns to
run mode. (See 4.5.) Setting the Ethernet Port to standby mode causes all the requests
issued to the Ethernet Port to be discarded, computer link and PC link protocol
transmissions to be stopped, and the socket interface to be initialized, i.e. set to the
closed state.
• Before setting the Ethernet Port to standby mode, verify the operating mode (See 4.5.)
with the Ethernet Port station status. (See section 7.1.) If the Ethernet Port is in run
mode, set it to standby mode. However, if it is in standby mode, there is no need to set it
to standby mode again.
®