Table Of Contents

TCP Open Connection (G Dataflow)

Last Modified: February 27, 2017

Opens a TCP network connection using a specified address and port or service name.

Use the TCP Close Connection node to close the connection.

Programming Patterns


The address with which you want to establish a connection. This address can be in IP dot notation or it can be a hostname. If you do not specify an address, LabVIEW establishes a connection to the local computer.


remote port or service name

The port or name of the service to which you want to establish a connection. If you specify a service name, LabVIEW queries the NI Service Locator for the port number that the server registered. If you wire a value of 0, LabVIEW returns an error. remote port or service name can accept a numeric or a string input.


timeout ms

Time, in milliseconds, that the node waits to complete before returning a timeout error. A value of -1 indicates to wait indefinitely.

Default: 60,000 ms (1 minute)


error in

Error conditions that occur before this node runs. The node responds to this input according to standard error behavior.

Default: No error


local port

The local connection port. Some servers allow connections to clients that use port numbers only within a specific range that is dependent on the server. If the value is 0, the operating system selects an unused port.

Default: 0


connection ID

A network connection refnum that uniquely identifies the connection. Use this value to refer to this connection in subsequent node calls.


error out

Error information. The node produces this output according to standard error behavior.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

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