Passive Tcp Open Request - Omron CS1W-ETN01 Operation Manuals

Command/Response Reference
11-3-13

PASSIVE TCP OPEN REQUEST

Command Block
27 10
Command TCP
code socket
number
Response Block
Results Storage Format
Parameters
TCP Socket Number
(Command)
Results Storage Area
(Command)
Local TCP Port Number
(Command, Results
Storage Area)
Timeout Value (Command)
Remote IP Address
(Command, Results
Storage Area)
Remote Port Number
(Command, Results
Storage Area)
Precautions
204
Requests processing to open a TCP socket. The socket will wait to be connected
to another node.
Results storage area Local
TCP
port
number
27 10
Command Response
code code
Response Remote IP
code address
The TCP socket number to be opened specified as 2 bytes between 1 and 8.
The area in which the results of the command execution are stored. The first byte
specifies the memory area and data type (variable type). The 2nd to 4th bytes
specify the beginning address of the results storage area. Refer to page 192 for
details about the variable types and addresses that can be specified.
The TCP port number for communications with the socket is specified as 2 bytes
(0 cannot be specified). Do not specify the port number of the FTP server (port
#21).
The maximum control time between receiving the open request and storing the
result. If this set time limit is exceeded, the code for a timeout error will be set as
the results storage response code. The value is set in units of 0.1 s. The timeout
time is unlimited if the value is set to 0.
Specify the remote node's IP address. If all zeroes are set, no remote node is
specified and connection is awaited from any node. If any other value is set, con-
nection is awaited from the specified remote node. The IP address of the con-
nected remote node will be stored in the results storage area.
Specify the remote TCP port number with this command. If all zeroes are set, no
remote TCP port number is specified. If any other value is set, it specifies the
TCP port number of the remote node. The TCP port number of the connected
remote node will be stored in the results storage area.
Processing varies as shown in the table below according to the specified com-
bination of remote IP address and remote TCP port number.
Remote IP Remote TCP
address
0 0
0 Not 0
Not 0 0
Not 0 Not 0
Remote IP
Timeout
address
value
Remote port
number
port
All connection requests received
Received only when port number matches.
Received only when IP address matches.
Received only when IP address and port
number matches.
Section 11-3
Remote TCP
port number
Description